[18p-211B-1~13] 4.1 Plasmonics and Nanophotonics

▲ [18p-211B-8] Asymmetric Fabry-Perot cavity based perfect absorber for infrared spectroscopic devices

〇(D)Anh Tung Doan^1,2, Thang Duy Dao¹, Satoshi Ishii¹, Tadaaki Nagao^1,2 (1.International Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan, 2.Department of Condensed Matter Physics, Hokkaido University, Sapporo 060-0810, Japan)

Keywords:asymmetric Fabry-Perot cavity, spectrally selective thermal emitter, spectrally selective thermal detector

In this work, we proposed and investigated asymmetric Fabry-Perot (FP) cavity based spectrally selective thermal emitters and detectors in two forms: plain Metal-Dielectric-Metal (MDM) and hybrid {Distributed Bragg Reflector}-Dielectric-Metal (DBRDM). The asymmetric FP cavity based perfect absorbers show advantages of lithography-free fabrication, excellent spectral controllability and high-resolution spectra. The Au-Al₂O₃-Au based spectrally selective emitter aimed at the absorption band of CO (~2.3 µm) with the full-width-at-half-maximum (FWHM) of ~110 nm. The 3(SiO₂-Si)- SiO₂-Al based spectral selective pyroelectric detector aimed at the absorption band of CH₄ (~3.3 µm) with very narrow FWHM of ~22 nm.