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Investigating spectral enhancement of monolayer MoS2 coupled with Ag nanowires gap-mode surface plasmons

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Abstract

The combination with surface plasmons (SPs) nanostructures is an effective method to improve the optical properties of two-dimensional (2D) materials such as molybdenum disulfide (MoS2). Silver nanowire (Ag NW) is one of the most important SPs materials because of its tunable SPs resonance characteristics from visible light to near-infrared light. SPs can effectively confine the light field to the nanometer scale for propagation and localization, breaking the limit of optical diffraction, and the distribution of its electromagnetic field often depends on the dielectric environment. The existence of the gap-mode SPs makes the electromagnetic field between the Ag NWs coupled, so the double Ag NWs can produce additional electromagnetic field enhancement than the single Ag NW. Here, the gap-mode SPs of two different positional relationships of Ag NWs were studied through theoretical simulation, and the increase in the field enhancement factor was obtained as a function of gap distance. It is experimentally confirmed that the Raman and photoluminescence intensities of monolayer MoS2 are enhanced by the coupling of gap-mode SPs, and the effects of doping and stress are excluded. The results are helpful to better understand the gain mechanism of gap-mode SPs on the optical properties of 2D materials, and provide a reference for the design of new SPs nanostructures.

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Acknowledgements

The authors thank the support from the Jiangsu Agriculture Science and Technology Innovation Fund (No. CX(21)1007).

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Authors and Affiliations

  1. Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices, School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Weibin Zhang, Cunwei Kong, Chunming Ji, Xinfeng Zhang & Quan Wang

  2. Jiangsu Zorrun Semiconductor Co., Ltd, Nantong, 226500, China

    Xinfeng Zhang

  3. State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Shanghai, 200050, China

    Quan Wang

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  1. Weibin Zhang
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  3. Chunming Ji
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  4. Xinfeng Zhang
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Contributions

Formal analysis, investigation: Weibin Zhang; Data curation: Cunwei Kong; Material characterization: Chunming Ji; Evaluation of results and editing: Xinfeng Zhang; Supervising, writing—review & editing: Quan Wang.

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Correspondence to Quan Wang.

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Zhang, W., Kong, C., Ji, C. et al. Investigating spectral enhancement of monolayer MoS2 coupled with Ag nanowires gap-mode surface plasmons. Appl. Phys. A 130, 241 (2024). https://doi.org/10.1007/s00339-024-07403-z

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