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Hybrid Nonlinear Metasurface Refractive Lens.
Sharon Karepov1,2, Costantino De Angelis3, Tal Ellenbogen1,2
1Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel.
Nano Letters
|April 3, 2025
Summary
Researchers developed hybrid nonlinear meta-lenses by coating linear lenses with nonlinear metasurfaces. This novel approach enables new ways to generate and focus light at the second harmonic frequency for advanced optical applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Nonlinear metasurfaces offer advanced light generation and control.
- Traditional nonlinear metasurfaces are fabricated on planar substrates.
- Encoding functionality solely in metasurface design limits integration.
Purpose of the Study:
- To explore a novel route for nonlinear metasurface-based optics.
- To create hybrid nonlinear refractive elements by combining linear optics with nonlinear metasurfaces.
- To demonstrate a functional hybrid nonlinear meta-lens.
Main Methods:
- Coating a plano-convex linear refractive lens with a conformable nonlinear metasurface membrane (400 nm thick).
- Characterizing the hybrid meta-lens's optical performance.
- Analyzing spectral and polarization responses.
Main Results:
- The hybrid meta-lens successfully generated light at the second harmonic frequency.
- The element focused light according to its combined linear and nonlinear optical properties.
- An image was generated at the second harmonic wavelength, demonstrating functional imaging capabilities.
Conclusions:
- This work introduces a new class of hybrid nonlinear refractive elements.
- Coating linear optics with nonlinear metasurfaces provides a versatile platform.
- This approach opens avenues for novel light control in diverse applications.
