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Optical Polarization Sensor Based on a Metalens.

Victor Kotlyar1,2, Anton Nalimov1,2, Alexey Kovalev1,2

  • 1IPSI RAS-Branch of the FSRC "Crystallography and Photonics" RAS, Molodogvardeyskaya 151, 443001 Samara, Russia.

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|October 27, 2022
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Summary
This summary is machine-generated.

This study introduces a novel metalens-based optical microsensor for laser light polarization. It uniquely generates distinct focal patterns for different polarization states, enabling precise polarization analysis.

Keywords:
high-aperture metalenspolarization sensorsharp focusingtopological charge

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Metasurface-based polarization sensors typically deflect light at various angles.
  • Existing methods face limitations in generating distinct, pattern-based polarization discrimination.

Purpose of the Study:

  • To develop a novel optical microsensor for laser light polarization detection using a metalens.
  • To demonstrate a new principle for polarization sensing based on focal pattern generation.

Main Methods:

  • Design and simulation of a metalens for polarization-dependent focal pattern generation.
  • Fabrication of the metalens in an amorphous silicon film.
  • Experimental characterization of focal patterns for different polarization states.

Main Results:

  • Left circular polarization produced a focal ring.
  • Right circular polarization resulted in a circular focal spot.
  • Linear polarization generated an elliptical spot with two sidelobes, with its tilt angle matching the polarization angle.

Conclusions:

  • The developed metalens-based microsensor effectively distinguishes various polarization states through unique focal patterns.
  • This approach offers a promising alternative to angle-deflection-based polarization sensors.
  • The fabricated metalens demonstrates high performance with a short focal distance and high numerical aperture.