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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.
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Keywords:
- MoS2 /
- photoluminescence /
- plasmonic resonator /
- Purcell effect
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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.
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.
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°.
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) Φex(co) = 0°; (b) Φex(co) = 90°
Fig. 4. The photon counts of APD at different angle combinations of the excitation and detection lights: (a) Φex(co) = 0°; (b) Φex(co) = 90°.
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.
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[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
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Google Scholar
[4] 董海明 2013 62 206101
Google Scholar
Dong H M 2013 Acta Phys. Sin. 62 206101
Google Scholar
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Google Scholar
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Google Scholar
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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
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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
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Google Scholar
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Google Scholar
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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
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Google Scholar
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Google Scholar
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Google Scholar
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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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