Efficient generation of vectorial terahertz beams using surface-wave excited metasurfaces

On-chip devices for generating pre-designed vectorial optical fields (VOFs) under surface wave (SW) excitations are highly desired in integrated photonics. However, conventional devices are usually of large footprints, low efficiencies, and limited wave-control capabilities. Here, we present a generic approach to design ultra-compact on-chip devices that can efficiently generate pre-designed VOFs under SW excitations, and experimentally verify the concept in terahertz (THz) regime. We first describe how to design SW-excitation metasurfaces for generating circularly polarized complex beams, and experimentally demonstrate two meta-devices to realize directional emission and focusing of THz waves with opposite…

• NS
  Natural Science Foundation of Shanghai

  Awards: 23dz2260100, 12221004
• NN
  National Natural Science Foundation of China

  Awards: 12374344, 62192771, 12221004
• CP
  China Postdoctoral Science Foundation

  Award: 2021TQ0077
• NK
  National Key Research and Development Program of China

  Awards: 2022YFA1204700, 2020YFA0710100