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Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
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Second-Harmonic Generation in Resonant Nonlinear Metasurfaces Based on Lithium Niobate
Anna Fedotova1, Mohammadreza Younesi1, Jürgen Sautter1
1Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany.
Nano Letters
|November 12, 2020
Summary
Researchers fabricated resonant nonlinear metasurfaces using thin-film lithium niobate for enhanced second-harmonic generation. Electric-dominated Mie resonances maximized efficiency by optimizing nonlinear susceptibility tensor usage.
Area of Science:
- Photonics and Nanophotonics
- Nonlinear Optics
- Materials Science
Background:
- Lithium niobate is a key material for nonlinear frequency conversion.
- Metasurfaces offer novel ways to control light-matter interactions.
- Second-harmonic generation (SHG) is a fundamental nonlinear optical process.
Purpose of the Study:
- To fabricate and investigate resonant nonlinear metasurfaces for SHG.
- To explore enhanced SHG using Mie resonances in thin-film lithium niobate.
- To understand the role of different nonlinear susceptibility tensor elements in SHG.
Main Methods:
- Fabrication of thin-film lithium niobate metasurfaces.
- Experimental investigation of Mie-type resonances.
- Polarization-resolved second-harmonic generation measurements.
Main Results:
- Pronounced Mie-type resonances observed in the metasurfaces.
- Enhanced second-harmonic generation in the direction normal to the metasurface.
- Maximized SHG efficiency for electric-dominated resonances due to optimal nonlinear susceptibility tensor utilization.
Conclusions:
- Lithium niobate metasurfaces enable enhanced SHG.
- Mie resonances significantly boost nonlinear frequency conversion.
- This work promotes lithium niobate for resonant nanophotonics applications.
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