Second harmonic generation in monolithic lithium niobate metasurfaces

Anno: 2019

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

Affiliazione autori: 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

Giornale/Rivista: OPTICS EXPRESS

Volume: 27 (23)      Da Pagina: 33390  A: 33397

Maggiori informazioni: Australian Research Council (DP190101559); Foundation for Innovative Research Groups of the National Natural Science Foundation of China (11674167, 91850204); Deutsche Forschungsgemeinschaft (STA 1426/2-1); National Key Research and Development Program of China Stem Cell and Translational Research (2017YFA0303701); Universita degli Studi di Padova (STARS-StG-PULSAr).
Parole chiavi: DIFFRACTION
DOI: 10.1364/OE.27.033391

Citazioni: 52
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-11
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