等离子体谐振腔对二硫化钼的荧光增强效应

孟凡; 胡劲华; 王辉; 邹戈胤; 崔建功; 赵乐

doi:10.7498/aps.68.20191121

摘要

二硫化钼(MoS₂)作为一种层状过渡金属硫族化合物, 是未来光子学与光电子学领域的重要组成材料. 本文设计实现了MoS₂与谐振腔耦合系统, 将蝴蝶结型等离子体谐振腔的谐振模式与单层MoS₂光致发光(PL)谱相耦合, 得到该条件下最佳PL强度增强效果. 通过理论模型与实验数据的分析, 利用珀塞尔效应对自发辐射速率进行控制, 得到了峰值为9.5倍、带宽为100 nm的宽带增强谱. 同时, 增强的PL强度随激发光和探测光的偏振角度满足余弦函数规律的依赖特性, 证明了谐振模式来自谐振腔中的电场偶极子. 该研究提供了在单层MoS₂与等离子体谐振腔耦合结构中研究光与物质相互作用增强的可行性, 为今后基于MoS₂光子学器件的发射与探测效率提升开辟出一条新途径.

关键词:

Abstract

Molybdenum disulfide (MoS₂), as a layered transition metal chalcogenide, plays an important role in fields of photonics and photoelectronics. Here, a coupled system consisting of monlayer MoS₂ and nano-resonator is designed and implemented. The photoluminescence (PL) spectrum of the MoS₂ is coupled with the resonant mode of plasmonic bowtie resonator, thus achieving an optimal PL enhancement condition. Based on the analysis of theoretical model and experimental data, the spontaneous emission rate can be controlled by the Purcell effect, and the broadband enhanced spectrum is obtained in which its peak value increases 9.5 times and bandwidth is 100 nm . Meanwhile, the enhanced PL intensity also satisfies the cosine function relation between the polarization angle of the exciting light and that of the detecting light, which proves that the resonance mode comes from the electric field dipole in the resonator. This study provides the feasibility of studying the enhancement of light-matter interaction in an MoS₂-plasmonic resonator coupled structure, which opens up a new route to improving the emission and detection efficiency of MoS₂-based photonic devices in future.

Keywords:

作者及机构信息

1.
石家庄铁道大学信息科学与技术学院, 石家庄　050043

2.
河北工程大学信息与电气工程学院, 邯郸　056038

3.
石家庄邮电职业技术学院培训部, 石家庄　050021

4.
中北大学电子测试技术国家重点实验室, 太原　030051

5.
河北医科大学第四医院消化内科, 石家庄　050011

通信作者: 孟凡, mengfan3426@126.com ; 赵乐, daisyvivi111@sina.com

基金项目: 河北省优秀青年科学基金(批准号: F2018210100)、河北高等学校青年拔尖人才项目(批准号: BJ2018003)、河北省自然科学基金(批准号: F2017402068)和山西省自然科学基金(批准号: 201801D221198)资助的课题

Authors and contacts

1.
School of Information Science and Technology, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

2.
School of Information and Electrical Engineering, Hebei University of Engineering, Handan 056038, China

3.
Training Department, Shijiazhuang Post and Telecommunication Technical College, Shijiazhuang 050021, China

4.
State Key Laboratory of Dynamics Testing Technology, North University of China, Taiyuan 030051, China

5.
Department of Gastroenterology and Hepatology, The Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China

Corresponding author: Meng Fan, mengfan3426@126.com ; Zhao Yue, daisyvivi111@sina.com

Funds: Project supported by the Science Foundation for the Excellent Youth Scholars of Hebei Province, China (Grant No. F2018210100), the Top Young Talents in Hebei Colleges and Universities, China (Grant No. BJ2018003), the Natural Science Foundation of Hebei Province, China (Grant No. F2017402068), and the Natural Science Foundation of Shanxi Province, China (Grant No. 201801D221198)

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参考文献

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施引文献

图 1 MoS₂与谐振腔耦合系统(样品)的(a)结构示意图, (b)扫描电子显微镜(SEM)图像和(c)光学图像

Fig. 1. The MoS₂-cavity coupled system’s (a) structural diagram, (b) scanning electron microscope image, and (c) optical image.

下载: 全尺寸图片幻灯片

图 2 (a)研究单层MoS₂ PL增强效应的共焦显微系统装置图; (b) EMCCD得到的样品远场PL强度扫描图

Fig. 2. (a) The con-focal microscope setup of measuring PL enhancement of monolayer MoS₂; (b) the sample's far-field PL intensity image of EMCCD.

下载: 全尺寸图片幻灯片

图 3 MoS₂辐射光偏振与谐振腔长轴方向在不同夹角　(a) Φ = 0° 和(b) Φ = 90°下得到的PL增强扫描图

Fig. 3. The APD scanning images of MoS₂ PL enhancement when the angles between the excitation light and resonator’s long-axis are (a) Φ = 0° and (b) Φ = 90°.

下载: 全尺寸图片幻灯片

图 4 不同激发光(探测光)偏振角度下, 探测光(激发光)的光子数变化规律曲线　(a) Φ_ex(co) = 0°; (b) Φ_ex(co) = 90°

Fig. 4. The photon counts of APD at different angle combinations of the excitation and detection lights: (a) Φ_ex(co) = 0°; (b) Φ_ex(co) = 90°.

下载: 全尺寸图片幻灯片

图 5 (a)单层MoS₂在不同情形下的PL谱线; (b)等离子体谐振腔的传输谱; (c)实验中得到的最大PL增强倍数曲线

Fig. 5. (a) The PL spectra of monolayer MoS₂ in different cases; (b) the transmission spectrum of the plasmonic resonator; (c) the PL enhancement of the MoS2-cavity coupled system.

下载: 全尺寸图片幻灯片

[1]	Wang C C, Liu X S, Wang Z Y, Zhao M, He H, Zou J Y 2018 Chin. Phys. B 27 118106 Google Scholar
[2]	Wang Q H, Kalantar-Zadeh K, Kis A, Coleman J N, Strano M S 2012 Nature Nanotech. 7 699 Google Scholar
[3]	Li X, He D W, Wang Y S, Hu Y, Zhao X, Fu C, Wu J Y 2018 Chin. Phys. B 27 056104 Google Scholar
[4]	董海明 2013 物理学报 62 206101 Google Scholar Dong H M 2013 Acta Phys. Sin. 62 206101 Google Scholar
[5]	Huang X, Zeng Z, Zhang H 2013 Chem. Soc. Rev. 42 1934 Google Scholar
[6]	Chhowalla M, Shin H S, Eda G, Li L J, Loh K P, Zhang H 2013 Nature Chem. 5 263 Google Scholar
[7]	顾品超, 张楷亮, 冯玉林, 王芳, 苗银萍, 韩叶梅, 张韩霞 2016 物理学报 65 018102 Google Scholar Gu P C, Zhang K L, Feng Y L, Wang F, Miao Y P, Han Y M, Zhang H X 2016 Acta Phys. Sin. 65 018102 Google Scholar
[8]	魏晓旭, 程英, 霍达, 张宇涵, 王军转, 胡勇, 施毅 2014 物理学报 63 217802 Google Scholar Wei X X, Cheng Y, Huo D, Zhang Y H, Wang J Z, Hu Y, Chi Y 2014 Acta Phys. Sin. 63 217802 Google Scholar
[9]	Mak K F, Lee C, Hone J, Shan J, Heinz T F 2010 Phys. Rev. Lett. 105 136805 Google Scholar
[10]	Splendiani A, Sun L, Zhang Y, Li T, Kim J, Chim C Y, Galli G, Wang F 2010 Nano Lett. 10 1271 Google Scholar
[11]	Lopez-Sanchez O, Lembke D, Kayci M, Radenovic A, Kis A 2013 Nature Nanotech. 8 497 Google Scholar
[12]	Sundaram R S, Engel M, Lombardo A, Krupke R, Ferrari A C, Avouris P, Steiner M 2013 Nano Lett. 13 1416 Google Scholar
[13]	Wang K P, Wang J, Fan J T, Lotya M, O’Neill A, Fox D, Feng Y Y, Zhang X Y, Jiang B X, Zhao Q Z, Zhang H Z, Coleman J N, Zhang L, Blau W J 2013 ACS Nano 7 9260 Google Scholar
[14]	Emmanuel F, Samuel G 2008 J. Phys. D: Appl. Phys. 41 013001 Google Scholar
[15]	Gan X T, Gao Y D, Mak K F, Yao X W, Shiue R J, Zande A, Trusheim M, Hatami F, Heinz T, Hone J, Englund D 2013 Appl. Phys. Lett. 103 181119 Google Scholar
[16]	Wu S F, Buckley S, Jones A M, Ross J S, Ghimire N J, Yan J Q, Mandrus D G, Yao W, Hatami F, Vuckovic J, Majumdar A, Xu X D 2014 2D Mater. 1 011001
[17]	Kinkhabwala A, Yu Z F, Fan S H, Avlasevich Y, Mullen K, Moerner W E 2009 Nature Photon. 3 654 Google Scholar
[18]	Guo R, Kinzel E C, Li Y, Uppuluri S M, Raman A, Xu X F 2010 Opt. Express 18 4961 Google Scholar
[19]	Tongay S, Fan W, Kang J, Park J, Koldemir U, Suh J, Narang D S, Liu K, Ji J, Li J B, Sinclair R, Wu J Q 2014 Nano Lett. 14 3185 Google Scholar
[20]	Lu G W, Li W Q, Zhang T Y, Yue S, Liu J, Hou L, Li Z, Gong Q H 2012 ACS Nano 6 1438 Google Scholar

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