Photoluminescence-Induced Four-Wave Mixing Generation in a Monolayer-MoS2-Cladded GaN Microdisk Resonator

Integrated photonics are expected to replace the conventional free-space optical systems, yet there remains a challenge of low nonlinear response due to small nonlinear refractive index and short interaction length. Here, the large-area monolayer MoS2 is used to facilitate excellent nonlinear response, and a pump strategy is proposed with respect to the spontaneous four-wave mixing in the visible spectral range. The external pump incident from the top resonates in the GaN microdisk resonator and is thoroughly absorbed by the monolayer MoS2 to generate the four-wave mixing pump via the excitonic photoluminescence. Being driven by the internal photoluminescence pump and enhanced by the microcavity structure, it is validated that the proposed structure well suffices efficient degenerate spontaneous four-wave mixing generation. Since the emission spectrum can be tailored through careful temperature control, this work holds a great potential in various functionalities, not only on-chip visible light sources but also optical field control.

Automated summary

This study utilizes large-area monolayer MoS2 to enhance nonlinear response and proposes a new pump strategy for achieving spontaneous four-wave mixing in the visible spectral range. The structure is driven by excitonic photoluminescence pump for efficient mixing generation, validated by the microcavity structure enhancement. With the emission spectrum controllable through temperature, this work shows great potential for various applications.