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Polarization-Dependent Second Harmonic Diffraction from Resonant GaAs Metasurfaces
ACS Photonics ( IF 7 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1021/acsphotonics.7b01533
Franz J. F. Löchner 1 , Anna N. Fedotova 1, 2 , Sheng Liu 3 , Gordon A. Keeler 3 , Gregory M. Peake 3 , Sina Saravi 1 , Maxim R. Shcherbakov 2, 4 , Sven Burger 5, 6 , Andrey A. Fedyanin 2 , Igal Brener 3 , Thomas Pertsch 1 , Frank Setzpfandt 1 , Isabelle Staude 1
Affiliation  

Resonant semiconductor metasurfaces are an emerging versatile platform for nonlinear photonics. In this work, we investigate second-harmonic generation from metasurfaces consisting of two-dimensional square arrays of gallium arsenide nanocylinders as a function of the polarization of the fundamental wave. To this end, we perform nonlinear second harmonic microscopy, where the pump wavelength is tuned to the resonances of the metasurfaces. Furthermore, imaging the generated nonlinear signal in Fourier space allows us to analyze the spatial properties of the generated second harmonic. Our experiments reveal that the second harmonic is predominantly emitted into the first diffraction orders of the periodic arrangements, and that its intensity varies with the polarization angle of the fundamental wave. While this can be expected from the structure of the GaAs nonlinear tensor, the characteristics of this variation itself are found to depend on the pump wavelength. Interestingly, we show that the metasurface can reverse the polarization dependence of the second harmonic with respect to an unstructured GaAs wafer. These general observations are confirmed by numerical simulations using a simplified model for the metasurface. Our results provide valuable input for the development of metasurface-based classical and quantum light sources based on parametric processes.

中文翻译:

来自共振GaAs超表面的极化相关的第二谐波衍射

谐振半导体超表面是用于非线性光子学的新兴通用平台。在这项工作中,我们研究了由砷化镓纳米圆柱体的二维方阵组成的超颖表面产生的第二谐波,它是基波极化的函数。为此,我们进行了非线性二次谐波显微镜,其中泵浦波长被调整到超表面的共振。此外,在傅立叶空间中对生成的非线性信号进行成像,使我们能够分析生成的二次谐波的空间特性。我们的实验表明,二次谐波主要发射到周期性排列的第一衍射级中,并且其强度随基波的偏振角而变化。尽管可以从GaAs非线性张量的结构中预料到这一点,但发现这种变化本身的特性取决于泵浦波长。有趣的是,我们表明,超颖表面可以逆转相对于非结构化GaAs晶片的二次谐波的偏振依赖性。这些一般的观察结果通过使用简化的超颖表面模型进行数值模拟得到了证实。我们的结果为基于参数化过程的基于超表面的经典光源和量子光源的开发提供了有价值的输入。这些一般的观察结果通过使用简化的超颖表面模型进行数值模拟得到了证实。我们的结果为基于参数化过程的基于超表面的经典光源和量子光源的开发提供了有价值的输入。这些一般的观察结果通过使用简化的超颖表面模型进行数值模拟得到了证实。我们的结果为基于参数化过程的基于超表面的经典光源和量子光源的开发提供了有价值的输入。
更新日期:2018-03-14
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