Two-Dimensional Pyramid-like WS2 Layered Structures for Highly Efficient Edge Second-Harmonic Generation,ACS Nano

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Two-Dimensional Pyramid-like WS2 Layered Structures for Highly Efficient Edge Second-Harmonic Generation
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acsnano.7b07823
Xianqing Lin _{1,

2} , Yingying Liu _{1,

2} , Kang Wang _{1,

2} , Cong Wei _{1,

2} , Wei Zhang _{1,

2} , Yongli Yan _{1,

2} , Yong Jun Li _{1,

2} , Jiannian Yao _{1,

2} , Yong Sheng Zhao _{1,

2}

Affiliation

Two-dimensional (2D) layered materials, with large second-order nonlinear susceptibility, have received much scientific interest due to their potential applications in nonlinear optical devices. However, the atomic thickness of 2D layered materials leads to poor field confinement and weak light–matter interaction at the nanoscale, resulting in low nonlinear conversion efficiency. Here, 2D pyramid-like multilayer (P-multilayer) layered structures are fabricated for efficient edge second-harmonic generation (SHG) based on the enhanced light–matter interaction in whispering-gallery mode (WGM) cavities. The P-multilayer 2D layered materials, where the basal planes shrink gradually from the bottom to the top layers, exhibit efficient edge SH radiation due to the partial destructive interference of nonlinear polarizations between the neighboring atomic layers. Moreover, the well-defined 2D plate-like triangle morphology of P-multilayer WS₂ forms a WGM resonance cavity, which results in enhanced light–matter interaction and thus the enhancement of edge SHG, which can be further enhanced by hybridizing the WGM mode with plasmonics. These results provide enlightenment for the construction of specific structures for efficient nonlinear processes.

中文翻译：

高效棱边二次谐波生成的二维金字塔状WS ₂分层结构

具有较大二阶非线性磁化率的二维（2D）层状材料由于其在非线性光学设备中的潜在应用而受到了广泛的科学兴趣。但是，二维层状材料的原子厚度会导致不良的电场限制以及纳米级的弱光-物质相互作用，从而导致较低的非线性转换效率。在此，基于耳语画廊模式（WGM）腔中增强的光-质相互作用，制造了2D金字塔状多层（P-多层）分层结构，以进行有效的边缘二次谐波生成（SHG）。P多层2D层材料，其基面从底层到顶层逐渐收缩，由于相邻原子层之间的非线性极化的部分破坏性干涉，其具有有效的边缘SH辐射。此外，P多层WS的明确2D板状三角形形态₂形成一个WGM谐振腔，它导致光-物质相互作用增强，从而使边缘SHG增强，这可以通过将WGM模式与等离激元混合而进一步增强。这些结果为有效的非线性过程中特定结构的构建提供了启示。

更新日期：2018-01-05

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