Publication date: 15th December 2025
Quantum dot (QD) emitters are promising candidates for next-generation display and quantum technologies. However, advancing their optical performance beyond fundamental limitations remains a key scientific challenge. In this work, we present a metal–semiconductor hybrid QD system that enables ultrabright, polychromatic polaritonic emission through nanoscale plasmonic cavities. By harnessing strong coupling between QD excitons and localized plasmons, we achieve color-tunable emission driven by ultrafast Rabi oscillations. We investigate how this interaction seamlessly transitions from weak to strong coupling and even reaches the elusive ultrastrong coupling regime. In addition, we leverage tip-enhanced gradient forces and optical torques in a liquid environment to achieve highly reproducible nano-optical trapping and self-alignment of individual QDs. The trapped and aligned QD exhibits a striking self-induced back-action (SIBA) effect, as unveiled by real-time near-field photoluminescence spectroscopy. This work provides profound insights into light–matter interactions at the nanoscale, offering a new strategy for advanced display technologies and quantum photonics in diverse environments.
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