Two-Dimensional
Pyramid-like WS<sub>2</sub> Layered
Structures for Highly Efficient Edge Second-Harmonic Generation
Xianqing Lin
Yingying Liu
Kang Wang
Cong Wei
Wei Zhang
Yongli Yan
Yong Jun Li
Jiannian Yao
Yong Sheng Zhao
10.1021/acsnano.7b07823.s001
https://acs.figshare.com/articles/journal_contribution/Two-Dimensional_Pyramid-like_WS_sub_2_sub_Layered_Structures_for_Highly_Efficient_Edge_Second-Harmonic_Generation/5760810
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 WS<sub>2</sub> 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.
2018-01-02 00:00:00
P-multilayer 2 D
nonlinear conversion efficiency
WGM mode
edge second-harmonic generation
basal planes
edge SHG
nonlinear polarizations
edge SH radiation
2 D pyramid-like
nonlinear susceptibility
whispering-gallery mode
P-multilayer WS 2 forms
material
WGM resonance cavity
nonlinear processes
Two-Dimensional Pyramid-like WS 2 Layered Structures
2 D
interaction
field confinement
2 D plate-like triangle morphology