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Tailoring full-Stokes thermal emission from twisted-gratings structures.

Chiyu Yang1, Wenshan Cai2, Zhuomin M Zhang1

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|December 5, 2024
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Summary
This summary is machine-generated.

Researchers developed a novel silicon carbide grating microstructure for full-Stokes thermal emission control. This breakthrough enables continuous tuning of polarization states, crucial for advanced remote sensing and biomedical applications.

Keywords:
circular polarizationfull-Stokes thermal emissionmetamaterialtwisted gratings

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Polarized thermal emission is vital for remote sensing, landmine detection, and target identification.
  • Controlling polarization states across the full Stokes parameters is essential for applications like ellipsometry and biomedical analysis.
  • Existing metamaterial studies primarily focus on linear or circular polarization, leaving full-Stokes control unexplored.

Purpose of the Study:

  • To propose and demonstrate a microstructure capable of tailoring thermal emission polarization across the full Stokes parameter range.
  • To achieve continuous tunability of the emission polarization state.
  • To provide a novel design for advanced thermal emission control.

Main Methods:

  • Fabrication of a microstructure using two layers of silicon carbide gratings.
  • Utilizing a bilayer twisted-gratings structure to break mirror symmetry.
  • Leveraging wave interference and diffraction effects for enhanced emission dichroism.

Main Results:

  • The proposed microstructure successfully tailors thermal emission polarization over the full Stokes parameter range.
  • The bilayer structure results in almost completely polarized emission.
  • Adjusting the twist angle between gratings allows continuous tuning from linear to circular polarization, covering nearly the entire Poincaré sphere.

Conclusions:

  • The developed silicon carbide grating microstructure offers a new method for full-Stokes thermal emission control.
  • This design provides significant advantages over existing plasmonic metasurfaces for polarization manipulation.
  • The study opens avenues for enhanced performance in polarization-dependent optical applications.