Giant Photoluminescence Enhancement of Monolayer WSe2 Using a Plasmonic Nanocavity with On-Demand Resonance

Chenyang Li, Huan Luo, Liping Hou, Qifa Wang, Kaihui Liu, Xuetao Gan, Jianlin Zhao, Fajun Xiao

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Monolayer transition metal dichalcogenides (TMDs) are considered promising building blocks for next-generation photonic and optoelectronic devices, owing to their fascinating optical properties. However, their inherent weak light absorption and low quantum yield severely hinder their practical applications. Here, we report up to 18000-fold photoluminescence (PL) enhancement in a monolayer WSe2-coupled plasmonic nanocavity. A spectroscopy-assisted nanomanipulation technique enables the assembly of a nanocavity with customizable resonances to simultaneously enhance the excitation and emission processes. In particular, precise control over the magnetic cavity mode facilitates spectral and spatial overlap with the exciton, resulting in plasmon-exciton intermediate coupling that approaches the maximum emission rate in the hybrid system. Meanwhile, the cavity mode exhibits high radiation directivity, which overwhelmingly directs surface-normal PL emission and leads to a 17-fold increase in the collection efficiency. Our approach opens up a new avenue to enhance the PL intensity of monolayer TMDs, facilitating their implementation in highly efficient optoelectronic devices.

Original languageEnglish
Pages (from-to)5879-5885
Number of pages7
JournalNano Letters
Volume24
Issue number19
DOIs
StatePublished - 15 May 2024

Keywords

  • Fano resonance
  • Purcell effect
  • directionality
  • monolayer WSe
  • photoluminescence enhancement
  • plasmonic nanocavity

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