摘要
Photonic spin Hall efect(SHE)provides new opportunities for achieving spin-based photonics applications.However,flexibly manipulating the spin-dependent sltting(SDS)of photonic SHE and imposing extra phase modulation on the two spin components are always a challenge.Here,a controllable SHE mechanism based on phase function construction is reported.It is conduded that the phases with specific functional structures performing a coordinate translation are equivalent to integrating a gradient phase to the original phases.Hence,the original phase can be used for independent phase modulation,and the gradient phase originating from the co-ordinate translation is capable of manipulating the SDS.A metasurface with Pancharatnam-Berry phase that can impose conjugate phases to the two spin components of light is fabricated to verify this mechanism.By shifing the light position,the SDS is continuously manipulated in the visible region,which is successfully used for detecting the polarization llipticity.The extra phase modulation is also performed with the original phase and thus enables measuring singular beams.It is anticipated that the controllable SHE manipulation method may open new avenues in the fields of spin photonics,optical sensing,optical communications,etc.
基金
Program of Fundamental Rescarch of Science and Technology Planning Project of Shenzhen Munipality(JCYJ20180507182035270)
Science and Technology Planning Project of Guangdong Province(2016B050501005)
Science and Technology Project of Shenzhen(ZDSYS201707271014468)
International Collaborative Laboratory of 2D Materials for Opeoelectronics Science and Technology(2DMOST2018003)
National Natural Science Foundation of China(61805087,61805149)
Natural Science Foundation of Guangdong Province(2016A030310065,2018A030313368,2020A1515011392).