Two-dimensional manipulation of ultraviolet Photonic Spin Hall Effect with high efficiency broadband dielectric metasurface

Abstract

Photonic Spin Hall Effect (PSHE) is a relativistic spin-orbit coupling phenomenon that can provide a wide range of spin-controlled nano-photon applications. However, most of the research results have been achieved only on 1D modulation of PSHE and the PSHE is very weak because of the extremely small spin-orbit interaction. Here, we propose a novel method to achieve a 2D manipulation of PSHE based on the broadband dielectric metasurface with refractive efficiency of above 80%. Using silicon nitride nanorods with perfect half-wave plates properties, a high-efficiency metasurface is designed, which demonstrated that directly realizes the high-performance PSHE in the ultraviolet region. Moreover, the metasurface can realize longitudinal focusing and transverse deflection of photons in different spin states by using the Pancharatnam-Berry (PB) phase and propagation phase, thus enabling 2D flexible manipulation of spin photons. The results show that the broadband dielectric metasurface offers a method to develop a high-efficiency PSHE for generating and manipulating spin-polarized photons, achieving important applications in optical communication, beam shaping, and optical sensors.