摘要
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 spinto-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 multifunctional operations in the field of integrated optics, imaging, and optical communication.
基金
Shenzhen University Starting Fund(2019073)
National Natural Science Foundation of China(61905147,61935013,91750205,U1701661)
Leading Talents Program of Guangdong Province(00201505,2019JC01Y178)
Natural Science Foundation of Guangdong Province(2016A030312010,2019TQ05X750,2020A1515010598)
Science,Technology and Innovation Commission of Shenzhen Municipality(JCYJ20180507182035270,KQTD2017033011044403,KQTD20180412181324255).