Broadband tunable absorption based on phase change materials

Results in Physics

Mingjun Wang¹  Xiaohu Wu²  Biyuan Wu² 

[1] Shandong Institute of Advanced Technology, Jinan 250100, China;School of Automation and Information Engineering, Xi’an University of Technology, Shaanxi, Xi’an 710048, China;

关键词: Tunable absorption;    Phase change materials;    Effective medium theory;   

DOI  :  

来源: DOAJ

【 摘 要 】

Tunable absorbers have been the subject of many studies in recent years. However, broadband tunable absorbers, which are promising in many applications such as photovoltaic and daytime radiative cooling systems, have not been extensively explored. In this paper, we propose a 2D periodic circular truncated cones nanostructure based on Ge2Sb2Te5 (GST) for regulating broadband absorption. When the phase of GST changes between crystalline and amorphous, the absorption can be effectively tuned over a broad bandwidth. Numerical results show that the average absorption can reach 0.968 at the crystalline phase of GST, but only 0.020 at the amorphous phase of GST in the wavelength from 8 to 15 μm. In addition, the robustness of our proposed structure to the incident angles of the incident wave is also confirmed. The physical mechanism can be explained by the effective medium theory. The magnetic field at different wavelengths are presented for a more intuitive understanding. We believe the structure proposed in this work is promising in the applications of radiative cooling and thermal camouflage.

【 授权许可】

Unknown