Tuning the photo-response in monolayer MoS2 by plasmonic nano-antenna

被引：44
作者：
Li, Jiu [1 ]
Ji, Qingqing [3 ]
Chu, Saisai [1 ]
Zhang, Yanfeng [3 ]
Li, Yan [1 ,2 ]
Gong, Qihuang [1 ,2 ]
Liu, Kaihui [1 ]
Shi, Kebin [1 ,2 ]
机构：
[1] Peking Univ, Sch Phys, Collaborat Innovat Ctr Quantum Matter, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
[2] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China
[3] Peking Univ, Acad Adv Interdisciplinary Studies, Coll Chem & Mol Engn, Ctr Nanochem CNC,Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
基金：
美国国家科学基金会;
关键词：
VALLEY POLARIZATION; GENERATION; PHOTOLUMINESCENCE; TRANSITION; LIGHT; FILMS;
D O I：
10.1038/srep23626
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Monolayer molybdenum disulfide (MoS2) has recently attracted intense interests due to its remarkable optical properties of valley-selected optical response, strong nonlinear wave mixing and photocurrent/photovoltaic generation and many corresponding potential applications. However, the nature of atomic-thin thickness of monolayer MoS2 leads to inefficient light-matter interactions and thereby hinders its optoelectronic applications. Here we report on the enhanced and controllable photo-response in MoS2 by utilizing surface plasmonic resonance based on metallic nano-antenna with characteristic lateral size of 40 x 80 nm. Our nano-antenna is designed to have one plasmonic resonance in the visible range and can enhance the MoS2 photoluminescence intensity up to 10 folds. The intensity enhancement can be effectively tuned simply by the manipulation of incident light polarization. In addition, we can also control the oscillator strength ratio between exciton and trion states by controlling polarization dependent hot carrier doping in MoS2. Our results demonstrate the possibility in controlling the photo-response in broad two-dimensional materials by well-designed nano-antenna and facilitate its coming optoelectronic applications.
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页数：7
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