Scientific Results

Second harmonic generation in monolithic lithium niobate metasurfaces

Year: 2019

Authors: Carletti L., Li C., Sautter J., Staude I., De Angelis C., Li T., Neshev DN.

Autors Affiliation: Australian Natl Univ, Nonlinear Phys Ctr, Res Sch Phys, Canberra, ACT 2601, Australia; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; CNR, INO, Via Branze 38, I-25123 Brescia, Italy; Univ Padua, Dept Informat Engn, Via Gradenigo 6-A, I-35131 Padua, Italy; Nanjing Univ, Coll Engn & Appl Sci, Nanjing 210093, Jiangsu, Peoples R China; Friedrich Schiller Univ Jena, Abbe Ctr Photon, Inst Appl Phys, D-07745 Jena, Germany

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/cm(2) pump intensity. Our approach enables new opportunities for practical designs of generic metasurfaces for nonlinear and quantum light sources. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 27 (23)      Pages from: 33390  to: 33397

KeyWords: DIFFRACTION
DOI: 10.1364/OE.27.033391

Citations: 1
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