Open AccessExperimental investigation of multiple near-perfect absorptions in sandwich structures containing thin metallic films
Author(s) -
Bin Liu,
Guang Lu,
Liyong Cui,
Jin Li,
Feng Sun,
Liu Fen,
Yanhui Li,
Tianlin Yang,
Guiqiang Du
Publication year - 2017
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.25.013271
Subject(s) - materials science , optics , absorption (acoustics) , dielectric , wavelength , photonic crystal , thin film , fabrication , near and far field , optoelectronics , physics , nanotechnology , medicine , alternative medicine , pathology
We experimentally investigated near-perfect optical absorption in sandwich structures comprising a thin metallic film whose thickness is larger than the skin depth, a top dielectric layer and a truncated photonic crystal. Single and multiple near-perfect absorptions were realized by tuning the thickness of the top layer. Based on the electromagnetic field intensity distributions at the absorption wavelengths, single near-perfect absorption originated from the tunneling effect of the optical Tamm state, while multiple near-complete absorptions mainly originated from Fabry-Perot resonances. Additionally, the structures showed good one-way absorption properties. The experimental results agreed well with theoretical values. These structures may be important for the fabrication of single or multichannel perfect absorbers.