Metasurfaces have drawn considerable attention in manipulation of electromagnetic waves due to their exotic subwavelength footprints.Regardless of immense progress of polarization-dependent flat optics,the realization of on-device switchable complete phase multiplication is still missing from design multifunctional devices.Here,by combining geometric and propagation phases,a generalized design principle is proposed that can achieve switchable integer or fractional multiple complete phase modulation in transmitted circularly cross-polarized light by switching the handedness of incident polarization.As a proof of concept,two types of spin-dependent bifunctional wavefront manipulating devices,including switchable beam splitter/beam deflector and spin-to-orbital angular momentum converter designs are numerically realized.It is believed that the proposed single-cell spin-switchable rational-multiple complete-phase-modulation design principle based on combined propagation and geometric phases has great potential to underpin the development of meta-optics-based multi-functional operations in the field of integrated optics,imaging,and optical communication.

ATA UR RAHMAN KHALID;Fu FENG;NAEEM ULLAH;XIAOCONG YUAN;MICHAEL GEOFFREY SOMEKH

Nanophotonics Research Center,Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China;Beijing Engineering Research Center for Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Faculty of Engineering,University of Nottingham,Nottingham NG7 2RD,UK

光子学研究（英文）

[1]ATA UR RAHMAN KHALID;Fu FENG;NAEEM ULLAH;XIAOCONG YUAN;MICHAEL GEOFFREY SOMEKH-.Exploitation of geometric and propagation phases for spin-dependent rational-multiple complete phase modulation using dielectric metasurfaces)[J].光子学研究（英文）,2022(04):877-885

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