期刊
ACS PHOTONICS
卷 7, 期 7, 页码 1849-1856出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c00681
关键词
gap-surface plasmon metasurface; spin-decoupled; multifunctional; phase gradient; surface plasmon excitation; beam steering
类别
资金
- European Research Council [341054]
- Villum Kann Rasmussen Foundation
- Villum Experiment from the Villum Fonden [00022988]
- MULTIPLY fellowship under the Marie Sklodowska-Curie COFUND Action [713694]
- National Natural Science Foundation of China [11604167]
- Zhejiang Province Natural Science Foundation of China [LY19A040004]
Multifunctional metasurfaces featuring diversified functionalities offer unprecedented possibilities for developing versatile ultracompact micro/nanophotonic devices and systems. Until recently, most multifunctional metasurfaces were designed for light incidence with orthogonal linear polarizations, being unable to function with orthogonal circularly polarized (CP) light, which is of vital importance in spin photonics, chiroptical spectroscopy/imaging, and optical sensing. Here we consider the design of efficient spin-decoupled multifunctional gap-surface plasmon (GSP) gradient metasurfaces and experimentally demonstrate simultaneous spin-controlled unidirectional surface plasmon polariton (SPP) excitation and anomalous beam steering in the optical regime under orthogonal right and left CP light incidence, respectively. The spin-decoupled GSP gradient metasurface, consisting of rotated GSP-based nanoscale half-wave plates, combines both propagation and geometric phases to produce two different spin-dependent linear phase gradients enabling SPP excitation and anomalous reflection. The proof-of-concept fabricated metasurface exhibits broadband (850-950 nm) operation featuring efficient (>22%) unidirectional SPP excitation and high-efficiency (48% on average) anomalous beam steering for right and left CP incident light, respectively. Our demonstration of metasurface-enabled spin-controlled unidirectional SPP excitation along with free-propagating beam steering opens new possibilities for spin photonics and plasmonics with potential applications ranging from biomedical diagnosis, chiroptical spectroscopy, and imaging to optical sensing.
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