Abstract
We propose a tunable all-dielectric zero-index metamaterial based on phase change material. By constructing the alternating rod structure with phase change material and silica material, the zero-refractive index characteristic is realized. In order to verify the equivalent zero-index characteristic, we calculated the electromagnetic field distribution at center frequency. Based on phase invariance, it was found that this kind of metamaterial can achieve equivalent zero refractive index characteristics. To further achieve the polarization-insensitive zero refractive index, we propose a metamaterial structure based on the fishing nets structure. Based on the S-parameter inversion algorithm, the equivalent dielectric constant, equivalent permeability, equivalent impedance, and equivalent refractive index of the metamaterial were extracted. Based on the extracted equivalent parameters and the corresponding electromagnetic field distribution, the designed all-dielectric metamaterial has the tunable equivalent zero refractive index characteristic.
1 Introduction
Metamaterial is a kind of artificial electromagnetic material, which affects electromagnetic wave transmission mainly by characterizing different geometric parameters [1,2,3,4,5,6,7,8,9,10]. Compared with traditional materials, metamaterials have unit structures that are smaller than the wavelength size [11,12,13,14,15,16,17,18]. Through periodic or aperiodic arrangement and combination of cell structures, metamaterials have exotic physical properties that are not found in natural materials [19,20,21,22,23,24,25,26,27,28]. Metamaterials may achieve 0–1 or negative equivalent refractive index, permittivity ɛ, permeability μ, etc. Metamaterials can realize special phenomena such as deflection of light in any direction and inverse Doppler effect. Metamaterials are widely used in communication, absorber, antenna, lens, filter, and other fields [29,30,31,32,33,34,35,36,37,38,39,40].
Zero-index metamaterials (ZIM) have been a hot topic in the research of artificial electromagnetic metamaterials. Spatially continuous zero index can be achieved across a bulk metal near the plasma frequency [41,42,43]. Distinct from the spatially continuous zero index, macroscopic zero index materials can be realized by traditional metamaterials such as fishnet metamaterial [44], or by doping an zero index medium with dielectric dopants [45,46,47], or in all-dielectric metamaterials supporting a Dirac-like cone dispersion at the center of the Brillouin zone [48,49,50]. The traditional ZIM structures typically originate from metallic thin wire array and metallic resonators array [51]. The metallic wire array is used to reduce the plasma frequency to the desired zero index frequency while the metallic resonators array was used to achieve a magnetic resonance [52], leading to a zero permeability at the magnetic plasma frequency [53]. ZIMs can be achieved by engineering a typical traditional metamaterial as a metal-dielectric-metal fishnet structure [54]. Different from fishnet metamaterials, all dielectric ZIMs can be realized via purely dielectric structures, avoiding the ohmic losses [55].
ZIMs have many unique physical properties, such as wavelength stretching effect, phase consistency effect, tunneling effect, and defect regulation effect [56]. According to its electromagnetic response characteristics, it can be further subdivided into zero dielectric constant material, zero permeability material, and double zero material. The promising potential applications of ZIMs have been demonstrated in electromagnetic waveguides, free-space wave manipulation, metrology, nonlinear optics, lasers, and quantum optics [55]. At present, most zero-refractive index metamaterials are constructed by metal materials. The ohmic loss of metal materials seriously affects the efficiency and characteristics of metamaterial devices. In addition, the existing all-dielectric type ZIMs are not tunable. Once prepared and designed, their properties are fixed. Here, we propose a tunable all-dielectric ZIM using phase change material.
2 Alternating rod structures metamaterials
GeSbTe (GST) phase change material is composed of germanium (Ge), antimony (Sb), and tellurium (Te). Common ones are Ge2Sb2Te5 (GST-225) and Ge3Sb2Te6 (GST-326). We mainly construct zero-refractive index metamaterial using typical GST-225 material. According to the different crystal structures, phase change material GST can be divided into two phase states, c-GST (crystalline state) and a-GST (amorphous state). The conversion between crystalline GST and amorphous GST can be realized by heating, pulsed laser irradiation, applied voltage, and other means. The phase transition from a-GST (amorphous) to c-GST (crystalline) is as follows: when the temperature of a-GST exceeds the crystallization temperature (about 160°C), the crystal structure will first change to face-centered cubic (metastable) and then from face-centered cubic to hexagonal (stable), resulting in c-GST. The transformation process from c-GST (crystalline) to a-GST (amorphous) is to melt c-GST by heating it beyond its melting point (about 640°C), and then to form a-GST after rapid cooling and solidification within 10 ns. Once the cooling and solidification time is too long, the liquid GST will still recombine into c-GST (crystal) structure. Because of the demanding cooling time, the phase transition is often achieved by irradiation of short pulse laser with pulse width less than 10 ns. When the phase transition of GST is completed, the crystal structure can be maintained at room temperature for a long time, which is called non-volatile property.
Based on the alternating rod structure, all-dielectric zero-refractive index metamaterials can be constructed, as shown in Figure 1. The designed ZIM consists of silica and GST phase change material. Four layers of GST phase change material are separated by three layers of silica and constitute a total structure of seven layers. The superstructure consists of microscopic units composed of alternating SiO2 (

Schematic diagram of alternate rod structure. The structural parameters of ZIM are of the period A = 1,200 nm, rod width W = 520 nm, GST layer thickness T 1 = 520 nm, SiO2 layer thickness T 2 = 680 nm.
Using the finite integral method, we calculated the S parameter of the designed metamaterial structure, as shown in Figure 2. It can be seen from Figure 2 that the metamaterial structure obtains the transmission passband at about 5.2 µm under the TE wave and about 7.7 µm under the TM wave. We defined TE waves as electric field vectors parallel to the Y-axis and TM waves as electric field vectors perpendicular to the Y-axis. For different incidence angles, the transmittance of ZIM will significantly change, as shown in Figure 2(c). The transmission of ZIM shows a nonlinear change when the mid-infrared light at 7.7 µm is incident at different angles, where zero degree means incident light perpendicular to the metamaterial surface. It can be seen that high transmittance can be maintained within 0–20° of deviation from vertical incidence. However, the transmittance drops sharply when it deviates from the vertical incidence of 20–40° and is very low between 40 and 90°, which conforms the transmittance characteristics of zero-refractive index materials.

(a) S parameter of alternating rod structure for TE wave, (b) S parameter of alternating rod structure for TM wave, and (c) transmittance at different incidence angles (incident wavelength is 7.7 µm).
Based on the effective medium theory, the S parameter of metamaterial is calculated. Based on the inversion algorithm, the equivalent refractive index n, equivalent permeability, equivalent dielectric constant, and equivalent impedance of the metamaterial can be obtained as shown in Figure 3. The S-parameter inversion method is the process of solving the equivalent refractive index n and the equivalent impedance Z of the metamaterials structure using the transmission matrix of the equivalent model and the S parameters [57–59]. According to the inversion results of equivalent electromagnetic parameters, zero refractive index can be obtained for metamaterials with alternating rod structure at TM wave from 7.06 to 7.73 µm. When zero refractive index is obtained, zero equivalent impedance is also obtained, and the equivalent permittivity and permeability are close to zero in the near-zero refractive index band, indicating that the ZIM structure is more stable than the ZIM structure whose equivalent dielectric constant and permeability approach zero alone. Since the phase of light is the same in the ZIMs, it appears that the wavelength of the sinusoidal field is stretched to infinity and the phase propagates instantly. This property allows light to be controlled in an unprecedented way within a very small available space on an optical chip. It can pass through extremely narrow channels or waveguides, bypassing sharp corners without losing energy. Fabrication of such metamaterials on a chip can be integrated with other nanofabrication technologies for on-chip optical manipulation. If we put a ZIM into a waveguide made of mirrors, we can achieve efficient transmission regardless of the length, extrusion, shape, distortion, or bending of the waveguide, phenomena that cannot be achieved in microwave and optical systems by using conventional waveguides.



Inversion results of equivalent electromagnetic parameters of alternating rod structures: (a) TM wave equivalent refractive index; (b) TM wave equivalent permeability; (c) TM wave equivalent dielectric constant; (d) TM wave equivalent impedance; (e) TE wave equivalent refractive index; (f) TE wave equivalent permeability; (g) TE wave equivalent dielectric constant; and (h) TE wave equivalent impedance.
The zero refractive index of ZIM can be obtained at TE wave from 5.1 to 5.3 µm. By comparing the equivalent electromagnetic parameters of ZIM under TE wave and TM wave, it can be found that the refraction index of TM wave and TE wave of the ZIM structure is different, which makes the ZIM as a zero-refractive index material have requirements on the incident light mode. In order to solve this problem, two other ZIM structures that can obtain the same electromagnetic parameters for TM/TE are proposed.
The structural parameters play a decisive role in the equivalent refractive index of ZIM, and the structural parameters cannot be changed after the manufacture of ZIM. The influence of bar width and the number of layers of ZIM structure is the most obvious and easy to be modified. When other structural parameters are the same, the layers of ZIM structure are designed as three layers (two layers of GST phase change material separated by one layer of silica), five layers (three layers of GST phase change material separated by two layers of silica), seven layers (four layers of GST phase change material separated by three layers of silica), and nine layers (five layers of GST phase change material separated by four layers of silica), respectively. Figure 4(a) shows the effect of different layers on the equivalent refractive index of the ZIM. The equivalent zero refractive index of ZIM gradually moves towards short wave with the decrease of the number of layers, and the equivalent zero refractive index band length also widens gradually. In the case of few layers, zero refractive index characteristics cannot be obtained. By comparing the resonant frequencies and stability of different layers, the 7-layer ZIM structure is finally optimized as the optimal zero-refractive index metamaterial. The equivalent refractive index of ZIM will also change with the change of rod width W. When other structural parameters are the same, the rod width W increases from 400 to 700 nm by 60 nm each time. It can be found that the equivalent refractive index of ZIM also changes with the change of W. As shown in Figure 4(b), when W increases, the equivalent zero refractive index of ZIM moves toward the long-wave direction, but its equivalent zero refractive index bandwidth remains basically unchanged. When W = 400 nm, the equivalent zero index band is 6,550–7,150 nm, and when W = 700 nm, the equivalent zero index band is 7,750–8,650 nm. Rod width W of 520 nm was selected as the optimal design value.

(a) Influence of different layers on refractive index. (b) Influence of different rod width W on refractive index.
To further explore the physical mechanism of zero-refractive index metamaterials, the electromagnetic field distribution and phase distribution when electromagnetic waves pass through the metamaterials were calculated, as shown in Figure 5. When the incident wavelength is 5.2 µm, the phase consistency effect can be found by observing the phase and intensity distribution. When the structure is equivalent to a homogeneous medium, the phase of the wave can be regarded as unchanged as it passes through the interior of the medium.

(a) Electric field distribution (vertical X-axis section) and (b) phase distribution (vertical X-axis section).
In general, the equivalent refractive index is determined by the structural parameters of the microstructure and the refractive index of the material. Obviously, the equivalent refractive index cannot be changed easily after the structural parameters are determined. Changing the refractive index of materials is a better choice for optical control. We introduce phase change material GST, which provides the possibility to artificially regulate the equivalent refractive index. As a phase change material, the refractive index of GST can be changed greatly. Optical regulation can be realized by using its characteristics. The center frequency of the equivalent zero refractive index of ZIM can be adjusted by changing the refractive index of GST material. As shown in Figure 6, when the refractive index of GST material changes from 3 to 6, the center frequency of the equivalent zero refractive index of ZIM can redshift, and the zero refractive index bandwidth gradually widens. In practical applications, the refractive index of GST materials can be adjusted by external stimulation, so as to regulate the frequency range of the equivalent zero refractive index of metamaterial.

ZIM equivalent refractive index n of alternating rod structures with different refractive indexes of GST material.
3 Metamaterial with alternating cross-structure
To solve the problem that alternating rod ZIM have different electromagnetic parameters for different modes, we further proposed an all-dielectric zero-refractive index metamaterial based on alternating cross structure, as shown in Figure 7. Alternating cross ZIM consists of silica and GST phase change material. Four layers of GST phase change material are separated by three layers of silica. The thickness of the silica layer is 680 nm, and the thickness of the GST material layer is 520 nm. The structure is filled with air. The corresponding S parameters and transmission characteristics are shown in Figure 8.

Schematic diagram of alternating cross structure. ZIM structure parameters are width W = 520 nm, GST layer thickness T 1 = 680 nm, SiO2 layer thickness T 2 = 520 nm.

(a) S parameter of TE/TM wave with alternating cross structure and (b) transmittance at different incidence angles (incident wavelength 8.3 µm).
Figure 9 shows the equivalent parameters of the metamaterial structure calculated based on the S-parameter inversion algorithm. According to the equivalent electromagnetic parameters, the zero refractive index of alternating cross ZIM can be obtained at TE/TM waves from 7.5 to 8.3 µm. Zero refractive index and zero equivalent impedance are obtained. In the near-zero refractive index band, the equivalent permittivity and permeability are close to zero, indicating that the structure is more superior than the structure where one of the equivalent permittivity and permeability approaches zero alone. Compared with the alternating rod ZIM, the zero index band of the alternating cross type is slightly inclined to the long wave under the same structural parameters, and the zero index bandwidth is also wider.

Inversion results of equivalent electromagnetic parameters of alternating cross structures. (a) Refractive index n of TE/TM wave; (b) permeability of TE/TM wave μ; (c) dielectric constant ε of TE/TM wave; and (d) impedance z of TE/TM wave.
For the alternating cross structure, the equivalent refractive index of ZIM can be changed mainly by changing the width W. When other structural parameters are the same, the rod width W increases by 60 nm from 400 to 700 nm. It can be found that the equivalent refractive index of ZIM also changes with the change of W, as shown in Figure 10. When W increases, the zero-equivalent refractive index band of ZIM moves towards the long wave direction. The equivalent zero refractive index frequency point of ZIM can be adjusted by changing the refractive index of GST material, as shown in Figure 11. When the refractive index of GST material increases from 3 to 6, the equivalent zero refractive index frequency of ZIM shows the redshift, and the zero refractive index bandwidth gradually widens. When the refractive index of GST material is 3, the zero refractive index can be obtained in the range from 7.5 to 8.3 µm. When the refractive index of GST material is 6, the zero refractive index can be obtained in the range from 13.0 to 14.9 µm. In practical applications, the central frequency of the equivalent refractive index can be adjusted by adjusting the degree of crystallization of GST material.

Effect of different width W on refractive index.

The equivalent refractive index n of an alternating cross structure with different refractive indexes of GST material.
4 Alternating square structure zero-refractive index metamaterial
We further propose metamaterials with alternating square structures to achieve narrow-band zero refractive index characteristics as shown in Figure 12. The alternating square ZIM is still composed of silica with GST phase change material, which is separated by silica. The metamaterial structure consists of 7 alternating layers of SiO2 (thickness 680 nm) and GST phase change material (thickness 520 nm). The corresponding S parameter is shown in Figure 13(a). Figure 13(b) shows transmission coefficients at different incident angles. Based on the S-parameter inversion algorithm, we calculated the equivalent parameters of this metamaterial structure, which are shown in Figure 14. For the alternating square structure, the equivalent zero refractive index frequency of ZIM can be changed mainly by changing the width W as shown in Figure 15. The equivalent zero refractive index frequency range of ZIM can be adjusted by changing the refractive index of GST material, as shown in Figure 16. When the refractive index of GST material changes from 3 to 6, the equivalent zero refractive index of ZIM appears redshift, and the zero refractive index bandwidth gradually widens. In practice, the frequency range of the equivalent refractive index can be regulated by adjusting the degree of crystallization of GST materials.

Schematic diagram of alternating square structure.

(a) S parameter of TE/TM wave with alternating square structure and (b) transmission coefficient at different incidence angles (incident wavelength 4.8 µm).

Equivalent electromagnetic parameters of alternating square structures: (a) refractive index n, (b) permeability μ, (c) permittivity ε, and (d) impedance z of TE and TM waves.

Effect of different width W on refractive index.

ZIM equivalent refractive index n of alternating square structure with different refractive indices of GST material.
In order to clearly show the creative results different from the reported works, Table 1 shows the comparison of our results with the existing ones.
Comparison of our work with others
| Materials | Incidence | Structure | Dimension | Tunable | References |
|---|---|---|---|---|---|
| Metal | Out of plane | Bulk metal | 2D | No | [41] |
| Metal | Out of plane | Bulk metal | 2D | No | [42] |
| Metal | Out of plane | Bulk metal | 2D | No | [43] |
| Metal and dielectric | Out of plane | fishnet | 3D | No | [44] |
| Metal and dielectric | Out of plane | Multi-layer | 3D | No | [60] |
| Metal and dielectric | In plane | Double mirror | 3D | No | [61] |
| All dielectric | Out of plane | Silicon Pillars | 3D | No | [48] |
| All dielectric | In plane | Silicon Pillars | 3D | No | [62] |
| All dielectric | In plane | CMOS air holes | 2D | No | [63] |
| All dielectric | In plane | Waveguide | 1D | No | [64] |
| All dielectric | In plane | Bound states in the continuum | 2D | No | [65] |
| All dielectric | Out of plane | GST pillars | 3D | Yes | Our work |
5 Conclusions
A tunable all-dielectric ZIM is designed, which can be used in the field of middle and far infrared light. By using the metamaterial with alternating rod-shaped structure of GST phase change material and silica material, the near-zero refractive index characteristics of broadband can be achieved. By using the characteristics of GST phase change material, the state of GST phase change material can be regulated by changing the external stimulus, so as to accurately regulate its refractive index. Then, the equivalent zero refractive index of the metamaterial can be regulated to obtain a wider zero refractive index band. Moreover, the alternating cross structure and alternating square structure are developed, both of which can meet the zero refractive index of TE wave and TM wave under the same wavelength condition.
Acknowledgments
The authors acknowledge the support from Natural Science Foundation of Zhejiang Province (Nos. LZ21A040003 and LY22F050001); National Natural Science Foundation of China (No. 62175224).
-
Funding information: The authors acknowledge the support from Natural Science Foundation of Zhejiang Province (Nos. LZ21A040003 and LY22F050001); National Natural Science Foundation of China (No. 62175224).
-
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
-
Conflict of interest: The authors state no conflict of interest.
References
[1] Zhu, W. G., M. J. Jiang, H. Y. Guan, J. H. Yu, H. H. Lu, J. Zhang, et al. Tunable spin splitting of Laguerre–Gaussian beams in graphene metamaterials . Photonics Research, Vol. 5, No. 6, 2017, pp. 684–688.10.1364/PRJ.5.000684Search in Google Scholar
[2] Jiang, M. J., W. G. Zhu, H. Y. Guan, J. H. Yu, H. H. Lu, J. Y. Tan, et al. Giant spin splitting induced by orbital angular momentum in an epsilon-near-zero metamaterial slab. Optics Letters, Vol. 42, No. 17, 2017, pp. 3259–3262.10.1364/OL.42.003259Search in Google Scholar PubMed
[3] Guan, H. Y., J. Y. Hong, X. L. Wang, J. Y. Ming, Z. L. Zhang, A. J. Liang, et al. Broadband, high-sensitivity graphene photodetector based on ferroelectric polarization of LiNbO3. Advanced Optical Materials, Vol. 9, No. 16, 2021, id. 2100245.10.1002/adom.202100245Search in Google Scholar
[4] He, P. H., L. Y. Niu, Y. Fan, H. C. Zhang, L. P. Zhang, D. Yao, et al. Active odd-mode-metachannel for single-conductor systems. Opto-Electronic Advances, Vol. 5, No. 8, 2022, id. 210119.10.29026/oea.2022.210119Search in Google Scholar
[5] Jeon, W. B., J. S. Moon, K. Y. Kim, Y. H. Ko, C. J. Richardson, E. Waks, et al. Plug-and-play single-photon devices with efficient fiber-quantum dot interface. Advanced Quantum Technologies, Vol. 5, No. 10, 2022, id. 2200022.10.1002/qute.202200022Search in Google Scholar
[6] He, X. Y., F. T. Lin, F. Liu, and W. Z. Shi. 3D Dirac semimetals supported tunable terahertz BIC metamaterials. Nanophotonics, Vol. 11, No. 21, 2022, pp. 4705–4714.10.1515/nanoph-2022-0285Search in Google Scholar
[7] Liu, K., J. Wu, Z. He, and L. Cao. 4K-DMDNet: diffraction model-driven network for 4K computer-generated holography. Opto-Electronic Advances, Vol. 6, No. 5, 2023, id. 220135.10.29026/oea.2023.220135Search in Google Scholar
[8] Leng, J., J. Peng, A. Jin, D. Cao, D. J. Liu, X. Y. He, et al. Investigation of terahertz high q-factor of all-dielectric metamaterials. Optics & Laser Technology, Vol. 146, 2021, id. 107570. 10.1016/j.optlastec.2021.107570Search in Google Scholar
[9] Lu, X. Q., X. Y. Zeng, H. R. Lu, Y. S. Han, Z. Mou, C. X. Liu, et al. Polarization controllable plasmonic focusing based on nanometer holes. Nanotechnology, Vol. 31, No. 13, 2020, id. 315203.10.1088/1361-6528/ab62d0Search in Google Scholar PubMed
[10] Paiva, I. L., R. Lenny, and E. Cohen. Geometric phases and the Sagnac effect: Foundational aspects and sensing applications. Advanced Quantum Technologies, Vol. 5, No. 2, 2022, id. 2100121.10.1002/qute.202100121Search in Google Scholar
[11] Zhang, Y., M. Pu, J. Jin, X. Lu, Y. Guo, J. Cai, et al. Crosstalk-free achromatic full Stokes imaging polarimetry metasurface enabled by polarization-dependent phase optimization. Opto-Electronic Advances, Vol. 5, No. 11, 2022, id. 220058.10.29026/oea.2022.220058Search in Google Scholar
[12] Wang, H., L. X. Liu, C. D. Zhou, J. L. Xu, M. N. Zhang, S. Y. Teng, et al. Vortex beam generation with variable topological charge based on a spiral slit. Nanophotonics, Vol. 8, No. 2, 2019, pp. 317–324.10.1515/nanoph-2018-0214Search in Google Scholar
[13] Zhang, Y. Q., X. Y. Zeng, L. Ma, R. R. Zhang, Z. J. Zhan, C. Chen, et al. Manipulation for superposition of orbital angular momentum states in surface plasmon polaritons. Advanced Optical Materials, Vol. 7, No. 18, 2019, id. 1900372.10.1002/adom.201900372Search in Google Scholar
[14] Zhang, Y. Q., X. Y. Zeng, R. R. Zhang, Z. J. Zhan, X. Liu, L. Ma, et al. Generation of a plasmonic radially polarized vector beam with linearly polarized illumination. Optics Letters, Vol. 43, No. 17, 2018, pp. 4208–4211.10.1364/OL.43.004208Search in Google Scholar PubMed
[15] Li, Z. H., H. P. Liu, X. M. Zheng, Y. Q. Zhang, R. R. Zhang, S. C. Xu, et al. Metasurface of deflection prism phases for generating non-diffracting optical vortex lattices. Optics Express, Vol. 26, No. 22, 2018, pp. 28228–28237.10.1364/OE.26.028228Search in Google Scholar PubMed
[16] Akram, M. R., G. Ding, K. Chen, Y. Feng, and W. Zhu. Ultra-thin single layer metasurfaces with ultra-wideband operation for both transmission and reflection. Advanced Materials, Vol. 32, No. 12, 2020, id. 1907308.10.1002/adma.201907308Search in Google Scholar PubMed
[17] Zhang, J., X. Wei, I. D. Rukhlenko, H. T. Chen, and W. Zhu. Electrically tunable metasurface with independent frequency and amplitude modulations. ACS Photonics, Vol. 7, No. 1, 2020, pp. 265–271.10.1021/acsphotonics.9b01532Search in Google Scholar
[18] Zhang, J., H. Zhang, W. Yang, K. Chen, X. Wei, Y. Feng, et al. Dynamic scattering steering with graphene-based coding meta-mirror. Advanced Optical Materials, Vol. 8, No. 19, 2020, id. 2000683.10.1002/adom.202000683Search in Google Scholar
[19] Yang, H. and N. Y. Kim. Microcavity exciton-polariton quantum spin fluids. Advanced Quantum Technologies, Vol. 5, No. 7, 2022, id. 2100137.10.1002/qute.202100137Search in Google Scholar
[20] Akram, M. R., X. Bai, R. Jin, G. A. E. Vandenbosch, M. Premaratne, and W. Zhu. Photon spin Hall effect based ultra-thin transmissive metasurface for efficient generation of OAM waves. IEEE Transactions on Antennas and Propagation, Vol. 67, No. 7, 2019, pp. 4650–4658.10.1109/TAP.2019.2905777Search in Google Scholar
[21] Zhao, J., X. Jing, W. Wang, Y. Tian, D. Zhu, and G. Shi. Steady method to retrieve effective electromagnetic parameters of bianisotropic metamaterials at one incident direction in the terahertz region. Optics & Laser Technology, Vol. 95, 2017, pp. 56–62.10.1016/j.optlastec.2017.04.001Search in Google Scholar
[22] Jiang, L., B. Fang, Z. Yan, J. Fan, C. Qi, J. Liu, et al. Terahertz high and near-zero refractive index metamaterials by double layer metal ring microstructure. Optics & Laser Technology, Vol. 123, 2020, id. 105949.10.1016/j.optlastec.2019.105949Search in Google Scholar
[23] Krasikov, S., A. Tranter, A. Bogdanov, and Y. Kivshar. Intelligent metaphotonics empowered by machine learning. Opto-Electronic Advances, Vol. 5, No. 3, 2022, id. 210147.10.29026/oea.2022.210147Search in Google Scholar
[24] Liu, Z., L. Qi, F. Lan, C. Lan, J. Yang, and X. Tao. A VO2 film-based multifunctional metasurface in the terahertz band. Chinese Optics Letters, Vol. 20, 2022, id. 013602.10.3788/COL202220.013602Search in Google Scholar
[25] Fang, B., Z. Cai, Y. Peng, C. Li, Z. Hong, and X. Jing. Realization of ultrahigh refractive index in terahertz region by multiple layers coupled metal ring metamaterials. Journal of Electromagnetic Waves and Applications, Vol. 33, No. 11, 2019, pp. 1375–1390.10.1080/09205071.2019.1608868Search in Google Scholar
[26] Fang, B., B. Li, Y. Peng, C. Li, Z. Hong, and X. Jing. Polarization-independent multiband metamaterials absorber by fundamental cavity mode of multilayer microstructure. Microwave and Optical Technology Letters, Vol. 61, 2019, pp. 2385–2391.10.1002/mop.31890Search in Google Scholar
[27] Wang, W., X. Jing, J. Zhao, Y. Li, and Y. Tian. Improvement of accuracy of simple methods for design and analysis of a blazed phase grating microstructure. Optica Applicata, Vol. 47, No. 2, 2017, pp. 183–198.Search in Google Scholar
[28] Jiang, L., B. Fang, Z. Yan, C. Li, J. Fu, H. Gan, et al. Improvement of unidirectional scattering characteristics based on multiple nanospheres array. Microwave and Optical Technology Letters, Vol. 62, No. 6, 2020, pp. 2405–2414.10.1002/mop.32328Search in Google Scholar
[29] Cai, S., W. Hu, Y. Liu, J. Ning, S. Feng, C. Jin, et al. Optical fiber hydrogen sensor using metasurfaces composed of palladium. Chinese Optics Letters, Vol. 20, 2022, id. 053601.10.3788/COL202220.053601Search in Google Scholar
[30] Jin, C., W. Wu, L. Cao, B. Gao, J. Chen, W. Cai, et al. Fabrication of lithium niobate metasurfaces via a combination of FIB and ICP-RIE. Chinese Optics Letters, Vol. 20, 2022, id. 113602.10.3788/COL202220.113602Search in Google Scholar
[31] Wang, P., F. He, J. Liu, F. Shu, B. Fang, T. Lang, et al. Ultra-high-Q resonances in terahertz all-silicon metasurfaces based on bound states in the continuum. Photonics Research, Vol. 10, 2022, pp. 2743–2750.10.1364/PRJ.470657Search in Google Scholar
[32] Zhu, Y., B. Lu, Z. Fan, F. Yue, X. Zang, A. V. Balakin, et al. Geometric metasurface for polarization synthesis and multidimensional multiplexing of terahertz converged vortices. Photonics Research, Vol. 10, 2022, pp. 1517–1532.10.1364/PRJ.455459Search in Google Scholar
[33] Gheorghiu, C., M. Cerchez, E. Aktan, R. Prasad, F. Yilmaz, N. Yilmaz, et al. Fabrication of micrometre-sized periodic gratings in free-standing metallic foils for laser–plasma experiments. High Power Laser Science and Engineering, Vol. 10, 2022, id. 010000e3.10.1017/hpl.2021.57Search in Google Scholar
[34] Wang, G., J. Song, Y. Chen, S. Ren, P. Ma, W. Liu, et al. Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality. High Power Laser Science and Engineering, Vol. 10, 2022, id. 04000e22.10.1017/hpl.2022.12Search in Google Scholar
[35] Jing, X., X. Gui, P. Zhou, and Z. Hong. Physical explanation of Fabry-Pérot cavity for broadband bilayer metamaterials polarization converter. Journal of Lightwave Technology, Vol. 36, No. 12, 2018, pp. 2322–2327.10.1109/JLT.2018.2808339Search in Google Scholar
[36] Xia, R., X. Jing, X. Gui, and Y. Tian. Broadband terahertz half-wave plate based on anisotropic polarization conversion metamaterials. Optics Materials Express, Vol. 7, No. 3, 2017, pp. 977–988.10.1364/OME.7.000977Search in Google Scholar
[37] Liu, T., M. Zhu, W. Du, J. Shi, J. Sun, Y. Chai, et al. A nodule dome removal strategy to improve the laser-induced damage threshold of coatings. High Power Laser Science and Engineering, Vol. 10, 2022, id. 05000e30.10.1017/hpl.2022.24Search in Google Scholar
[38] Balram, K. C. and K. Srinivasan. Piezoelectric optomechanical approaches for efficient quantum microwave-to-optical signal transduction: The need for co-design. Advanced Quantum Technologies, Vol. 5, No. 3, 2022, id. 2100095.10.1002/qute.202100095Search in Google Scholar
[39] Lu, Y. D., Y. Xu, X. Ouyang, M. C. Xian, Y. Y. Cao, K. Chen, et al. Cylindrical vector beams reveal radiationless anapole condition in a resonant state. Opto-Electronic Advances, Vol. 5, 2022, id. 210014.10.29026/oea.2022.210014Search in Google Scholar
[40] Cai, W. H., Y. Tian, S. Wang, C. You, Q. Zhou, and R. B. Jin. Optimized design of the lithium niobate for spectrally-pure-state generation at MIR wavelengths using metaheuristic algorithm. Advanced Quantum Technologies, Vol. 5, No. 7, 2022, id. 2200028.10.1002/qute.202200028Search in Google Scholar
[41] Kinsey, N., C. Devault, A. Boltasseva, and V. Shalaev. Near-zero-index materials for photonics. Nature Reviews Materials, Vol. 4, 2019, pp. 742–760.10.1038/s41578-019-0133-0Search in Google Scholar
[42] Enoch, S., G. Tayeb, P. Sabouroux, N. Guerin, and P. Vincent. A metamaterial for directive emission. Physical Review Letters, Vol. 89, 2002, id. 213902.10.1103/PhysRevLett.89.213902Search in Google Scholar PubMed
[43] Alù, A., M. Silveirinha, A. Salandrino, and N. Engheta. Epsilon-near-zero metamaterials and electromagnetic sources: tailoring the radiation phase pattern. Physical Review B, Vol. 75, 2007, id. 155410.10.1103/PhysRevB.75.155410Search in Google Scholar
[44] Yun, S., Z. Jiang, Q. Xu, Z. Liu, D. Werner, and T. Mayer. Low-loss impedance-matched optical metamaterials with zerophase delay. ACS Nano, Vol. 6, 2012, pp. 4475–4482.10.1021/nn3012338Search in Google Scholar PubMed
[45] Zhou, Z., Y. Li, E. Nahvi, and N. Engheta. General impedance matching via doped epsilon-near-zero media. Physical Review Applied, Vol. 13, 2020, id. 034005.10.1103/PhysRevApplied.13.034005Search in Google Scholar
[46] Liberal, I., A. Mahmoud, Y. Li, B. Edwards, and N. Engheta. Photonic doping of epsilon-near-zero media. Science, Vol. 355, 2017, pp. 1058–1062.10.1126/science.aal2672Search in Google Scholar PubMed
[47] Zhou, Z. H. and Y. Li. A photonic-doping-inspired SIW antenna with lengthinvariant operating frequency. IEEE Transactions on Antennas and Propagation, Vol. 68, 2020, pp. 5151–5158.10.1109/TAP.2020.2977746Search in Google Scholar
[48] Huang, X., Y. Lai, Z. Hang, H. Zheng, and C. Chan. Dirac cones induced by accidental degeneracy in photonic crystals and zero-refractive-index materials. Nature Materials, Vol. 10, 2011, pp. 582–586.10.1038/nmat3030Search in Google Scholar PubMed
[49] Mei, J., Y. Wu, C. T. Chan, and Z. Q. Zhang. First-principles study of Dirac and Dirac-like cones in phononic and photonic crystals. Physical Review B, Vol. 86, 2012, id. 035141.10.1103/PhysRevB.86.035141Search in Google Scholar
[50] Sakoda, K. Universality of mode symmetries in creating photonic Dirac cones. Journal of the Optical Society of America B, Vol. 29, 2012, pp. 2770–2778.10.1364/JOSAB.29.002770Search in Google Scholar
[51] Soukoulis, C. M. and M. Wegener. Past achievements and future challenges in the development of three-dimensional photonic metamaterials. Nature Photonics, Vol. 5, 2011, pp. 523–530.10.1038/nphoton.2011.154Search in Google Scholar
[52] Pendry, J. B., A. J. Holden, W. J. Stewart, and I. Youngs. Extremely low frequency plasmons in metallic mesostructures. Physical Review Letters, Vol. 76, 1996, pp. 4773–4776.10.1103/PhysRevLett.76.4773Search in Google Scholar PubMed
[53] Pendry, J. B., J. A. Holden, J. D. Robbins, and J. W. Stewart. Magnetism from conductors and enhanced nonlinear phenomena. IEEE Transactions on Microwave Theory and Techniques, Vol. 47, 1999, pp. 2075–2084.10.1109/22.798002Search in Google Scholar
[54] Valentine, J., S. Zhang, T. Zentgraf, E. U. Avila, D. A. Genov, G. Bartal, et al. Three-dimensional optical metamaterial with a negative refractive index. Nature, Vol. 455, 2008, pp. 376–379.10.1038/nature07247Search in Google Scholar PubMed
[55] Li, Y., C. T. Chan, and E. Mazur. Dirac-like cone-based electromagnetic zero-index metamaterials. Light: Science & Applications, Vol. 10, 2021, id. 203.10.1038/s41377-021-00642-2Search in Google Scholar PubMed PubMed Central
[56] Ziolkowski, R. W. Propagation in and scattering from a matched metamaterial having a zero index of refraction. Physical Review E, Vol. 70, 2004, id. 046608.10.1103/PhysRevE.70.046608Search in Google Scholar PubMed
[57] Smith, D. R., S. Schultz, P. Markos, and C. M. Soukoulis. Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients. Physical Review B, Vol. 65, 2002, id. 195104.10.1103/PhysRevB.65.195104Search in Google Scholar
[58] Koschny, T., P. Marko, E. N. Economou, D. R. Smith, D. C. Vier, and C. M. Soukoulis. Impact of inherent periodic structure on effective medium description of lefthanded and related metamaterials. Physical Review B, Vol. 71, 2005, id. 5105.10.1103/PhysRevB.71.245105Search in Google Scholar
[59] Smith, D. R., D. C. Vier, T. Koschny, and C. M. Soukoulis. Electromagnetic parameter retrieval from inhomogeneous metamaterials. Physical Review E, Vol. 71, 2005, pp. 142–154.10.1103/PhysRevE.71.036617Search in Google Scholar PubMed
[60] Moitra, P., Y. Yang, Z. Anderson, I. Kravchenko, D. Briggs, and J. Valentine. Realization of an all-dielectric zero-index optical metamaterial. Nature Photonics, Vol. 7, 2013, pp. 791–795.10.1038/nphoton.2013.214Search in Google Scholar
[61] Li, Y., S. Kita, P. Munoz, O. Reshef, D. Vulis, M. Yin, et al. On-chip zero-index metamaterials. Nature Photonics, Vol. 9, 2015, pp. 738–742.10.1038/nphoton.2015.198Search in Google Scholar
[62] Kita, S., Y. Li, P. C. Munoz, O. Reshef, D. Vulis, R. Day, et al. On-chip all-dielectric fabrication-tolerant zero-index metamaterials. Optics Express, Vol. 25, 2017, pp. 8326–8334.10.1364/OE.25.008326Search in Google Scholar PubMed
[63] Vulis, D., Y. Li, O. Reshef, P. Munoz, M. Yin, S. Kita, et al. Monolithic CMOS-compatible zero-index metamaterials. Optics Express, Vol. 25, 2017, pp. 12381–12399.10.1364/OE.25.012381Search in Google Scholar PubMed
[64] Reshef, O., P. Munoz, D. Vulis, Y. Li, M. Loncar, and E. Mazur. Direct observation of phase-free propagation in a silicon waveguide. ACS Photonics, Vol. 4, 2017, pp. 2385–2389.10.1021/acsphotonics.7b00760Search in Google Scholar
[65] Hsu C., B. Zhen, A. Stone, J. Joannopoulos and M. Soljacic. Zero-index bound states in the continuum. Physical Review Letters, Vol. 121, 2018, id. 263901.Search in Google Scholar
© 2023 the author(s), published by De Gruyter
This work is licensed under the Creative Commons Attribution 4.0 International License.
Articles in the same Issue
- Review Articles
- Progress in preparation and ablation resistance of ultra-high-temperature ceramics modified C/C composites for extreme environment
- Solar lighting systems applied in photocatalysis to treat pollutants – A review
- Technological advances in three-dimensional skin tissue engineering
- Hybrid magnesium matrix composites: A review of reinforcement philosophies, mechanical and tribological characteristics
- Application prospect of calcium peroxide nanoparticles in biomedical field
- Research progress on basalt fiber-based functionalized composites
- Evaluation of the properties and applications of FRP bars and anchors: A review
- A critical review on mechanical, durability, and microstructural properties of industrial by-product-based geopolymer composites
- Multifunctional engineered cementitious composites modified with nanomaterials and their applications: An overview
- Role of bioglass derivatives in tissue regeneration and repair: A review
- Research progress on properties of cement-based composites incorporating graphene oxide
- Properties of ultra-high performance concrete and conventional concrete with coal bottom ash as aggregate replacement and nanoadditives: A review
- A scientometric review of the literature on the incorporation of steel fibers in ultra-high-performance concrete with research mapping knowledge
- Weldability of high nitrogen steels: A review
- Application of waste recycle tire steel fibers as a construction material in concrete
- Wear properties of graphene-reinforced aluminium metal matrix composite: A review
- Experimental investigations of electrodeposited Zn–Ni, Zn–Co, and Ni–Cr–Co–based novel coatings on AA7075 substrate to ameliorate the mechanical, abrasion, morphological, and corrosion properties for automotive applications
- Research evolution on self-healing asphalt: A scientometric review for knowledge mapping
- Recent developments in the mechanical properties of hybrid fiber metal laminates in the automotive industry: A review
- A review of microscopic characterization and related properties of fiber-incorporated cement-based materials
- Comparison and review of classical and machine learning-based constitutive models for polymers used in aeronautical thermoplastic composites
- Gold nanoparticle-based strategies against SARS-CoV-2: A review
- Poly-ferric sulphate as superior coagulant: A review on preparation methods and properties
- A review on ceramic waste-based concrete: A step toward sustainable concrete
- Modification of the structure and properties of oxide layers on aluminium alloys: A review
- A review of magnetically driven swimming microrobots: Material selection, structure design, control method, and applications
- Polyimide–nickel nanocomposites fabrication, properties, and applications: A review
- Design and analysis of timber-concrete-based civil structures and its applications: A brief review
- Effect of fiber treatment on physical and mechanical properties of natural fiber-reinforced composites: A review
- Blending and functionalisation modification of 3D printed polylactic acid for fused deposition modeling
- A critical review on functionally graded ceramic materials for cutting tools: Current trends and future prospects
- Heme iron as potential iron fortifier for food application – characterization by material techniques
- An overview of the research trends on fiber-reinforced shotcrete for construction applications
- High-entropy alloys: A review of their performance as promising materials for hydrogen and molten salt storage
- Effect of the axial compression ratio on the seismic behavior of resilient concrete walls with concealed column stirrups
- Research Articles
- Effect of fiber orientation and elevated temperature on the mechanical properties of unidirectional continuous kenaf reinforced PLA composites
- Optimizing the ECAP processing parameters of pure Cu through experimental, finite element, and response surface approaches
- Study on the solidification property and mechanism of soft soil based on the industrial waste residue
- Preparation and photocatalytic degradation of Sulfamethoxazole by g-C3N4 nano composite samples
- Impact of thermal modification on color and chemical changes of African padauk, merbau, mahogany, and iroko wood species
- The evaluation of the mechanical properties of glass, kenaf, and honeycomb fiber-reinforced composite
- Evaluation of a novel steel box-soft body combination for bridge protection against ship collision
- Study on the uniaxial compression constitutive relationship of modified yellow mud from minority dwelling in western Sichuan, China
- Ultrasonic longitudinal torsion-assisted biotic bone drilling: An experimental study
- Green synthesis, characterizations, and antibacterial activity of silver nanoparticles from Themeda quadrivalvis, in conjugation with macrolide antibiotics against respiratory pathogens
- Performance analysis of WEDM during the machining of Inconel 690 miniature gear using RSM and ANN modeling approaches
- Biosynthesis of Ag/bentonite, ZnO/bentonite, and Ag/ZnO/bentonite nanocomposites by aqueous leaf extract of Hagenia abyssinica for antibacterial activities
- Eco-friendly MoS2/waste coconut oil nanofluid for machining of magnesium implants
- Silica and kaolin reinforced aluminum matrix composite for heat storage
- Optimal design of glazed hollow bead thermal insulation mortar containing fly ash and slag based on response surface methodology
- Hemp seed oil nanoemulsion with Sapindus saponins as a potential carrier for iron supplement and vitamin D
- A numerical study on thin film flow and heat transfer enhancement for copper nanoparticles dispersed in ethylene glycol
- Research on complex multimodal vibration characteristics of offshore platform
- Applicability of fractal models for characterising pore structure of hybrid basalt–polypropylene fibre-reinforced concrete
- Influence of sodium silicate to precursor ratio on mechanical properties and durability of the metakaolin/fly ash alkali-activated sustainable mortar using manufactured sand
- An experimental study of bending resistance of multi-size PFRC beams
- Characterization, biocompatibility, and optimization of electrospun SF/PCL composite nanofiber films
- Morphological classification method and data-driven estimation of the joint roughness coefficient by consideration of two-order asperity
- Prediction and simulation of mechanical properties of borophene-reinforced epoxy nanocomposites using molecular dynamics and FEA
- Nanoemulsions of essential oils stabilized with saponins exhibiting antibacterial and antioxidative properties
- Fabrication and performance analysis of sustainable municipal solid waste incineration fly ash alkali-activated acoustic barriers
- Electrostatic-spinning construction of HCNTs@Ti3C2T x MXenes hybrid aerogel microspheres for tunable microwave absorption
- Investigation of the mechanical properties, surface quality, and energy efficiency of a fused filament fabrication for PA6
- Experimental study on mechanical properties of coal gangue base geopolymer recycled aggregate concrete reinforced by steel fiber and nano-Al2O3
- Hybrid bio-fiber/bio-ceramic composite materials: Mechanical performance, thermal stability, and morphological analysis
- Experimental study on recycled steel fiber-reinforced concrete under repeated impact
- Effect of rare earth Nd on the microstructural transformation and mechanical properties of 7xxx series aluminum alloys
- Color match evaluation using instrumental method for three single-shade resin composites before and after in-office bleaching
- Exploring temperature-resilient recycled aggregate concrete with waste rubber: An experimental and multi-objective optimization analysis
- Study on aging mechanism of SBS/SBR compound-modified asphalt based on molecular dynamics
- Evolution of the pore structure of pumice aggregate concrete and the effect on compressive strength
- Effect of alkaline treatment time of fibers and microcrystalline cellulose addition on mechanical properties of unsaturated polyester composites reinforced by cantala fibers
- Optimization of eggshell particles to produce eco-friendly green fillers with bamboo reinforcement in organic friction materials
- An effective approach to improve microstructure and tribological properties of cold sprayed Al alloys
- Luminescence and temperature-sensing properties of Li+, Na+, or K+, Tm3+, and Yb3+ co-doped Bi2WO6 phosphors
- Effect of molybdenum tailings aggregate on mechanical properties of engineered cementitious composites and stirrup-confined ECC stub columns
- Experimental study on the seismic performance of short shear walls comprising cold-formed steel and high-strength reinforced concrete with concealed bracing
- Failure criteria and microstructure evolution mechanism of the alkali–silica reaction of concrete
- Mechanical, fracture-deformation, and tribology behavior of fillers-reinforced sisal fiber composites for lightweight automotive applications
- UV aging behavior evolution characterization of HALS-modified asphalt based on micro-morphological features
- Preparation of VO2/graphene/SiC film by water vapor oxidation
- A semi-empirical model for predicting carbonation depth of RAC under two-dimensional conditions
- Comparison of the physical properties of different polyimide nanocomposite films containing organoclays varying in alkyl chain lengths
- Effects of freeze–thaw cycles on micro and meso-structural characteristics and mechanical properties of porous asphalt mixtures
- Flexural performance of a new type of slightly curved arc HRB400 steel bars reinforced one-way concrete slabs
- Alkali-activated binder based on red mud with class F fly ash and ground granulated blast-furnace slag under ambient temperature
- Facile synthesis of g-C3N4 nanosheets for effective degradation of organic pollutants via ball milling
- DEM study on the loading rate effect of marble under different confining pressures
- Conductive and self-cleaning composite membranes from corn husk nanofiber embedded with inorganic fillers (TiO2, CaO, and eggshell) by sol–gel and casting processes for smart membrane applications
- Laser re-melting of modified multimodal Cr3C2–NiCr coatings by HVOF: Effect on the microstructure and anticorrosion properties
- Damage constitutive model of jointed rock mass considering structural features and load effect
- Thermosetting polymer composites: Manufacturing and properties study
- CSG compressive strength prediction based on LSTM and interpretable machine learning
- Axial compression behavior and stress–strain relationship of slurry-wrapping treatment recycled aggregate concrete-filled steel tube short columns
- Space-time evolution characteristics of loaded gas-bearing coal fractures based on industrial μCT
- Dual-biprism-based single-camera high-speed 3D-digital image correlation for deformation measurement on sandwich structures under low velocity impact
- Effects of cold deformation modes on microstructure uniformity and mechanical properties of large 2219 Al–Cu alloy rings
- Basalt fiber as natural reinforcement to improve the performance of ecological grouting slurry for the conservation of earthen sites
- Interaction of micro-fluid structure in a pressure-driven duct flow with a nearby placed current-carrying wire: A numerical investigation
- A simulation modeling methodology considering random multiple shots for shot peening process
- Optimization and characterization of composite modified asphalt with pyrolytic carbon black and chicken feather fiber
- Synthesis, characterization, and application of the novel nanomagnet adsorbent for the removal of Cr(vi) ions
- Multi-perspective structural integrity-based computational investigations on airframe of Gyrodyne-configured multi-rotor UAV through coupled CFD and FEA approaches for various lightweight sandwich composites and alloys
- Influence of PVA fibers on the durability of cementitious composites under the wet–heat–salt coupling environment
- Compressive behavior of BFRP-confined ceramsite concrete: An experimental study and stress–strain model
- Interval models for uncertainty analysis and degradation prediction of the mechanical properties of rubber
- Preparation of PVDF-HFP/CB/Ni nanocomposite films for piezoelectric energy harvesting
- Frost resistance and life prediction of recycled brick aggregate concrete with waste polypropylene fiber
- Synthetic leathers as a possible source of chemicals and odorous substances in indoor environment
- Mechanical properties of seawater volcanic scoria aggregate concrete-filled circular GFRP and stainless steel tubes under axial compression
- Effect of curved anchor impellers on power consumption and hydrodynamic parameters of yield stress fluids (Bingham–Papanastasiou model) in stirred tanks
- All-dielectric tunable zero-refractive index metamaterials based on phase change materials
- Influence of ultrasonication time on the various properties of alkaline-treated mango seed waste filler reinforced PVA biocomposite
- Research on key casting process of high-grade CNC machine tool bed nodular cast iron
- Latest research progress of SiCp/Al composite for electronic packaging
- Special Issue on 3D and 4D Printing of Advanced Functional Materials - Part I
- Molecular dynamics simulation on electrohydrodynamic atomization: Stable dripping mode by pre-load voltage
- Research progress of metal-based additive manufacturing in medical implants
Articles in the same Issue
- Review Articles
- Progress in preparation and ablation resistance of ultra-high-temperature ceramics modified C/C composites for extreme environment
- Solar lighting systems applied in photocatalysis to treat pollutants – A review
- Technological advances in three-dimensional skin tissue engineering
- Hybrid magnesium matrix composites: A review of reinforcement philosophies, mechanical and tribological characteristics
- Application prospect of calcium peroxide nanoparticles in biomedical field
- Research progress on basalt fiber-based functionalized composites
- Evaluation of the properties and applications of FRP bars and anchors: A review
- A critical review on mechanical, durability, and microstructural properties of industrial by-product-based geopolymer composites
- Multifunctional engineered cementitious composites modified with nanomaterials and their applications: An overview
- Role of bioglass derivatives in tissue regeneration and repair: A review
- Research progress on properties of cement-based composites incorporating graphene oxide
- Properties of ultra-high performance concrete and conventional concrete with coal bottom ash as aggregate replacement and nanoadditives: A review
- A scientometric review of the literature on the incorporation of steel fibers in ultra-high-performance concrete with research mapping knowledge
- Weldability of high nitrogen steels: A review
- Application of waste recycle tire steel fibers as a construction material in concrete
- Wear properties of graphene-reinforced aluminium metal matrix composite: A review
- Experimental investigations of electrodeposited Zn–Ni, Zn–Co, and Ni–Cr–Co–based novel coatings on AA7075 substrate to ameliorate the mechanical, abrasion, morphological, and corrosion properties for automotive applications
- Research evolution on self-healing asphalt: A scientometric review for knowledge mapping
- Recent developments in the mechanical properties of hybrid fiber metal laminates in the automotive industry: A review
- A review of microscopic characterization and related properties of fiber-incorporated cement-based materials
- Comparison and review of classical and machine learning-based constitutive models for polymers used in aeronautical thermoplastic composites
- Gold nanoparticle-based strategies against SARS-CoV-2: A review
- Poly-ferric sulphate as superior coagulant: A review on preparation methods and properties
- A review on ceramic waste-based concrete: A step toward sustainable concrete
- Modification of the structure and properties of oxide layers on aluminium alloys: A review
- A review of magnetically driven swimming microrobots: Material selection, structure design, control method, and applications
- Polyimide–nickel nanocomposites fabrication, properties, and applications: A review
- Design and analysis of timber-concrete-based civil structures and its applications: A brief review
- Effect of fiber treatment on physical and mechanical properties of natural fiber-reinforced composites: A review
- Blending and functionalisation modification of 3D printed polylactic acid for fused deposition modeling
- A critical review on functionally graded ceramic materials for cutting tools: Current trends and future prospects
- Heme iron as potential iron fortifier for food application – characterization by material techniques
- An overview of the research trends on fiber-reinforced shotcrete for construction applications
- High-entropy alloys: A review of their performance as promising materials for hydrogen and molten salt storage
- Effect of the axial compression ratio on the seismic behavior of resilient concrete walls with concealed column stirrups
- Research Articles
- Effect of fiber orientation and elevated temperature on the mechanical properties of unidirectional continuous kenaf reinforced PLA composites
- Optimizing the ECAP processing parameters of pure Cu through experimental, finite element, and response surface approaches
- Study on the solidification property and mechanism of soft soil based on the industrial waste residue
- Preparation and photocatalytic degradation of Sulfamethoxazole by g-C3N4 nano composite samples
- Impact of thermal modification on color and chemical changes of African padauk, merbau, mahogany, and iroko wood species
- The evaluation of the mechanical properties of glass, kenaf, and honeycomb fiber-reinforced composite
- Evaluation of a novel steel box-soft body combination for bridge protection against ship collision
- Study on the uniaxial compression constitutive relationship of modified yellow mud from minority dwelling in western Sichuan, China
- Ultrasonic longitudinal torsion-assisted biotic bone drilling: An experimental study
- Green synthesis, characterizations, and antibacterial activity of silver nanoparticles from Themeda quadrivalvis, in conjugation with macrolide antibiotics against respiratory pathogens
- Performance analysis of WEDM during the machining of Inconel 690 miniature gear using RSM and ANN modeling approaches
- Biosynthesis of Ag/bentonite, ZnO/bentonite, and Ag/ZnO/bentonite nanocomposites by aqueous leaf extract of Hagenia abyssinica for antibacterial activities
- Eco-friendly MoS2/waste coconut oil nanofluid for machining of magnesium implants
- Silica and kaolin reinforced aluminum matrix composite for heat storage
- Optimal design of glazed hollow bead thermal insulation mortar containing fly ash and slag based on response surface methodology
- Hemp seed oil nanoemulsion with Sapindus saponins as a potential carrier for iron supplement and vitamin D
- A numerical study on thin film flow and heat transfer enhancement for copper nanoparticles dispersed in ethylene glycol
- Research on complex multimodal vibration characteristics of offshore platform
- Applicability of fractal models for characterising pore structure of hybrid basalt–polypropylene fibre-reinforced concrete
- Influence of sodium silicate to precursor ratio on mechanical properties and durability of the metakaolin/fly ash alkali-activated sustainable mortar using manufactured sand
- An experimental study of bending resistance of multi-size PFRC beams
- Characterization, biocompatibility, and optimization of electrospun SF/PCL composite nanofiber films
- Morphological classification method and data-driven estimation of the joint roughness coefficient by consideration of two-order asperity
- Prediction and simulation of mechanical properties of borophene-reinforced epoxy nanocomposites using molecular dynamics and FEA
- Nanoemulsions of essential oils stabilized with saponins exhibiting antibacterial and antioxidative properties
- Fabrication and performance analysis of sustainable municipal solid waste incineration fly ash alkali-activated acoustic barriers
- Electrostatic-spinning construction of HCNTs@Ti3C2T x MXenes hybrid aerogel microspheres for tunable microwave absorption
- Investigation of the mechanical properties, surface quality, and energy efficiency of a fused filament fabrication for PA6
- Experimental study on mechanical properties of coal gangue base geopolymer recycled aggregate concrete reinforced by steel fiber and nano-Al2O3
- Hybrid bio-fiber/bio-ceramic composite materials: Mechanical performance, thermal stability, and morphological analysis
- Experimental study on recycled steel fiber-reinforced concrete under repeated impact
- Effect of rare earth Nd on the microstructural transformation and mechanical properties of 7xxx series aluminum alloys
- Color match evaluation using instrumental method for three single-shade resin composites before and after in-office bleaching
- Exploring temperature-resilient recycled aggregate concrete with waste rubber: An experimental and multi-objective optimization analysis
- Study on aging mechanism of SBS/SBR compound-modified asphalt based on molecular dynamics
- Evolution of the pore structure of pumice aggregate concrete and the effect on compressive strength
- Effect of alkaline treatment time of fibers and microcrystalline cellulose addition on mechanical properties of unsaturated polyester composites reinforced by cantala fibers
- Optimization of eggshell particles to produce eco-friendly green fillers with bamboo reinforcement in organic friction materials
- An effective approach to improve microstructure and tribological properties of cold sprayed Al alloys
- Luminescence and temperature-sensing properties of Li+, Na+, or K+, Tm3+, and Yb3+ co-doped Bi2WO6 phosphors
- Effect of molybdenum tailings aggregate on mechanical properties of engineered cementitious composites and stirrup-confined ECC stub columns
- Experimental study on the seismic performance of short shear walls comprising cold-formed steel and high-strength reinforced concrete with concealed bracing
- Failure criteria and microstructure evolution mechanism of the alkali–silica reaction of concrete
- Mechanical, fracture-deformation, and tribology behavior of fillers-reinforced sisal fiber composites for lightweight automotive applications
- UV aging behavior evolution characterization of HALS-modified asphalt based on micro-morphological features
- Preparation of VO2/graphene/SiC film by water vapor oxidation
- A semi-empirical model for predicting carbonation depth of RAC under two-dimensional conditions
- Comparison of the physical properties of different polyimide nanocomposite films containing organoclays varying in alkyl chain lengths
- Effects of freeze–thaw cycles on micro and meso-structural characteristics and mechanical properties of porous asphalt mixtures
- Flexural performance of a new type of slightly curved arc HRB400 steel bars reinforced one-way concrete slabs
- Alkali-activated binder based on red mud with class F fly ash and ground granulated blast-furnace slag under ambient temperature
- Facile synthesis of g-C3N4 nanosheets for effective degradation of organic pollutants via ball milling
- DEM study on the loading rate effect of marble under different confining pressures
- Conductive and self-cleaning composite membranes from corn husk nanofiber embedded with inorganic fillers (TiO2, CaO, and eggshell) by sol–gel and casting processes for smart membrane applications
- Laser re-melting of modified multimodal Cr3C2–NiCr coatings by HVOF: Effect on the microstructure and anticorrosion properties
- Damage constitutive model of jointed rock mass considering structural features and load effect
- Thermosetting polymer composites: Manufacturing and properties study
- CSG compressive strength prediction based on LSTM and interpretable machine learning
- Axial compression behavior and stress–strain relationship of slurry-wrapping treatment recycled aggregate concrete-filled steel tube short columns
- Space-time evolution characteristics of loaded gas-bearing coal fractures based on industrial μCT
- Dual-biprism-based single-camera high-speed 3D-digital image correlation for deformation measurement on sandwich structures under low velocity impact
- Effects of cold deformation modes on microstructure uniformity and mechanical properties of large 2219 Al–Cu alloy rings
- Basalt fiber as natural reinforcement to improve the performance of ecological grouting slurry for the conservation of earthen sites
- Interaction of micro-fluid structure in a pressure-driven duct flow with a nearby placed current-carrying wire: A numerical investigation
- A simulation modeling methodology considering random multiple shots for shot peening process
- Optimization and characterization of composite modified asphalt with pyrolytic carbon black and chicken feather fiber
- Synthesis, characterization, and application of the novel nanomagnet adsorbent for the removal of Cr(vi) ions
- Multi-perspective structural integrity-based computational investigations on airframe of Gyrodyne-configured multi-rotor UAV through coupled CFD and FEA approaches for various lightweight sandwich composites and alloys
- Influence of PVA fibers on the durability of cementitious composites under the wet–heat–salt coupling environment
- Compressive behavior of BFRP-confined ceramsite concrete: An experimental study and stress–strain model
- Interval models for uncertainty analysis and degradation prediction of the mechanical properties of rubber
- Preparation of PVDF-HFP/CB/Ni nanocomposite films for piezoelectric energy harvesting
- Frost resistance and life prediction of recycled brick aggregate concrete with waste polypropylene fiber
- Synthetic leathers as a possible source of chemicals and odorous substances in indoor environment
- Mechanical properties of seawater volcanic scoria aggregate concrete-filled circular GFRP and stainless steel tubes under axial compression
- Effect of curved anchor impellers on power consumption and hydrodynamic parameters of yield stress fluids (Bingham–Papanastasiou model) in stirred tanks
- All-dielectric tunable zero-refractive index metamaterials based on phase change materials
- Influence of ultrasonication time on the various properties of alkaline-treated mango seed waste filler reinforced PVA biocomposite
- Research on key casting process of high-grade CNC machine tool bed nodular cast iron
- Latest research progress of SiCp/Al composite for electronic packaging
- Special Issue on 3D and 4D Printing of Advanced Functional Materials - Part I
- Molecular dynamics simulation on electrohydrodynamic atomization: Stable dripping mode by pre-load voltage
- Research progress of metal-based additive manufacturing in medical implants