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Light structuring via nonlinear total angular momentum addition with flat optics
Evgenii Menshikov1, Paolo Franceschini1,2, Kristina Frizyuk1
1Department of Information Engineering, University of Brescia, Via Branze, 38, Brescia, 25123, Italy.
Light, Science & Applications
|November 12, 2025
Summary
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.
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.
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