Ultrafast modulation of valley dynamics in multiple WS₂ − Ag gratings strong coupling system

1.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
2.
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China
3.
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian, Beijing, 100084, China

Funds: This work was supported by the National Key Research and Development Program of China and the National Natural Science Foundation of China (NSFC) under Grants 21903035, 22073037, 21773087, 12074141, 61960206003 and Jilin Provincial Science and Technology Development Project (20210509038RQ).

摘要

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Abstract: Strong light-matter interactions in two-dimensional transition metal dichalcogenides (TMDCs) with robust spin-valley degrees of freedom open up the prospect of valleytronic devices. A thorough understanding on the dynamics of the valley polarizations in the strong coupling regime is urgently required. Here, multiple polarized TMDCs-SPPs hybrid systems were constructed by combining monolayer WS₂ flakes to linear, circular, and spiral Ag gratings, resulting in linear and circular polarized modulation on the coherent hybrid states, respectively. Particularly, valley polaritons can be tailored asymmetrically by chiral strong coupling regime. Furthermore, the dynamics of the polarized polaritons were directly analyzed by transient absorption (TA) measurement. Both of the linear and circular polarization difference in the TA spectra can be retained for a remarkable long time, leading to a polarized PL even at room temperature. More importantly, in the chiral strong coupled WS₂-spiral Ag grating devices, the mechanism of the asymmetrical valley-polarized PL (p _σ+ = 14.9% and p _σ- = 10.8%) is proved by the opposite valley polarization dynamics in the circularly polarized TA spectra. The multiple polarization modulation in monolayer TMDCs-SPPs strong coupling devices could provide a viable route toward multiple polarization polaritonic devices.
- Strong coupling /
- Polarization /
- Valley dynamics /
- Surface plasmon polaritons /
- Transition metal dichalcogenides

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参考文献(58)

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