Gap-surface-plasmon induced polarization photoresponse for MoS_(2)-based photodetector  

作　　者：Qinghu Bai Xin Huang Yang Guo Shuo Du Chi Sun Leyong Hu Ruixuan Zheng Yang Yang Aizi Jin Junjie Li Changzhi Gu 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,CAS Key Laboratory of Vacuum Physics,University of Chinese Academy of Sciences,Beijing 100190,China [3]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Nano Research》2023年第7期10272-10278,共7页纳米研究（英文版）

基　　金：This work was supported by the National Key Research and Development Program of China(No.2021YFA1400700);the National Natural Science Foundation of China(Nos.61888102,62204259,62174179,92265110,11974386,12074420,U21A20140 and 61905274);the Beijing Municipal Science&Technology Commission,Administrative Commission of Zhongguancun Science Park(No.Z211100004821009);the Strategic Priority Research Program of Chinese Academy of Sciences(CAS)(Nos.XDB33000000 and XDB28000000);the Key Research Program of Frontier Sciences of CAS(Nos.QYZDJ-SSWSLH042 and XDPB22);the Project for Young Scientists in Basic Research of CAS(No.YSBR021);This work was also supported by the Synergic Extreme Condition User Facility,China.

摘　　要：Polarization-sensitive photodetectors based on two-dimensional(2D)materials have shown more attractive application prospects compared to traditional thin-film photodetectors due to their atomic thickness,tunable bandgap,high mobility and strong light-matter interactions.Among them,2D molybdenum disulfide(MoS_(2))has drawn numerous attentions in photodetection due to its wide spectral range,remarkable photoresponsivity and fast photo-switching rate.However,the isotropic crystal structure of MoS_(2)hampers its application in the polarization-sensitive detection,which is highly desired in military and civilian applications.In this paper,we demonstrated an integration of plasmonic nanocavity with monolayer MoS_(2)to achieve high photoresponsivity and polarization-sensitive photodetector.With the significant enhancement of electromagnetic field provided by the gap-surfaceplasmon(GSP),we achieved a significant photoluminescence(PL)enhancement of 24-fold.Relying on the enhanced light absorption by our plasmonic nanocavity,which generally facilitates photo-generation of electron-hole pairs in MoS_(2),we achieved a high photoresponsivity of 1.88 A/W and degree of linear polarization(DOLP)of 0.8 at the excitation wavelength of 633 nm.Our work provides a feasible and universal solution to realize polarization-sensitive photodetector of MoS_(2)for high-performance and polarization-sensitive photodetectors.

关 键 词：gap-surface-plasmon NANOCAVITY MoS_(2) PHOTODETECTOR linear polarization 

分 类 号：TN23[电子电信—物理电子学]