Design of aluminum nitride metalens for broadband ultraviolet incidence routing

Nanophotonics

article

Linhao Guo¹  Wenhui Zhu¹  Liancheng Wang¹  Zelin Hu¹  Rongqiao Wan¹  Linyun Long¹  Tao Li¹  Jianchang Yan²  Yun Lin³  Lei Zhang¹ 

[1] State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University;Research and Development Center for Semiconductor Lighting, Chinese Academy of Sciences;Xiangya School of Stomatology, Xiangya Stomatological Hospital, Central South University

关键词: metalens;    ultraviolet spectrum;    aluminum nitride;    router;   

DOI  :  10.1515/nanoph-2018-0151

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Ultraviolet (UV) photonics-based device and equipment have various applications in sterilization, military covert communication, medical treatment, nanofabrication, gem identification and so on. The traditional constituent UV components are bulky, inefficient, expensive and easily aging under UV radiation. An all-dielectric metasurface offers a promising way to control the amplitude, polarization and phase of light by engineering the size, shape and distribution of its constituent elements. However, UV components based on all-dielectric metasurfaces are difficult to be realized, due to significant absorption loss for most dielectric materials at the UV region. Here we demonstrate the design of a UV metalens, composed of high-aspect-ratio aluminum nitride nanorods. The in-plane on-axis, off-axis and out-of-plane focusing characteristics have been investigated at representative UVA (375 nm), UVB (308 nm) and UVC (244 nm) wavelengths, respectively. Furthermore, we design UV router for mono-wavelength and multiple wavelengths, that is, guiding UV light to designated different spatial positions. Our work is promising for the development of UV photonic devices and would facilitate the integration and miniaturization of the UV nanophotonics.

【 授权许可】

CC BY