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Optical Gap-Surface Plasmon Metasurfaces for Spin-Controlled Surface Plasmon Excitation and Anomalous Beam Steering
journal contribution
posted on 2020-07-01, 19:15 authored by Chao Meng, Shiwei Tang, Fei Ding, Sergey I. BozhevolnyiMultifunctional
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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spin-decoupled multifunctional gap-...photonicfree-propagating beam steeringorthogonalrightSPP excitationchiropticalAnomalous Beam Steering Multifuncti...Optical Gap-Surface Plasmon Metasur...spin-controlledbeam steeringCP incident lightspin-decoupled GSP gradient metasurfacespectroscopyCP light incidenceSpin-Controlled Surface Plasmon Exc...phaseGSP-based nanoscale half-wave platessurface plasmon polariton
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