A Narrowband Mid-infrared Absorber with Tunable Peak Absorbance and Nearly Unchanged Peak Wavelength Using a Phase Changing Material

5th Annual International Workshop on Materials Science and Engineering

Ou, Chunhui^1^2^3 ; Wang, Jian^1^2^3 ; Hao, Zhibiao^1^2^3 ; Wang, Lai^1^2^3 ; Xiong, Bing^1^2^3 ; Sun, Changzheng^1^2^3 ; Han, Yanjun^1^2^3 ; Li, Hongtao^1^2^3 ; Yu, Jiadong^1^2^3 ; Luo, Yi^1^2^3

Beijing National Research Center for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing

100084, China^1

Flexible Intelligent Optoelectronic Device and Technology Center, Institute of Flexible Electronics Technology of THU, Jiaxing, Zhejiang

314006, China^2

Center for Flexible Electronics Technology, Tsinghua University, Beijing

100084, China^3

关键词: 1-D photonic crystal;    Absorption peaks;    Dielectric cavities;    High quality factors;    Infrared applications;    Phase changing materials;    Static power consumption;    Transition materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/585/1/012034/pdf
DOI  :  10.1088/1757-899X/585/1/012034

来源: IOP

【 摘 要 】

A narrowband mid-infrared (MIR) absorber with tunable peak absorbance and nearly unchanged peak wavelength is demonstrated using a phase changing material. The absorber is formed by an Au IR reflector, a SiO2 dielectric cavity and a 1D photonic crystal that consists of SiO2 and GeSbTe (GST), which is a phase-transition material and thus controls the absorbance without static power consumption. The dimension of the Au/SiO2/GST/SiO2 are optimized for high peak absorbance, high quality factor and low background absorbance. The as-fabricated absorber with amorphous GST shows the peak absorbance of 0.704 at 5.636μm, quality factor of 46.19, and background absorbance less than 0.02. Without significantly changing the absorption peak wavelength and background absorbance, the peak absorbance of the absorber can be tuned up to 4.47 dB by the phase transition of GST. Such tunable narrowband MIR absorber is a promising candidate for low-cost thermal emitter for infrared applications.