Deterministic Integration of CsPbBr3 Quantum Dots with Plasmonic Ring Microcavities

TL;DR

This paper presents a deterministic method for integrating CsPbBr3 quantum dots into plasmonic ring microcavities, enhancing photon emission and efficiency for quantum photonic applications.

Contribution

It introduces a two-step electron beam lithography process for precise placement of quantum dots in nanophotonic structures, enabling scalable quantum photonic device fabrication.

Findings

Four-fold increase in photoluminescence intensity

Three-fold reduction in fluorescence lifetime at room temperature

Two-fold reduction in radiative lifetime at cryogenic temperatures

Abstract

Perovskite quantum dots hold great promise for quantum information processing as wavelength-tunable single photon sources operable over a broad temperature range. However, their deterministic integration into nanophotonic structures remains a major challenge, limited by their random spatial distribution and non-directional emission. In this work, we employ a two-step electron beam lithography process to deterministically place CsPbBr3 quantum dots within the mode volume of plasmonic ring microcavities. Simulations predict strong field enhancement within the cavity, boosting photon emission rates via the Purcell effect and improving the quantum efficiency of the emitters. Experimentally, coupling ensembles of CsPbBr3 quantum dots to the cavities results in a four-fold enhancement in photoluminescence intensity and a three-fold reduction in fluorescence lifetime at room temperature. Single-emitter coupling is further investigated at cryogenic temperatures, leading to a two-fold reduction in radiative lifetime. These results demonstrate a scalable approach for the integration of perovskite quantum dots into nanophotonic cavities and quantum photonic circuits.