Van der Waals Layered Mineral Getchellite with Anisotropic Linear and Nonlinear Optical Responses
Van der Waals Layered Mineral Getchellite with Anisotropic Linear and Nonlinear Optical Responses
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DOI：
10.1002/lpor.202100182
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发表时间：
2021-10
影响因子：
11
通讯作者：
R. Tripathi;Xiaodong Yang;Jie Gao
中科院分区：
文献类型：
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作者：
R. Tripathi;Xiaodong Yang;Jie Gao
超薄三元二维材料最近在通过化学计量学变化来定制材料物理性质的背景下受到了极大的关注，这对光电子学、热电学和纳米光子学的许多应用至关重要。本文将硫化物矿物铁榴石确定为一种新型三元层状材料，并通过机械剥离法制备了大面积铁榴石薄片。本文报道了石墨烯薄片的高度各向异性线性和非线性光学响应，包括各向异性拉曼散射、波长相关的线性二色性转变和各向异性三次谐波产生（THG）。此外，从厚度相关的THG发射中反演了getchellite晶体的三阶非线性磁化率。范德华层状石墨烯的强各向异性线性和非线性光学特性将对光电探测器、光学传感器、非线性光信号处理器和其他片上光子器件原型的未来技术创新产生影响。
Ultrathin ternary 2D materials have recently gained significant attention in the context of tailoring physical properties of materials via stoichiometric variation, which are crucial to many applications in optoelectronics, thermoelectrics, and nanophotonics. Herein, sulfide mineral getchellite is identified as a new type of ternary layered material and large‐area getchellite thin flakes are prepared through mechanical exfoliation. The highly anisotropic linear and nonlinear optical responses of getchellite thin flakes facilitated by the reduced in‐plane crystal symmetry are reported, including anisotropic Raman scattering, wavelength‐dependent linear dichroism transition, and anisotropic third‐harmonic generation (THG). Furthermore, the third‐order nonlinear susceptibility for getchellite crystal is retrieved from the thickness‐dependent THG emission. The demonstrated strong anisotropic linear and nonlinear optical properties of van der Waals layered getchellite will have implications for future technological innovations in photodetectors, optical sensors, nonlinear optical signal processors, and other on‐chip photonic device prototypes.