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Light structuring via nonlinear total angular momentum addition with flat optics.

Evgenii Menshikov1, Paolo Franceschini1,2, Kristina Frizyuk1

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Researchers demonstrated non-trivial structuring of third-harmonic light using nonlinear flat optics. This advancement in structured light generation is sensitive to pump polarization, opening new avenues for optical control.

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Area of Science:

  • Nonlinear optics
  • Flat optics
  • Structured light generation

Background:

  • Flat optical devices have advanced light-matter interactions and applications.
  • Generating structured light beyond the linear regime remains a challenge.
  • Nonlinear optical interactions offer new functionalities for structured light.

Purpose of the Study:

  • To experimentally demonstrate non-trivial structuring of third-harmonic light.
  • To explore the role of total angular momentum projection in nonlinear flat optics.
  • To investigate the sensitivity of structured light to pump polarization.

Main Methods:

  • Utilized a nonlinear, isotropic flat optics element (amorphous silicon thin film).
  • Experimentally generated and analyzed third-harmonic light.
  • Employed a theoretical approach with numerical simulations for quantitative predictions.

Main Results:

  • Successfully demonstrated non-trivial structuring of third-harmonic light.
  • Identified total angular momentum projection and helicity as critical analysis properties.
  • Revealed high sensitivity of third-harmonic light shape to pump polarization state.

Conclusions:

  • Harnessing total angular momentum projection in nonlinear wave mixing is effective for generating controlled structured light.
  • Nonlinear flat optics provides a powerful platform for advanced light structuring.
  • Findings enable new strategies for structured light generation and detection.