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Second harmonic generation in monolithic lithium niobate metasurfaces

Carletti L, Li C, Sautter J, Staude I, De Angelis C, Li T, Neshev DN (2019)

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Publication Type: Journal article

Publication year: 2019

Journal

Book Volume: 27

Pages Range: 33391-33398

Journal Issue: 23

DOI: 10.1364/OE.27.033391

Abstract

Second-order nonlinear metasurfaces have proven their ability to efficiently convert the frequency of incident signals over subwavelength thickness. However, the availability of second-order nonlinear materials for such metasurfaces has so far been limited to III-V semiconductors, which have low transparency in the visible and impose constraints on the excitation geometries due to the lack of diagonal second-order susceptibility components. Here we propose a new design concept for second-order nonlinear metasurfaces on a monolithic substrate, which is not limited by the availability of thin crystalline films and can be applied to any non-centrosymmetric material. We exemplify this concept in a monolithic Lithium Niobate metasurface with cylinder-shaped corrugations for enhanced field confinement. By optimizing the geometrical parameters, we show enhanced second harmonic generation from a near-infrared pump beam with conversion efficiency above 10⁻⁵ using 1 GW/cm² pump intensity. Our approach enables new opportunities for practical designs of generic metasurfaces for nonlinear and quantum light sources.

Involved external institutions

How to cite

APA:

Carletti, L., Li, C., Sautter, J., Staude, I., De Angelis, C., Li, T., & Neshev, D.N. (2019). Second harmonic generation in monolithic lithium niobate metasurfaces. Optics Express, 27(23), 33391-33398. https://doi.org/10.1364/OE.27.033391

MLA:

Carletti, Luca, et al. "Second harmonic generation in monolithic lithium niobate metasurfaces." Optics Express 27.23 (2019): 33391-33398.

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