Titanium dioxide metasurface manipulating high-efficiency and broadband photonic spin Hall effect in visible regime

Nanophotonics

article

Wei Zhu¹  Quanhong Fu²  Fuli Zhang²  Changzhi Gu¹  Junjie Li¹  Ruisheng Yang²  Guangzhou Geng¹  Yuancheng Fan²  Xuyue Guo²  Peng Li² 

[1] Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences;School of Physical Science and Technology and Shenzhen Research and Development Institute, Northwestern Polytechnical University;Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Department of Applied Physics, School of Science, Northwestern Polytechnical University;School of Physical Sciences, CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences;Songshan Lake Materials Laboratory

关键词: high-efficiency metasurface;    photonic spin Hall effect;    spin-dependent trajectory propagation;    spin-orbit coupling;   

DOI  :  10.1515/nanoph-2020-0290

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

The interactions of photonic spin angular momentum and orbital angular momentum, i.e., the spin-orbit coupling in focused beams, evanescent waves or artificial photonic structures, have attracted intensive investigations for the unusual fundamental phenomena in physics and potential applications in optical and quantum systems. It is of fundamental importance to enhance performance of spin-orbit coupling in optics. Here, we demonstrate a titanium dioxide (TiO 2 )–based all-dielectric metasurface exhibiting a high efficient control of photonic spin Hall effect (PSHE) in a transmissive configuration. This metasurface can achieve high-efficiency symmetric spin-dependent trajectory propagation due to the spin-dependent Pancharatnam-Berry phase. The as-formed metadevices with high-aspect-ratio TiO 2 nanofins are able to realize (86%, measured at 514 nm) and broadband PSHEs in visible regime. Our results provide useful insights on high-efficiency metasurfaces with versatile functionalities in visible regime.

【 授权许可】

CC BY