Integration of quantum dots at the tips of single plasmonic bipyramid nanoantennas for strong coupling at room temperature

• URL: http://arxiv.org/abs/2511.03409v1
• Date: Wed, 05 Nov 2025 12:21:31 GMT
• Title: Integration of quantum dots at the tips of single plasmonic bipyramid nanoantennas for strong coupling at room temperature
• Authors: Kseniia Mamaeva, Hodjat Haijan, Carolyn Elliott, Hannah Killeen, Teodora Faraone, Larisa Florea, Colm Delaney, A. Louise Bradley,
• Abstract summary: We present room temperature strong coupling between QDs and a single gold nano-bipyramid (BPs)<n>The selection of the bipyramid plasmonic nanocavity offers access to a single hotspot with a very small mode volume.<n>Results indicate a scalable platform for solid-state quantum technologies with colloidal QDs.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Achieving strong coupling between excitons of colloidal semiconductor quantum dots (QDs) and localized surface plasmon polaritons (LSPs) is critical for advanced room-temperature quantum emitter and sensing applications. A key challenge is to have precise control of the emitters position with respect to an individual plasmonic nanostructure. Here, we present room temperature strong coupling between QDs and a single gold nano-bipyramid (BPs). The selection of the bipyramid plasmonic nanocavity offers access to a single hotspot with a very small mode volume. The localization of QDs at a single hotspot is achieved via plasmon-triggered two-photon polymerization. This technique exploits the enhanced electric field at the BP tip to selectively polymerize a photosensitive QD-containing formulation. Room-temperature scattering spectra of a 3-QD-BP system reveal Rabi splitting of 349.3 meV and a coupling strength of 175.68 meV. The with distinct anti-crossing behavior is confirmed by simulations. This approach simplifies QD integration for strong coupling systems compared to previous methods. These results indicate a scalable platform for solid-state quantum technologies with colloidal QDs, enabling explora-tion of exciton-plasmon interactions and further advance-ment of applications in quantum optics and quantum sensing under ambient conditions.

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