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Transition metal dichalcogenides (TMDC) are a family of atomic-layer two-dimensional materials (2dMs). Many researches have attempted to reinforce the unique properties by incorporating artificially designed nanostructures. Here, a highly photoluminescence (PL) enhancing platform is reported that was formed by combining high-emittance plasmo--photonic metasurfaces with a large-area 2dM, which was a continuous monolayer of TMDC of cm² dimension. It is experimentally demonstrated that the 2dM-PL intensity at room temperature was enhanced by more than 1030-fold in comparison with that observed on the flat gold film regions. The enhancement is associated with spectral transformation indicating a resonant effect of the metasurfaces. It is moreover revealed that the confocal PL image originates from a coherent single-mode emission that forms a photon number distribution obeying the Poisson probability distribution. Thus, the 2dM-fused metasurfaces function as efficient coherent quantum light sources. PL decay-time analysis also reveals the coexistence of two components in the enhanced PL. The fast component exhibits a lifetime of 18 ps whereas the slow component decays at 4.4 ns. Both components are most likely to undergo radiative processes, which indicates that metal-induced PL quenching is suppressed on these 2dM-fused metasurfaces. The long lifetime component is ascribed to an excitonic intervalley transition.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: 2D materials, transition metal dichalcogenide, tungsten disulfide, plasmo-photonic metasurface, luminescence enhancement, Raman-scattering enhancement

Date published: 2024-04-03

Publisher: Wiley

Journal:

• Advanced Optical Materials (ISSN: 21951071) vol. 12 issue. 17 2303309

Funding:

• Japan Society for the Promotion of Science JP20K21134

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

MDR DOI:

First published URL: https://doi.org/10.1002/adom.202303309

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Updated at: 2024-06-19 12:30:14 +0900

Published on MDR: 2024-06-19 12:30:14 +0900