Title
Broadband thin-film and metamaterial absorbers using refractory vanadium nitride and their thermal stability
Document Type
Article
Publication Date
10-11-2021
Abstract
Strong absorption of the full spectrum of sunlight at high temperatures is desired for photothermal devices and thermophotovoltaics. Here, we experimentally demonstrate a thin-film broadband absorber consisting of a vanadium nitride (VN) film and a SiO2 anti-reflective layer. Owing to the intrinsic high loss of VN, the fabricated absorber exhibits high absorption over 90% in the wide range of 400-1360 nm. To further enhance the near-infrared absorption, we also propose a metamaterial absorber by depositing patterned VN square patches on the thin-film absorber. An average absorption of 90.4% over the range of 400-2500 nm is achieved due to the excitation of broad electric dipole resonance. Both thin-film and metamaterial absorbers are demonstrated to possess excellent incident angle tolerances (up to 60°) and superior thermal stability at 800 ℃. The proposed refractory VN absorbers may be potentially used for solar energy harvesting, thermal emission, and photodetection.
Recommended Citation
Wang, Wenhao; Wang, Hanbin; Yu, Peng; Sun, Kai; Tong, Xin; Lin, Feng; Wu, Cuo; You, Yimin; Xie, Wuze; Li, Yunpeng; Yuan, Chenzhi; Govorov, Alexander O.; Muskens, Otto L.; Xu, Hongxing; Sun, Song; and Wang, Zhiming, "Broadband thin-film and metamaterial absorbers using refractory vanadium nitride and their thermal stability" (2021). Physics & Astronomy Open Access Publications. 180.
https://ohioopen.library.ohio.edu/physics-astronomy-oapub/180