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Chinese Optics Letters, Vol. 17, Issue 5, 052303 (2019)

Multichannel high extinction ratio polarized beam splitters based on metasurfaces

Haoyu Wang1,2, Jun Zheng1,2,*, Yifei Fu3, Chengliang Wang3, Xinran Huang1,2, Zhicheng Ye3, and Liejia Qian1,2,**

Author Affiliations

  • 1Key Laboratory for Laser Plasmas (MoE) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
  • 3Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract

Separating lights into different paths according to the polarization states while keeping their respective path’s polarizations with high purification is keen for polarization multiplex in optical communications. Metallic nanowire gratings with multi-slits in a period are proposed to achieve polarized beam splitters (PBSs) in reflection and diffraction. The setting of multi-slits largely reduces the reflection of photons with a transverse magnetific field via the plasmonic waveguiding effect, which leads to highly polarized output lights with extinction ratio larger than 20 dB in each channel. The proposed reflection/diffraction PBSs enrich the approaches to control the polarization states with the advantages of wide incident angles and flexible beam splitting angles.