Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Perovskite quantum dots (PQDs), particularly those made of CsPbBr₃, hold great promise for quantum information processing as wavelength-tunable single photon sources with room-temperature operation. However, their deterministic on-chip integration with nanophotonic structures remains a major challenge, limited by their random spatial distribution and non-directional emission. In this study, we propose a deterministic integration method using a two-step electron beam lithography process to precisely position individual CsPbBr₃ PQDs within the mode volume of plasmonic ring cavities. Simulations indicate a strong field enhancement within the cavity, to boost photon emission rates via the Purcell effect and improve the quantum efficiency of the CsPbBr₃ PQDs. Experimentally, CsPbBr₃ PQD ensembles coupled to the plasmonic cavities exhibit a fourfold enhancement in photoluminescence (PL) intensity and a threefold reduction in PL lifetime. We demonstrate that a coupled system achieves stable single CsPbBr₃ PQD emission at cryogenic temperatures with a two-fold reduction in PL lifetime. This work provides a scalable and deterministic approach for the integration of PQDs into nanophotonic circuits and opens up opportunities for their application in on-chip quantum technologies.
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