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Second harmonic generation in monolithic lithium niobate metasurfaces.
Optics Express
|December 28, 2019
Summary
Researchers developed a new type of nonlinear metasurface using monolithic Lithium Niobate. This design enhances second harmonic generation, paving the way for advanced nonlinear and quantum light sources.
Area of Science:
- Photonics and Metamaterials
- Nonlinear Optics
Background:
- Second-order nonlinear metasurfaces enable efficient frequency conversion at the subwavelength scale.
- Existing metasurfaces are limited by III-V semiconductors, restricting material choice and optical properties.
Purpose of the Study:
- To propose a new design concept for second-order nonlinear metasurfaces applicable to any non-centrosymmetric material.
- To demonstrate this concept using a monolithic Lithium Niobate metasurface.
Main Methods:
- Designed a monolithic Lithium Niobate metasurface with cylinder-shaped corrugations.
- Optimized geometrical parameters for enhanced field confinement.
- Investigated second harmonic generation from a near-infrared pump beam.
Main Results:
- Achieved enhanced second harmonic generation with a conversion efficiency exceeding 10-5.
- Utilized a pump intensity of 1 GW/cm2.
- Demonstrated the effectiveness of the monolithic design for nonlinear light generation.
Conclusions:
- The proposed metasurface design overcomes limitations of thin crystalline films and material availability.
- This approach offers a versatile platform for practical nonlinear and quantum light sources.
- Monolithic Lithium Niobate metasurfaces show significant potential for future photonic applications.
