Anisotropic Third‐Harmonic Generation in Layered Germanium Selenide,Laser & Photonics Reviews

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Anisotropic Third‐Harmonic Generation in Layered Germanium Selenide
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-05-20 , DOI: 10.1002/lpor.201900416
Arindam Dasgupta ₁ , Jie Gao ₁ , Xiaodong Yang ₁

Affiliation

Germanium selenide (GeSe) is a 2D layered material with an anisotropic crystal structure analogous to black phosphorus (BP). But unlike BP, GeSe is stable under ambient conditions and therefore provides more flexibility in building practical nanoscale devices. The in‐plane anisotropic vibrational, electrical, and optical properties of layered GeSe originating from the low symmetry of its crystal structure are being explored mostly for building polarization‐sensitive optoelectronic devices. However, the nonlinear optical properties of layered GeSe have not been investigated yet. Here, the anisotropic polarization‐dependent third‐harmonic generation (THG) from exfoliated thin GeSe flakes due to the low in‐plane lattice symmetry is reported. Furthermore, it is also shown that the intensity and polarization state of TH emission can be controlled by the polarization state of pump beam. Moreover, it is demonstrated that the crystal's symmetry axes can be rapidly determined by characterizing the intensity profile of TH emission upon the excitation from radially or azimuthally polarized vector beam. The results of this study pave the way for realizing anisotropic nonlinear optical devices such as multiplexers, signal processors, and other prototypes for future on‐chip photonic circuits and optical information processing.

中文翻译：

硒化锗层中的各向异性三次谐波产生

硒化锗（GeSe）是一种二维层状材料，具有类似于黑磷（BP）的各向异性晶体结构。但是与BP不同，GeSe在环境条件下稳定，因此在构建实用的纳米级设备时提供了更大的灵活性。层状GeSe的面内各向异性振动，电学和光学性质源自其晶体结构的低对称性，主要用于构建偏振敏感型光电器件。但是，尚未研究层状GeSe的非线性光学性质。在这里，由于平面内晶格对称性低，从剥落的薄GeSe薄片中产生了各向异性极化相关的三次谐波（THG）。此外，还表明TH发射的强度和偏振态可以通过泵浦光束的偏振态来控制。此外，证明了通过表征从径向或方位极化的矢量束激发时TH发射的强度分布，可以快速确定晶体的对称轴。这项研究的结果为实现各向异性非线性光学设备（例如多路复用器，信号处理器和其他原型，为将来的片上光子电路和光学信息处理）铺平了道路。

更新日期：2020-05-20

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