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Coherence vortices by binary pinholes.

Akanksha Gautam1, Amit K Agarwal2, Rakesh Kumar Singh1

  • 1Laboratory of Information Photonics and Optical Metrology, Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.

Nanophotonics (Berlin, Germany)
|December 16, 2024
PubMed
Summary
This summary is machine-generated.

Researchers created coherence vortices with tunable orbital angular momentum (OAM) using structured binary pinholes. This novel method generates pure OAM modes and photonic gears from incoherent light sources.

Keywords:
coherence vorticesorbital angular momentumspatial coherencetopological charge

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Area of Science:

  • Optics and Photonics
  • Quantum Information Science

Background:

  • Coherence vortices, singularities in the spatial coherence function, exhibit zero visibility and helical phase structures.
  • These vortices are crucial for understanding light's complex behavior and have potential applications in optical manipulation and communication.

Purpose of the Study:

  • To introduce a novel technique for generating coherence vortices with controllable topological charges.
  • To explore the creation of pure orbital angular momentum (OAM) modes and photonic gears using incoherent light.

Main Methods:

  • Fabrication of exotic structured binary pinholes using lithography and wet etching.
  • Controlling light transmittance from an incoherent source plane using these custom apertures.
  • Analysis of the two-point complex spatial coherence function to characterize the generated vortices.

Main Results:

  • Successful generation of coherence vortices with varying topological charges.
  • Observation of multiple and pure orbital angular momentum (OAM) modes in the coherence vortex spectrum.
  • Demonstration of photonic gears by superposing OAM modes with opposite topological charges.

Conclusions:

  • The proposed method offers a versatile platform for generating tailored coherence vortex states.
  • The technique provides a new route for manipulating light's spatial coherence properties for advanced optical applications.