2023, Volume 29, Issue 10
Engineering >> 2023, Volume 29, Issue 10 doi: 10.1016/j.eng.2022.10.005
Transparent Thermally Tunable Microwave Absorber Prototype Based on Patterned VO2 Film
a Ultra-Precision Optical & Electronic Instrument Engineering Center, Harbin Institute of Technology, Harbin 150001, China
b Key Laboratory of Ultra-Precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150001, China
c Center for Composite Material and structure, Harbin Institute of Technology, Harbin 150001, China
Next Previous
Abstract
Transparent microwave absorbers that exhibit high optical transmittance and microwave absorption capability are ideal, although having a fixed absorption performance limits their applicability. Here, a simple, transparent, and thermally tunable microwave absorber is proposed, based on a patterned vanadium dioxide (VO2) film. Numerical calculations and experiments demonstrate that the proposed VO2 absorber has a high optical transmittance of 84.9% at 620 nm; its reflection loss at 15.06 GHz can be thermally tuned from –4.257 to –60.179 dB, and near-unity absorption is achieved at 523.75 K. Adjusting only the patterned VO2 film duty cycle can change the temperature of near-unity absorption. Our VO2 absorber has a simple composition, a high optical transmittance, a thermally tunable microwave absorption performance, a large modulation depth, and an adjustable temperature tuning range, making it promising for application in tunable sensors, thermal emitters, modulators, thermal imaging, bolometers, and photovoltaic devices.
Keywords
Tunable microwave absorber ; VO2 film ; Optical transparent ; Near unity absorption ; Large modulation depth
SupplementaryMaterials
京公网安备 11010502051620号
