Interfacial Charge Transfer for Enhancing Nonlinear Saturable Absorption in WS2/graphene Heterostructure

Yiduo Wang; Yingwei Wang; Changyong Lan; Li Zhou; Jianlong Kang; Wanxin Zheng; Tianyu Xue; Yejun Li; Xiaoming Yuan; Si Xiao; Heping Li; Jun He

doi:10.1002/advs.202306096

Interfacial Charge Transfer for Enhancing Nonlinear Saturable Absorption in WS₂/graphene Heterostructure

Adv Sci (Weinh). 2024 Mar;11(12):e2306096. doi: 10.1002/advs.202306096. Epub 2024 Jan 15.

Authors

Yiduo Wang^{1

2}, Yingwei Wang^{1

2}, Changyong Lan³, Li Zhou^{1

2}, Jianlong Kang^{1

2}, Wanxin Zheng^{1

2}, Tianyu Xue⁴, Yejun Li^{1

2}, Xiaoming Yuan^{1

2}, Si Xiao^{1

2}, Heping Li³, Jun He^{1

2}

Affiliations

¹ Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, China.
² Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, 410083, China.
³ State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China.
⁴ Center for High-Pressure Science, State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China.

Abstract

Interlayer charge-transfer (CT) in 2D atomically thin vertical stacks heterostructures offers an unparalleled new approach to regulation of device performance in optoelectronic and photonics applications. Despite the fact that the saturable absorption (SA) in 2D heterostructures involves highly efficient optical modulation in the space and time domain, the lack of explicit SA regulation mechanism at the nanoscale prevents this feature from realizing nanophotonic modulation. Here, the enhancement of SA response via CT in WS₂/graphene vertical heterostructure is proposed and the related mechanism is demonstrated through simulations and experiments. Leveraging this mechanism, CT-induced SA enhancement can be expanded to a wide range of nonlinear optical modulation applications for 2D materials. The results suggest that CT between 2D heterostructures enables efficient nonlinear optical response regulation.

Keywords: 2D materials heterostructures; Interfacial charge transfers; enhancement of saturable absorptions; nonlinear optical responses.

Abstract

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