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Spin-Decoupled Multifunctional Metasurface for Asymmetric Polarization Generation
journal contribution
posted on 2019-11-11, 16:04 authored by Yuehong Xu, Quan Li, Xueqian Zhang, Minggui Wei, Quan Xu, Qiu Wang, Huifang Zhang, Wentao Zhang, Cong Hu, Zhenwei Zhang, Cunlin Zhang, Xixiang Zhang, Jiaguang Han, Weili ZhangIntegrating
multiple functionalities into a single device is a
striking field in metasurfaces. One promising aspect is polarization-dependent
meta-devices enabled by simultaneous phase control over orthogonally
polarized waves. Among these, Pancharatnam-Berry (PB) metasurfaces
have drawn enormous interest owing to their natural and robust phase
control ability over different circularly polarized waves. However,
the phase responses are locked to be opposite with each other, resulting
in interrelated functionalities under the circularly polarized incidence.
Here, a generic designing method based on transmission-type dielectric
metasurfaces is proposed in the terahertz regime, which breaks this
relation by further incorporating dynamic phase with geometric phase,
namely, spin-decoupled phase control method. We demonstrate this method
by designing and characterizing an efficient multifunctional meta-grating,
which splits different circularly polarized waves to asymmetric angles
under normal incidences. More importantly, we promote this method
by designing several multiplexed meta-gratings for applications of
asymmetric polarization generation, which can convert arbitrary linearly
polarized wave to two different linearly polarized waves with nearly
equal strength and split them to asymmetric angles with a polarization-insensitive
efficiency. The designing strategy proposed here shows an impressive
robustness and a great flexibility for designing multifunctional metasurface-based
devices and opens new avenues toward modulation of polarization states
and the application of metasurfaces in beam steering and polarization
multiplexing systems.
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- Biophysics
- Space Science
- Physical Sciences not elsewhere classified
- Molecular Biology
- Biotechnology
- Evolutionary Biology
- Chemical Sciences not elsewhere classified
- Astronomical and Space Sciences not elsewhere classified
- Biological Sciences not elsewhere classified
- Mathematical Sciences not elsewhere classified
- Science Policy
Keywords
multifunctional metasurface-based devicespolarization generationAsymmetric Polarization Generation Integratingphase responsesphase control abilityphase controlPBpolarization multiplexing systemsmultifunctional meta-gratingterahertz regimepolarization-insensitive efficiencytransmission-type dielectric metasurfacesmultiplexed meta-gratingsbeam steeringpolarization-dependent meta-devicespolarization statescircularlyspin-decoupled phase control methodSpin-Decoupled Multifunctional Metasurface
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