Multi-spectral programmable absorbers
Abstract
We designed and demonstrated a multi-spectral programmable perfect absorber that exploits two different phase-change materials. This programmability is possible by resonantly coupling two phase change materials, a Ge2Sb2Te5 layer to vanadium dioxide nanoparticles (VO2 NPs). The perfect absorption is attributed to the coalescence of gap plasmon modes excited between the NPs and waveguide cavity-like modes excited between the film and the NPs. The absorptance peak (>90%) can be tuned to four different infrared (IR) wavelengths from 1906 to 2960 nm by heating the structure to different temperatures. The perfect absorber is reconfigurable, lithography-free, large-scale, polarization-insensitive omnidirectional. Our strategy opens a new path for programmable infrared photonics.
Cite
@article{arxiv.2106.06940,
title = {Multi-spectral programmable absorbers},
author = {Yun Meng and Dan Li and Chong Zhang and Yang Wang and Robert E. Simpson and Yi Long},
journal= {arXiv preprint arXiv:2106.06940},
year = {2021}
}