Photonics Research, 2020, 8 (3): 03000426, Published Online: Feb. 28, 2020
Ultra-broadband reflector using double-layer subwavelength gratings Download: 704次
Abstract
Double-layer high-contrast subwavelength gratings that are separated by a dielectric space layer are investigated to achieve ultra-broadband reflection. The reflection phase of subwavelength gratings and the propagation phase shift between two gratings are manipulated to expand reflection bandwidth by properly stacking two reflective gratings. A reflector exhibiting a 99% reflectance bandwidth of in the near-infrared is designed. Then this reflector is prepared using laser interference lithography and ion beam planarization, and an ultra-broadband reflection is achieved with reflectance exceeding 97% over a wavelength range of 955 nm in the near-infrared region.
Jinlong Zhang, Shuaikai Shi, Hongfei Jiao, Xiaochuan Ji, Zhanshan Wang, Xinbin Cheng. Ultra-broadband reflector using double-layer subwavelength gratings[J]. Photonics Research, 2020, 8(3): 03000426.