Ultraviolet metalens and metalens array of focused vortex beams

• Published in: Chinese physics B Vol. 32; no. 6; pp. 64206 - 312
• Main Authors: Zhang, Jinping, Wang, Yan, Yuan, Huan, Wang, Zehao, Deng, Yang, Huang, Chengzhi, Wu, Jiagui, Yang, Junbo
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.06.2023; Center of Material Science,National University of Defense Technology,Changsha 410073,China%Center of Material Science,National University of Defense Technology,Changsha 410073,China; School of Physical Science and Technology,Southwest University,Chongqing 400715,China; College of Artificial Intelligence,Southwest University,Chongqing 400715,China%Center of Material Science,National University of Defense Technology,Changsha 410073,China%School of Physical Science and Technology,Southwest University,Chongqing 400715,China%Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University),Ministry of Education,College of Pharmaceutical Sciences,Southwest University,Chongqing 400715,China
• Subjects: metalens; metamaterials; ultraviolet (UV); vortex beams; metamaterials; metalens; ultraviolet(UV); vortex beams
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/ac9d87

The solar-blind ultraviolet (UV) wavelength is particularly interesting within the range of 200 nm–300 nm. Here, we propose a focusing metalens, focusing vortex beam (VB) metalens and metalens array that specifically work in the UV band to focus a beam or VB. Firstly, a high numerical aperture (NA) focusing metalens working at a wavelength of 214.2 nm was designed, and the NA reached 0.83. The corresponding conversion efficiency of the unit structure reached as high as 94%, and the full width at half maximum was only 117.2 nm. Metalenses with large NA can act as optical tweezers and can be applied to trap ultracold atoms and molecules. Secondly, a focused VB metalens in the wavelength range of 200 nm–300 nm was also designed, which can convert polarized light into a VB and focus the VB simultaneously. Finally, a metalens array was developed to focus VBs with different topological charges on the same focal plane. This series of UV metalenses could be widely used in UV microscopy, photolithography, photonics communication, etc.