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2D materials such as transition metal dichalcogenides (TMDCs) are a new class of atomic-layer materials possessing optical and electric properties that significantly depend on the number of layers. Electronic transitions can be manipulated in artificial resonant electromagnetic (EM) fields using metasurfaces and other designed nanostructures. Here, we demonstrate prominently resonant enhancement in the photoluminescence (PL) of atomic monolayer, WS$_2$, doped with a small quantity of Mo. The excitonic PL showed a strong enhancement effect on a higher-order magnetic resonance of all-dielectric metasurfaces consisting of periodic arrays of Si nanopellets. The PL intensity witnessed a 300-fold enhancement compared to the reference PL intensity on a flat silicon dioxide (SiO$_2$) layer, which suggests a drastic change in the dynamics of photoexcited states. Confocal PL microscopy and the analysis revealed that the single photons were efficiently emitted from the TMDC monolayer on the metasurface. Furthermore, examining the PL lifetime in the ps and ns timescales clarified two exponential components at the prominent exciton PL: a short-time component decaying in 22 ps and a long-time component lasting over 10 ns. Therefore, we can infer that the radiative components were significantly activated in the TMDC monolayer on the metasurfaces in comparison to the reference monolayer on a flat SiO$_2$ layer.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: 2D materials, transition metal dichalcogenide, tungsten disulfide, all-dielectric metasurface, enhanced photoluminescence, resonance enhancement, coherent photon emitter

Date published: 2024-01-17

Publisher: Walter de Gruyter GmbH

Journal:

• Nanophotonics (ISSN: 21928614) vol. 13 issue. 1 p. 95-105

Funding:

• JSPS JP20K21134 (KAKENHI)
• NIMS (The Support System for Curiosity-Driven Research)
• ATLA JPJ004596 (Innovative Science and Technology Initiative for Security)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1515/nanoph-2023-0672

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Updated at: 2024-04-03 12:30:19 +0900

Published on MDR: 2024-04-03 12:30:19 +0900