等离子体谐振腔对二硫化钼的荧光增强效应  

Fluorescence enhancement of monolayer MoS2 in plasmonic resonator

作　　者：孟凡 胡劲华[2] 王辉 邹戈胤 崔建功 赵乐 Meng Fan;Hu Jin-Hua;Wang Hui;Zou Ge-Yin;Cui Jian-Gong;Zhao Yue(School of Information Science and Technology,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Information and Electrical Engineering,Hebei University of Engineering,Handan 056038,China;Training Department,Shijiazhuang Post and Telecommunication Technical College,Shijiazhuang 050021,China;State Key Laboratory of Dynamics Testing Technology,North University of China,Taiyuan 030051,China;Department of Gastroenterology and Hepatology,The Fourth Hospital of Hebei Medical University,Shijiazhuang 050011,China)

机构地区：[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

出　　处：《物理学报》2019年第23期272-278,共7页Acta Physica Sinica

基　　金：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);山西省自然科学基金(批准号:201801D221198)资助的课题~~

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.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.

关 键 词：二硫化钼 光致发光 等离子体谐振腔 珀塞尔效应 

分 类 号：TN2[电子电信—物理电子学]