Journal
NANOPHOTONICS
Volume 9, Issue 14, Pages 4327-4335Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0290
Keywords
high-efficiency metasurface; photonic spin Hall effect; spin-dependent trajectory propagation; spin-orbit coupling
Categories
Funding
- National Key R&D Program of China [2016YFA0200800, 2016YFA0200400]
- Natural Science Foundation of China (NSFC) [61771402, 11674266, 11674387, 11574369, 91323304, 11574368, 11574385, 61888102]
- Key Research Program of Frontier Sciences of CAS [QYZDJ-SSW-SLH042]
- Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20170817162221169]
- Hong Kong Scholars Program [XJ2017006]
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The interactions of photonic spin angular momentum and orbital angular momentum, i.e., the spinorbit 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 (TiO2)-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 PancharatnamBerry phase. The as-formed metadevices with high-aspect-ratio TiO2 nanofins are able to realize (86%, measured at 514 nm) and broadband PSHEs in visible regime. Our results provide useful insights on highefficiency metasurfaces with versatile functionalities in visible regime.
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