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Multiple Scattering and Random Quasi-Phase-Matching in Disordered Assemblies of LiNbO3 Nanocubes
ACS Photonics ( IF 6.5 ) Pub Date : 2022-06-02 , DOI: 10.1021/acsphotonics.2c00210 Andrea Morandi 1 , Romolo Savo 1 , Jolanda Simone Müller 1 , Simeon Reichen 1 , Rachel Grange 1
ACS Photonics ( IF 6.5 ) Pub Date : 2022-06-02 , DOI: 10.1021/acsphotonics.2c00210 Andrea Morandi 1 , Romolo Savo 1 , Jolanda Simone Müller 1 , Simeon Reichen 1 , Rachel Grange 1
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Nonlinear disordered photonic media (NDPM), composed of a random configuration of noncentrosymmetric crystals, offer a versatile platform to tailor nonlinear optical effects. The second-harmonic generation (SHG) and its random quasi-phase-matching (RQPM) in the multiple scattering regime are still poorly explored. In this work, we bottom-up assemble NDPM in two different geometries by using LiNbO3 nanocubes as building blocks and investigate both the multiple scattering and the nonlinear properties. We produce disordered slabs with a continuously variable thickness and microspheres with different diameters, which display a remarkable strong light scattering, evidenced by a subwavelength transport mean free path (
). We first provide explicit evidence that the SHG power scales linearly with both the thickness of the slab and the volume of the microspheres. These observations generalize the characteristic linear scaling of RQPM power with the volume to the multiple scattering regime and to different sample geometries. Our structures represent a promising platform to investigate the interplay between disorder and optical nonlinear effects.
中文翻译：
LiNbO3 纳米立方体无序组装中的多重散射和随机准相位匹配
非线性无序光子介质 (NDPM) 由随机配置的非中心对称晶体组成，提供了一个多功能平台来定制非线性光学效应。二次谐波产生 (SHG) 及其在多重散射区域中的随机准相位匹配 (RQPM) 仍未得到很好的探索。在这项工作中，我们使用 LiNbO 3纳米立方体作为构建块，自下而上地将 NDPM 组装成两种不同的几何形状，并研究了多重散射和非线性特性。我们生产了具有连续可变厚度的无序板和具有不同直径的微球，它们显示出显着的强光散射，亚波长传输平均自由程证明了这一点（). 我们首先提供明确的证据表明 SHG 功率与板的厚度和微球体的体积呈线性关系。这些观察将 RQPM 功率随体积的特征线性缩放推广到多重散射机制和不同的样品几何形状。我们的结构代表了一个有前途的平台来研究无序和光学非线性效应之间的相互作用。
更新日期：2022-06-02
). We first provide explicit evidence that the SHG power scales linearly with both the thickness of the slab and the volume of the microspheres. These observations generalize the characteristic linear scaling of RQPM power with the volume to the multiple scattering regime and to different sample geometries. Our structures represent a promising platform to investigate the interplay between disorder and optical nonlinear effects.
中文翻译：
LiNbO3 纳米立方体无序组装中的多重散射和随机准相位匹配
非线性无序光子介质 (NDPM) 由随机配置的非中心对称晶体组成，提供了一个多功能平台来定制非线性光学效应。二次谐波产生 (SHG) 及其在多重散射区域中的随机准相位匹配 (RQPM) 仍未得到很好的探索。在这项工作中，我们使用 LiNbO 3纳米立方体作为构建块，自下而上地将 NDPM 组装成两种不同的几何形状，并研究了多重散射和非线性特性。我们生产了具有连续可变厚度的无序板和具有不同直径的微球，它们显示出显着的强光散射，亚波长传输平均自由程证明了这一点（
). 我们首先提供明确的证据表明 SHG 功率与板的厚度和微球体的体积呈线性关系。这些观察将 RQPM 功率随体积的特征线性缩放推广到多重散射机制和不同的样品几何形状。我们的结构代表了一个有前途的平台来研究无序和光学非线性效应之间的相互作用。
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