Spontaneous emission enhancement in strain-induced WSe2 monolayer-based quantum light sources on metallic surfaces

Laxmi Narayan Tripathi*, Oliver Iff, Simon Betzold, Łukasz Dusanowski, Monika Emmerling, Kihwan Moon, Young Jin Lee, Soon Hong Kwon, Sven Höfling, Christian Schneider

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Atomic monolayers of transition metal dichalcogenides represent an emerging material platform for the implementation of ultracompact quantum light emitters via strain engineering. In this framework, we discuss experimental results on creation of strain induced single photon sources using a WSe2 monolayer on a silver substrate, coated with a very thin dielectric layer. We identify quantum emitters that are formed at various locations in the sample. Their emission is highly linearly polarized, stable in linewidth, and decay times down to 100 ps are observed. We provide numerical calculations of our monolayer-metal device platform to assess the strength of the radiative decay rate enhancement by the presence of the plasmonic structure. We believe that our results represent a crucial step toward the ultracompact integration of high performance single photon sources in nanoplasmonic devices and circuits.

Original languageEnglish
Pages (from-to)1919-1926
Number of pages8
JournalACS Photonics
Volume5
Issue number5
Early online date4 Apr 2018
DOIs
Publication statusPublished - 16 May 2018

Keywords

  • Atomically thin materials
  • Light-matter coupling
  • Plasmon
  • Quantum emitter
  • Transition metal dichalcogenide

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