Multifunctional All‐Silicon Terahertz Chiral Metasurfaces via Integrated Moiré and Spin‐Decoupled Phase Engineering

ABSTRACT We present a reconfigurable all‐silicon terahertz (THz) chiral metasurface (RTCM) integrating phase‐induced chiral meta‐devices with Moiré phase engineering, to address insufficient dynamic tunability and dimension‐limited light field manipulation in existing THz metasurfaces. Conventional THz components, such as refractive lenses and off‐axis parabolic mirrors, suffer from wavefront aberrations and limited imaging resolution, while existing metasurfaces lack the ability to simultaneously deliver varifocal lensing and spin‐selective transmission. Our RTCM device adopts two cascaded metasurfaces: One with rectangular meta‐atoms enables spin‐decoupled phase modulation, embedding random phase and…

• NN
  National Natural Science Foundation of China

  Awards: 12464016 62405219, U22A2008, 12404484