范德华力 CuInP2S6 中应变纳米结构的非凡非线性光学相互作用,ACS Nano

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范德华力 CuInP2S6 中应变纳米结构的非凡非线性光学相互作用
ACS Nano ( IF 15.8 ) Pub Date : 2022-08-18 , DOI: 10.1021/acsnano.2c03294
Sharidya Rahman ₁ , Tanju Yildirim ₂ , Mike Tebyetekerwa ₃ , Ahmed Raza Khan ₁ , Yuerui Lu _{1,

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Affiliation

二维材料的局部应变工程和结构修改提供了对其光电特性的仁慈控制，并提供了一种令人兴奋的方法来调节层状材料中的光-物质相互作用。在纳米尺度上施加应变通常是通过永久变形的纳米结构（例如纳米皱纹）获得的，这会产生大的带隙调制、光致发光增强和表面电位。超薄过渡金属二硫属化物 (TMD) 已为此目的进行了大量分析。在此，我们将应变诱导纳米工程扩展到新兴的二维材料 CuInP ₂ S ₆（CIPS），并可视化对非线性光物质相互作用的非凡控制。与未应变区域相比，皱纹纳米结构在二次谐波产生（SHG）方面表现出约 160 倍的增强，这还受到电介质环境变化的影响。SHG 增强受施加应变的百分比显着调节，这是数值估计的。此外，由于压缩矢量的方向，偏振相关的 SHG 分别显示了平行和垂直方向的淬火和增强。我们的工作在控制超越 TMD 的光电特性方面提供了重要的进步，用于即将在柔性电子产品中的应用。

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Extraordinary Nonlinear Optical Interaction from Strained Nanostructures in van der Waals CuInP2S6

Local strain engineering and structural modification of 2D materials furnish benevolent control over their optoelectronic properties and provide an exciting approach to tune light–matter interaction in layered materials. Application of strain at the nanoscale is typically obtained through permanently deformed nanostructures such as nanowrinkles, which yield large band gap modulation, photoluminescence enhancement, and surface potential. Ultrathin transition metal dichalcogenides (TMDs) have been greatly analyzed for such purposes. Herein, we extend strain-induced nanoengineering to an emerging 2D material, CuInP₂S₆ (CIPS), and visualize extraordinary control over nonlinear light–matter interaction. Wrinkle nanostructures exhibit ∼160-fold enhancement in second harmonic generation (SHG) compared to unstrained regions, which is additionally influenced by a change in the dielectric environment. The SHG enhancement was significantly modulated by the percentage of applied strain which was numerically estimated. Furthermore, polarization-dependent SHG revealed quenching and enhancement in the parallel and perpendicular directions, respectively, due to the direction of the compressive vector. Our work provides an important advancement in controlling optoelectronic properties beyond TMDs for imminent applications in flexible electronics.

更新日期：2022-08-18

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