標題: Nonradiating Silicon Nanoantenna Metasurfaces as Narrowband Absorbers
作者: Yang, Chi-Yin
Yang, Jhen-Hong
Yang, Zih-Ying
Zhou, Zhong-Xing
Sun, Mao-Guo
Babicheva, Viktoriia E.
Chen, Kuo-Ping
光電系統研究所
照明與能源光電研究所
影像與生醫光電研究所
Institute of Photonic System
Institute of Lighting and Energy Photonics
Institute of Imaging and Biomedical Photonics
關鍵字: high-refractive-index (HRI);dielectric nanoantennas;metasurfaces;absorber
公開日期: 1-Jul-2018
摘要: High-refractive-index (HRI) nanostructures support optically induced electric dipole (ED) and magnetic dipole (MD) modes that can be used to control scattering and achieve narrowband absorption. In this work, a high-absorptance device is proposed and realized by using amorphous silicon nanoantenna (a-Si NA) arrays that suppress backward and forward scattering with engineered structures and in particular periods. The overlap of ED and MD resonances, by designing an array with a specific period and exciting lattice resonances, is experimentally demonstrated. The absorptance of a-Si NA arrays increases 3-fold in the near-infrared range in comparison to unpatterned silicon films. Nonradiating a-Si NA arrays can achieve high absorptance with a small resonance bandwidth (Q = 11.89) at a wavelength of 785 nm. The effect is observed not only due to the intrinsic loss of material but by overlapping the ED and MD resonances.
URI: http://dx.doi.org/10.1021/acsphotonics.7b01186
http://hdl.handle.net/11536/147895
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.7b01186
期刊: ACS PHOTONICS
Volume: 5
起始頁: 2596
結束頁: 2601
Appears in Collections:Articles