Ultra-narrowband polarization insensitive transmission filter using a coupled dielectric-metal metasurface
article
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 FullWidth at Half Maximum (FWHM) of 10 nm. The filter also has a 100 nm quiet zone with ~10 -2 transmittance. A radiating twooscillator 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.
TNO Identifier
874763
Source
Optics Express, 28(1), pp. 773-787.
Publisher
Optical Society of America OSA
Collation
15 p.
Place of publication
Rochester, NY, USA
Pages
773-787
Files
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