Issue 7, 2022

A voltage-controllable VO2 based metamaterial perfect absorber for CO2 gas sensing application

Abstract

Vanadium dioxide (VO2) based metamaterial perfect absorbers (MPAs) have high potential application values in sensing gas molecules. However, a tuning mechanism via temperature manipulation lacks the compatibility with electronic devices. In this study, a voltage-controllable device is proposed by integrating an MPA and micro-electro-mechanical system (MEMS) based microheater for CO2 gas sensing application. The MPA is composed of a metal–dielectric–metal (MDM) structure and tailored to form an H-shaped metamaterial. The central bar of the H-shaped metamaterial is composed of a VO2 material, which exhibits perfect absorption in the CO2 gas absorption spectrum, i.e., at a wavelength of 2.70 μm. The intergated microheater is patterned by using fractal theory to provide high heating temperature and high uniformity of surface temperature. By precisely driving a DC bias voltage on the microheater, the MPA is heated and it can exhibit switchable optical properties with high efficiency. These results provide a strategy to open an avenue for sensors, absorbers, switches, and programmable devices in infrared wavelength range applications.

Graphical abstract: A voltage-controllable VO2 based metamaterial perfect absorber for CO2 gas sensing application

Article information

Article type
Paper
Submitted
24 nov 2021
Accepted
12 jan 2022
First published
12 jan 2022

Nanoscale, 2022,14, 2722-2728

A voltage-controllable VO2 based metamaterial perfect absorber for CO2 gas sensing application

X. Xu, R. Xu and Y. Lin, Nanoscale, 2022, 14, 2722 DOI: 10.1039/D1NR07746E

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