Design of aluminum nitride metalens for broadband ultraviolet incidence routing
Guo Linhao,
Hu Zelin,
Wan Rongqiao,
Long Linyun,
Li Tao,
Yan Jianchang,
Lin Yun,
Zhang Lei,
Zhu Wenhui,
Wang Liancheng
Affiliations
Guo Linhao
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Hu Zelin
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Wan Rongqiao
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Long Linyun
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Li Tao
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Yan Jianchang
Research and Development Center for Semiconductor Lighting, Chinese Academy of Sciences, No. 35A Qinghua East Road, Beijing 100083, China
Lin Yun
Xiangya School of Stomatology, Xiangya Stomatological Hospital, Central South University, Changsha Hunan, 410000, China
Zhang Lei
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Zhu Wenhui
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China
Wang Liancheng
State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha Hunan, 410083, China, e-mail: [email protected]
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.
