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High-speed Particle Image Velocimetry Near Surfaces
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Digital toolbox for vector field characterization.

Keshaan Singh1, Angela Dudley1

  • 1School of Physics, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

We developed a digital micro-mirror device (DMD) technique for fully characterizing vector beams. This automated method precisely measures spatial modes and polarization, advancing optical field analysis.

Keywords:
digital micro-mirror devicephase retrievalstructured lightwavefront sensing

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Area of Science:

  • Optics and Photonics
  • Quantum Information Science
  • Nanotechnology

Background:

  • Vectorial structured light fields offer unique properties for diverse applications.
  • Current methods for detecting these fields are often complex or limited in scope.
  • Nanophotonic metasurfaces enable convenient generation of these advanced optical fields.

Purpose of the Study:

  • To present a compact and automated technique for comprehensive characterization of vectorial light fields.
  • To enable simultaneous measurement of spatial modes and polarization degrees-of-freedom.
  • To overcome limitations of existing projective measurement techniques.

Main Methods:

  • Utilizing a digital micro-mirror device (DMD) for automated optical field analysis.
  • Implementing projective measurements for complete characterization of spatial and polarization states.
  • Employing a compact setup for efficient data acquisition.

Main Results:

  • Demonstrated complete, local, and global characterization of arbitrary vectorial fields.
  • Successfully identified hybrid-order Poincaré spheres and reconstructed state vectors.
  • Recovered non-separability and states-of-polarization for various vector beams.

Conclusions:

  • The developed DMD-based technique offers a powerful tool for analyzing complex optical fields.
  • This method facilitates a deeper understanding of vector beam properties and their applications.
  • The approach provides a significant advancement in optical metrology and characterization.