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Polarization-Dependent Purcell Enhancement on a Two-Dimensional h-BN/WS 2 Light Emitter with a Dielectric Plasmonic Nanocavity.

Bowen DuYu LiMeiling JiangHongbo ZhangLishu WuWen WenZheng LiuZheyu FangTing Yu
Published in: Nano letters (2022)
Integrating two-dimensional (2D) transition-metal dichalcogenides (TMDCs) into dielectric plasmonic nanostructures enables the miniaturization of on-chip nanophotonic devices. Here we report on a high-quality light emitter based on the newly designed 2D h-BN/WS 2 heterostructure integrated with an array of TiO 2 nanostripes. Different from a traditional strongly coupled system such as the TMDCs/metallic plasmonic nanostructure, we first employ dielectric nanocavities and achieve a Purcell enhancement on the nanoscale at room temperature. Furthermore, we demonstrate that the light emission strength can be effectively controlled by tuning the polarization configuration. Such a polarization dependence meanwhile could be proof of the resonant energy transfer theory of dipole-dipole coupling between TMDCs and a dielectric nanostructure. This work gains experimental and simulated insights into modified spontaneous emission with dielectric nanoplasmonic platforms, presenting a promising route toward practical applications of 2D semiconducting photonic emitters on a silica-based chip.
Keyphrases
  • energy transfer
  • room temperature
  • quantum dots
  • high throughput
  • transition metal
  • single molecule
  • ionic liquid
  • high resolution
  • visible light
  • label free
  • atomic force microscopy
  • high speed