Abstract

Thin-film all-dielectric Fabry–Perot filters can nowadays be patterned onto pixels of commercial imaging sensors used for spectral imaging. For these patterned filters, standard transfer-matrix thin-film calculations fail to predict their angular dependency. This Letter attributes the discrepancy to the finite filter size and is also, to my knowledge, the first study to analyze this for patterned all-dielectric Fabry–Perot filters. An angular spectrum approach that enables prediction without full knowledge of the filter design is introduced. In addition, the contribution of diffraction at normal incidence is characterized by a single dimensionless parameter. Knowing that patterned filter size matters and having a method to efficiently simulate its effect can guide ongoing miniaturization efforts and filter design.

© 2021 Optica Publishing Group

All-polymeric high-Q optofluidic Fabry–Perot resonator

Genni Testa, Gianluca Persichetti, and Romeo Bernini
Opt. Lett. 46(2) 352-355 (2021)

High-purity and wide-angle reflective structural colors based on an all-dielectric Fabry–Pérot cavity structure

Zhengmei Yang, Wenfeng Li, and Huigao Duan
Opt. Lett. 49(3) 594-597 (2024)

All-dielectric ultra-thin metasurface angular filter

Qinyu Qian, Sun Ti, and Chinhua Wang
Opt. Lett. 44(16) 3984-3987 (2019)

Superposition Fabry–Perot filter array for a computational hyperspectral camera

Shiqi Feng, Zhanshan Wang, Xinbin Cheng, and Xiong Dun
Opt. Lett. 48(5) 1156-1159 (2023)

Active hyperspectral imager using a tunable supercontinuum light source based on a MEMS Fabry–Perot interferometer

Teemu Kääriäinen and Timo Dönsberg
Opt. Lett. 46(22) 5533-5536 (2021)