Ultra-narrowband polarization insensitive transmission filter using a coupled dielectric-metal metasurface

A. Nagarajan (Corresponding author), K. van Erve, G. Gerini

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
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Abstract

A coupled dielectric-metal metasurface (CDMM) filter consisting of amorphous silicon (a-Si) rings and subwavelength holes in Au layer separated by a SiO2 layer is presented. The design parameters of the CDMM filter is numerically optimized to have a polarization independent peak transmittance of 0.55 at 1540 nm with a Full Width at Half Maximum (FWHM) of 10 nm. The filter also has a 100 nm quiet zone with ∼10−2 transmittance. A radiating two-oscillator model reveals the fundamental resonances in the filter which interfere to produce the electromagnetically induced transparency (EIT) like effect. Multipole expansion of the currents in the structure validates the fundamental resonances predicted by the two-oscillator model. The presented CDMM filter is robust to artifacts in device fabrication and has performances comparable to a conventional Fabry-Pérot filter. However, it is easier to be integrated in image sensors as the transmittance peak can be tuned by only changing the periodicity resulting in a planar structure with a fixed height.
Original languageEnglish
Pages (from-to)773-787
Number of pages15
JournalOptics Express
Volume28
Issue number1
DOIs
Publication statusPublished - 6 Jan 2020

Keywords

  • Bragg reflectors
  • Extinction coefficients
  • Holographic recording
  • Mie resonances
  • Multispectral imaging
  • Transmission coefficient

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