Open AccessTriple-layer Fabry-Perot absorber with near-perfect absorption in visible and near-infrared regime
Author(s) -
Shiwei Shu,
Zhe Li,
Yang Yang Li
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.025307
Subject(s) - materials science , optics , absorption (acoustics) , dielectric , layer (electronics) , fabry–pérot interferometer , optoelectronics , visible spectrum , wavelength , nanotechnology , physics , composite material
A simple absorber design which enables near-perfect absorption in the visible and near-infrared regions is presented. The absorber is an unpatterned metal/dielectric/metal triple-layer, e.g., a 20 nm-thick metal film as the top layer, a 250 nm-thick dielectric film as the middle layer, and a 200 nm-thick metal film as the bottom layer. It was found that the high-efficiency absorption at specific wavelengths is mainly due to the Fabry-Perot (FP) resonances in the dielectric middle layer which result in trapping of the resonant light in the middle layer and thus enhanced absorption efficiency.