Polarization-dependent purcell enhancement on a two-dimensional h-BN/WS₂ light emitter with a dielectric plasmonic nanocavity

• Main Authors: Du, Bowen, Li, Yu, Jiang, Meiling, Zhang, Hongbo, Wu, Lishu, Wen, Wen, Liu, Zheng, Fang, Zheyu, Yu, Ting
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Science::Physics::Atomic physics::Solid state physics; Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics; Spontaneous Emission; Dielectric Plasmonic Nanocavity
• Online Access: https://hdl.handle.net/10356/156056
• Institution: Nanyang Technological University

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/WS2 heterostructure integrated with an array of TiO2 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.