Miniaturization of a-Si guided mode resonance filter arrays for near-IR multi-spectral filtering

Ng, Ryan C.
Garcia, Juan C.
Greer, Julia R.
Fountaine, Katherine T.

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Publication date

September 2020

Publisher

AIP Publishing

Language

English

Abstract

Sub-wavelength periodic arrays exhibit narrow near-unity reflection bands that arise from guided mode resonances. These resonances have extremely high quality factor (i.e., narrow band features) and are ideal for filtering applications. A high quality factor requires many periods, causing large lateral footprints that limit an imaging system's spatial resolution. We present a 1D ultra-thin (<100 nm) compact finite design of seven periods of amorphous Si slabs with subwavelength periodicity surrounded by Al mirrors, which allow the finite array to approximate an infinite array and enabling a small footprint (∼5 μm), for near-infrared applications (λ = 800–2000 nm). We demonstrate spectral tunability (amplitude, bandwidth, and peak location) ...

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Miniaturization of a-Si guided mode resonance filter arrays for near-IR multi-spectral filtering

Abstract

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Miniaturization of a-Si guided mode resonance filter arrays for near-IR multi-spectral filtering

Abstract

Extracted data

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