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This study introduces an all-silicon metasurface that converts arbitrary polarized light into circular polarization in the terahertz range. This breakthrough enables advanced control for miniaturized terahertz devices.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Polarization control is essential for manipulating light-matter interactions.
  • Miniaturized terahertz (THz) devices require advanced control over arbitrarily polarized waves.
  • Metasurfaces offer unprecedented capabilities for wave manipulation.

Purpose of the Study:

  • To demonstrate an all-silicon metasurface for converting arbitrary polarization states to circular polarization in the THz band.
  • To show controllable conversion intensities based on polarization evolution on the Poincaré sphere.
  • To explore the potential of metasurfaces for chiral wavefront manipulation.

Main Methods:

  • Utilized monolayer achiral meta-atoms for mutual interference.
  • Investigated polarization conversion using the Poincaré sphere.
  • Employed the geometric phase principle for chiral wavefront manipulation.

Main Results:

  • Achieved conversion of arbitrary incident polarization to circular polarization in the THz band.
  • Demonstrated controllable conversion intensities.
  • Observed broadband circular dichroism (BCD) due to spin-selective interference.
  • Experimentally verified theoretical derivations.

Conclusions:

  • The proposed all-silicon metasurface offers a versatile platform for polarization control in the THz range.
  • This ultrathin meta-platform can replace bulky optical components.
  • Potential applications include chiral spectroscopy, imaging, and optical communication.