Fedotova Anna, Younesi Mohammadreza, Sautter Jürgen, Vaskin Aleksandr, Löchner Franz J F, Steinert Michael, Geiss Reinhard, Pertsch Thomas, Staude Isabelle, Setzpfandt Frank
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany.
Fraunhofer Institute of Applied Optics and Precision Engineering, 07745 Jena, Germany.
Nano Lett. 2020 Dec 9;20(12):8608-8614. doi: 10.1021/acs.nanolett.0c03290. Epub 2020 Nov 12.
Lithium niobate is an excellent and widely used material for nonlinear frequency conversion due to its strong optical nonlinearity and broad transparency region. Here, we report the fabrication and experimental investigation of resonant nonlinear metasurfaces for second-harmonic generation based on thin-film lithium niobate. In the fabricated metasurfaces, we observe pronounced Mie-type resonances leading to enhanced second-harmonic generation in the direction normal to the metasurface. We find the largest second-harmonic generation efficiency for the resonance dominated by the electric contributions because its specific field distribution enables the most efficient usage of the largest element of the lithium niobate nonlinear susceptibility tensor. This is confirmed by polarization-resolved second-harmonic measurements, where we study contributions from different elements of the nonlinear susceptibility tensor to the total second-harmonic signal. Our work facilitates establishing lithium niobate as a material for resonant nanophotonics.
铌酸锂因其强烈的光学非线性和宽广的透明区域，是一种优异且广泛应用于非线性频率转换的材料。在此，我们报告了基于薄膜铌酸锂的用于二次谐波产生的共振非线性超表面的制备及实验研究。在所制备的超表面中，我们观察到显著的米氏型共振，从而在垂直于超表面的方向上增强了二次谐波产生。我们发现，由电贡献主导的共振具有最大的二次谐波产生效率，因为其特定的场分布能够最有效地利用铌酸锂非线性极化率张量的最大元素。极化分辨二次谐波测量证实了这一点，在该测量中我们研究了非线性极化率张量的不同元素对总二次谐波信号的贡献。我们的工作有助于确立铌酸锂作为一种用于共振纳米光子学的材料。
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