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Ultrafast Response of a Hybrid Device Based on Strongly Coupled Monolayer WS2 and Photonic Crystals: The Effect of Photoinduced Coulombic Screening
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-03-05 , DOI: 10.1002/lpor.201900419 Yuxiang Tang 1 , Yanbin Zhang 2 , Hao Ouyang 1 , Maoxiong Zhao 2 , Hao Hao 3 , Ke Wei 1 , Han Li 1 , Yizhen Sui 1 , Jie You 4 , Xin Zheng 4 , Zhongjie Xu 1 , Xiangai Cheng 1 , Lei Shi 2 , Tian Jiang 1
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-03-05 , DOI: 10.1002/lpor.201900419 Yuxiang Tang 1 , Yanbin Zhang 2 , Hao Ouyang 1 , Maoxiong Zhao 2 , Hao Hao 3 , Ke Wei 1 , Han Li 1 , Yizhen Sui 1 , Jie You 4 , Xin Zheng 4 , Zhongjie Xu 1 , Xiangai Cheng 1 , Lei Shi 2 , Tian Jiang 1
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Quantum interactions between transition metal dichalcogenides (TMDs) and optical cavities are rapidly becoming an appealing research topic since these interactions underly a broad spectrum of optical phenomena. Here, we fabricate a simple device in which coherent strong coupling interactions occur between a photonic crystal (PhC) slab and monolayer tungsten disulfide (WS2). Both steady‐state angle‐resolved spectroscopy and transient absorption microscopy (TAM) are employed to explore the coupling behavior of this device. Specifically, anticrossing dispersions are observed in the hybrid device, indicating a Rabi splitting of 40.2 meV. A newly formed spectral feature emerges in the transient absorption (TA) spectrum of this polariton device under near‐resonant excitation, which is subsequently evidenced to be a signature of the upper hybrid exciton–polariton state. Moreover, by carefully analyzing the ultrafast responses of both bare WS2 and the WS2‐PhC polariton device excited both off resonance and near resonance, it is found that nonequilibrium thermal decay induces Coulombic screening in the monolayer WS2, which has a major impact on the formation of exciton–polariton. The results of this work could not only improve the current understanding of photophysics in the strong light–matter coupling regime but also lay the foundation for tailoring the development of TMD‐based coherent devices.
中文翻译：
基于强耦合单层WS2和光子晶体的混合器件的超快响应：光诱导库仑筛选的影响
过渡金属二卤化物（TMD）与光学腔之间的量子相互作用正迅速成为一个吸引人的研究课题，因为这些相互作用是广谱的光学现象的基础。在这里，我们制造了一个简单的装置，其中光子晶体（PhC）平板和单层二硫化钨（WS 2）。稳态角分辨光谱法和瞬态吸收显微镜（TAM）均用于研究该器件的耦合特性。具体而言，在混合装置中观察到抗交叉分散，表明Rabi分裂为40.2meV。在近共振激发下，这种极化子器件的瞬态吸收（TA）谱中出现了新形成的光谱特征，随后证明是上层混合激子-极化子态的标志。此外，通过仔细分析裸WS 2和WS 2 -PhC极化装置在非共振和近共振状态下激发的超快响应，发现非平衡热衰减在单层WS 2中引起库仑筛选。，这对激子-极化子的形成有重要影响。这项工作的结果不仅可以增强当前对强光-质耦合机制中光物理的理解，而且可以为定制基于TMD的相干设备的开发奠定基础。
更新日期：2020-03-05
中文翻译：
基于强耦合单层WS2和光子晶体的混合器件的超快响应：光诱导库仑筛选的影响
过渡金属二卤化物（TMD）与光学腔之间的量子相互作用正迅速成为一个吸引人的研究课题，因为这些相互作用是广谱的光学现象的基础。在这里，我们制造了一个简单的装置，其中光子晶体（PhC）平板和单层二硫化钨（WS 2）。稳态角分辨光谱法和瞬态吸收显微镜（TAM）均用于研究该器件的耦合特性。具体而言，在混合装置中观察到抗交叉分散，表明Rabi分裂为40.2meV。在近共振激发下，这种极化子器件的瞬态吸收（TA）谱中出现了新形成的光谱特征，随后证明是上层混合激子-极化子态的标志。此外，通过仔细分析裸WS 2和WS 2 -PhC极化装置在非共振和近共振状态下激发的超快响应，发现非平衡热衰减在单层WS 2中引起库仑筛选。，这对激子-极化子的形成有重要影响。这项工作的结果不仅可以增强当前对强光-质耦合机制中光物理的理解，而且可以为定制基于TMD的相干设备的开发奠定基础。
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