Mr. Li Long Qiu Profile

Li Long Qiu

at Capital Normal Univ

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Proceedings Article | 8 July 2022 Paper

Nanowire dimers enhance light-matter interactions in monolayer MoSe2

Lilong Qiu, Ze Li, Qingzhang You, Peijie Wang

Proceedings Volume 12283, 1228308 (2022) https://doi.org/10.1117/12.2616201

KEYWORDS: Nanowires, Silver, Plasmonics, Luminescence, Excitons, Finite-difference time-domain method, Raman spectroscopy, Quantum efficiency, Nanostructures, Absorption

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Recently, monolayer transition metal dichalcogenides (TMDs) with structures similar to graphene have emerged as a promising alternative material for integrated optoelectronic devices. However the low light absorption and low photoluminescence quantum yield of monolayer TMDs limit the interaction between light and matter. The plasmonic nanostructure can confine light into the nanometer scale, thus greatly enhancing the electric field intensity and significantly enhancing the interaction between light and matter. Here, we constructed the plasmonic nanocavities comprised of monolayer MoSe₂ and silver nanowire dimer, and studied the photoluminescence (PL) properties of monolayer MoSe₂ enhanced by Purcell effect. The results show that the PL intensity of the composite system composed of MoSe2 and silver nanowire dimer is three times stronger than that of bare MoSe₂ when excited by 532 nm laser. At the same time, we further proved that the nanowire dimer could enhance the PL strength of TMDs by PL mapping. In addition, we use finite difference time domain (FDTD) software simulate the electromagnetic field intensity distribution of the triangular-linear plasmonic cavity formed by the silver nanowires dimer and the substrate. The results demonstrate that the PL intensity of monolayer MoSe₂ was enhanced by Purcell effect. The theory explains the experimental results well, indicates that the system can be used as a new structure to enhance PL of TMDs. The nanowire dimer-monolayer transition metal dichalcogenides complex system presents new possibilities for efficient photodetectors, solar cells and two-dimensional material-based light-emitting devices.

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