Abstract

We demonstrate a single-layer metasurface structure to achieve broadband near-perfect absorption at visible light to near-infrared wavelengths. The nanoposts with two different sizes in one unit cell excite the Mie resonances, thereby causing incident light to be efficiently coupled to the loss substrate and further enhance absorption. The metasurface and the supporting substrate are composed of the homogeneous material germanium. Broadband absorption can be achieved due to the coupling and overlapping of different orders of Mie resonances. The average absorption is 96% at wavelengths ranging from 400 to 1300 nm. The structure is polarization independent due to its ${{\rm C}_4}$ symmetry. Our proposed structure also achieves an average absorption efficiency of 92% when the incident angle is up to 50°. This work may provide a paradigm for designing high-performance single-layer perfect absorbers, which is potentially applicable in advanced optical capture, integrated photon systems, and optoelectronic devices.

© 2021 Optica Publishing Group

Wafer-scale ultra-broadband perfect absorber based on ultrathin Al-SiO₂ stack metasurfaces

Hong Li, Cheng Zhang, Xian Chao Liu, Peng Yu, Wei Dong Chen, Zheng Wei Xie, Ming Jun Tang, Jie Zheng, and Ling Li
Opt. Express 30(17) 30911-30917 (2022)

Enhanced absorption based on gap-plasmon resonance and Fabry–Perot resonance in a refractory metasurface

Dewang Huo, Hang Su, Chao Wang, Xinyan Ma, and Hua Zhao
J. Opt. Soc. Am. B 38(4) 1350-1358 (2021)

Polarization- and angle-insensitive ultrabroadband perfect metamaterial absorber for thermophotovoltaics

Ashish Kumar Chowdhary, Tanmay Bhowmik, and Debabrata Sikdar
J. Opt. Soc. Am. B 38(2) 327-335 (2021)

Ultra-broadband solar absorber based on multi-layer TiN/TiO₂ structure with near-unity absorption

Samira Mehrabi, Mir Hamid Rezaei, and Abbas Zarifkar
J. Opt. Soc. Am. B 36(9) 2602-2609 (2019)

Ultra-broadband perfect absorber using triple-layer nanofilm in a long-wave near-infrared regime

Kaili Kuang, Qiao Wang, Xiaomin Yuan, Li Yu, Yuzhang Liang, Yang Zhang, and Wei Peng
Appl. Opt. 61(26) 7706-7712 (2022)