Generation of radially and azimuthally polarized vector vortex beams based on plasmonic metasurfaces
In order to meet the needs of large capacity and fast transmission and processing of informa-tion,small planar integrated optical devices are gradually replacing the traditional large-volume refractive devices.The metasurface that can manipulate light waves in sub-wavelength scale provides a new way for designing nano-device engineering and studying related physical phenomena.A plasmonic metasurface composed of orthogonal nano-slit pairs to generate radially and azimuthally polarized vector vortex beam was designed in this paper.Based on the Huygens-Fresnel principle,the wavefield expressions of the surface plasmon polariton(SPP)in the central point area of the metasurface were derived theoretically.The results were validated by performing finite-difference time-domain simulations(FDTD).In addition,this paper used a microscopic imaging system to collect the intensity pattern of the SPP field.The experi-mental doughnut-shaped radially and azimuthally polarized vector vortex was consistent with the theoreti-cal and simulated results.
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