非局域响应在具有三角元原子的超表面上二次谐波产生中的作用

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Y. B. Habibullah, T. Ishihara
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引用次数: 0

摘要

实验和数值结果表明,由钝角等腰三角形元原子组成的方形阵列的超表面比裂环谐振器及其七方修饰的二次谐波产生效率高得多。它们都是在水平方向上缺乏反演对称性而具有垂直对称性,并且满足垂直极化基波和水平极化SHG波的双共振条件。通过计算二阶非线性偏振和场分布的重叠积分,对每个结构的SHG效率进行了数值估计。三角形超表面的大重叠积分归因于SHG波长处的非局部响应。SHG波长水平偏振光在钝角附近的三角形中心产生的电流流向锐角的两个角。结果,极化电荷在两个锐角的表面随时间振荡,这导致了远离中心的强场振荡,在中心,电场作用于大多数自由电子。实验观察到的三种超表面SHG效率的波长依赖性通过数值估计得到了合理的再现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The role of nonlocal response in second harmonic generation at metasurfaces with triangular metaatoms
Metasurface consisting of square array of obtuse isosceles triangle metaatoms is found to exhibit much more efficient second harmonic generation (SHG) compared to that of split ring resonators and its heptagonal modification, experimentally as well as numerically. All of them are designed to lack inversion symmetry in horizontal direction but to have vertical symmetry, and to meet the double resonance condition for vertically-polarized fundamental and horizontally-polarized SHG waves. SHG efficiencies were estimated numerically for each structure by evaluating an overlap integral of second order nonlinear polarization and field distribution at the SHG wavelength. The large overlap integral for the triangle metasurface is ascribed to the nonlocal response at the SHG wavelength. Current induced at the center of the triangle near the obtuse angle by horizontally polarized light at SHG wavelength flows toward two corners of acute angles. As a result, polarization charges oscillate in time at the surfaces of two acute corners, which results in strong field oscillation away from the center where the electric field is applied to majority of free electrons. Experimentally observed wavelength dependence of SHG efficiencies for the three metasurfaces are reasonably reproduced by a numerical estimation.
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来源期刊
EPJ Applied Metamaterials
EPJ Applied Metamaterials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.10
自引率
6.20%
发文量
16
审稿时长
8 weeks
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