纳米研究（英文版）

2020

Nano Research   影响因子和分区

1998-0124

Strong geometrical confinement and reduced dielectric screening of two-dimensional(2D)materials leads to strong Coulomb interaction and eventually give rise to extraordinary excitonic effects,which dominates the optical and optoelectronic properties.For nonlinear 2D photonic or optoelectronic applications,excitonic effects have been proved effective to tune the light-matter interaction strength.However,the modulation of excitonic effects on the other aspect of nonlinear response,i.e.,polarization dependence,has not been fully explored yet.Here we report the first systemic study on the modulation of excitonic effects on the polarization dependence of second and third harmonic generation(SHG and THG)in strained monolayer WS2 by varying excitation wavelength.We demonstrated that polarization-dependent THG patterns undergo a giant evolution near two-photon excitonic resonance,where the long-axis of the parallel component(originally parallel to the strain direction)has a 90° flip when the excitation wavelength increases.In striking contrast,no apparent variation of polarization-dependent SHG patterns occurs at either two-or three-photon excitonic resonance conditions.Our results open a new avenue to modulate the anisotropic nonlinear optical response of 2D materials through effective control of excitonic resonance states,and thus open opportunity for new designs and applications in nonlinear optoelectronic 2D devices.

two-dimensional materials nonlinear optics excitonic effects

英语

其他

(This work was supported by the Key R&D Program of Guangdong Province)%(the National Natural Science Foundation of China)%(the National Key R&D Program of China)%(Beijing Natural Science Foundation)%(Beijing Excellent Talents Training Support)%(Beijing Municipal Science&Technology Commission)%(Beijing Graphene Innovation Program)%(Bureau of Industry and Information Technology of Shenzhen)%(Guangdong Innovative and Entrepreneurial Research Team Program)%(and the Science,Technology and Innovation Commission of Shenzhen Municipality)

PHYSICS

WanFang

perioarticalnmyj-z202012009

1.State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China;Academy for Advanced Interdisciplinary Studies,Collaborative Innovation Center of Quantum Matter,Peking University,Beijing 100871,China
2.School of Chemistry and Chemical Engineering Beijing Institute of Technology,Beijing100081,China
3.State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China
4.International Center for Quantum Materials,Electron Microscopy Laboratory,School of Physics,Peking University,Beijing 100871,China
5.Shenzhen Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China
6.北京工业大学
7.南方科技大学

. 纳米研究（英文版）[J]. Nano Research,2020,13(12):3235-3240.

(2020).纳米研究（英文版）.Nano Research,13(12),3235-3240.

"纳米研究（英文版）".Nano Research 13.12(2020):3235-3240.