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On-Chip Plasmonic Slit-Cavity Platform for Room-Temperature Strong Coupling with Deterministically Positioned
Jin Qin1, Benedikt Schurr1, Patrick Pertsch1
1Nano-Optics and Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg and Röntgen Research Center for Complex Material Research, Physics Institute, Am Hubland, Würzburg D-97074, Germany.
Nano Letters
|February 27, 2026
Summary
Researchers achieved strong coupling between quantum dots and plasmonic cavities at room temperature. This breakthrough enables scalable, on-chip quantum photonic devices with potential for future quantum technologies.
Area of Science:
- Quantum optics
- Materials science
- Nanotechnology
Background:
- Strong coupling between quantum emitters and optical cavities is crucial for quantum photonic technologies.
- Achieving this at room temperature in compact, on-chip systems is challenging due to fabrication difficulties and emitter placement precision.
Purpose of the Study:
- To demonstrate a robust quantum plasmonic device for strong coupling at room temperature.
- To develop a scalable and electrically addressable platform for on-chip quantum technologies.
Main Methods:
- Utilized colloidal quantum dots coupled to plasmonic slit cavities.
- Employed dielectrophoresis-based positioning with real-time photoluminescence feedback for parallel device fabrication.
- Integrated electrodes for electrical tuning via the quantum-confined Stark effect.
Main Results:
- Demonstrated clear photoluminescence-resolved Rabi splitting at room temperature.
- Observed device-to-device variations correlating with the number of coupled quantum dots.
- Found that room-temperature spectral diffusion largely overshadowed electrical tuning effects.
Conclusions:
- Established a scalable plasmonic platform for room-temperature quantum technologies.
- Showcased the potential for on-chip integration with optical elements like waveguides.
- Highlighted the feasibility of deterministic quantum emitter-cavity coupling using advanced fabrication techniques.
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