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Constant Pressure Calorimetry

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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
PubMed
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.

Keywords:
Stark effectdielectrophoresisexciton−plasmon couplingplasmonic cavityquantum emitter

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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.