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Narrowband transmission filters based on resonant waveguide gratings and conformal dielectric-plasmonic coatings

  • Benjamin Gallinet ORCID logo EMAIL logo , Giorgio Quaranta and Christian Schneider
Published/Copyright: November 2, 2020
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Abstract

Nanostructured filter arrays on image sensors are promising for miniature spectrometers and spectral imagers. In this work, we report on resonant waveguide gratings fabricated by UV nanoimprint lithography and conformal dielectric-plasmonic coatings. Optical measurements in accordance with numerical simulations report on a resonance bandwidth of 20 nm in transmission in the visible range. The impact of cladding thickness and filter lateral size on the resonance properties is investigated with the help of numerical calculations. Finally, it is shown that the proposed geometry based on conformal coatings has a very efficient blocking rate compared to other nanostructured filter approaches.


Corresponding author: Benjamin Gallinet, CSEM Muttenz, Tramstrasse 99, 4132Muttenz, Switzerland, E-mail:

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-08-11
Accepted: 2020-10-13
Published Online: 2020-11-02
Published in Print: 2021-02-23

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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