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Continuously-tunable light-matter coupling in optical microcavities with 2D semiconductors.

Franziska Wall1, Oliver Mey1, Lorenz Maximilian Schneider1

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Researchers demonstrate tunable light-matter coupling in microcavities using transition-metal dichalcogenides (TMDCs). This enables control over exciton-polaritons and Rabi splitting for advanced optical applications.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Distinguishing between weak and strong light-matter coupling is crucial for quantum technologies.
  • Open optical Fabry-Pérot microcavities offer a platform for exploring these regimes.
  • Transition-metal dichalcogenides (TMDCs) like WS2 possess strong exciton properties suitable for coupling.

Purpose of the Study:

  • To theoretically investigate tunable light-matter coupling in open microcavities.
  • To demonstrate the feasibility of achieving strong coupling and exciton-polariton formation at room temperature.
  • To propose methods for actively controlling coupling strength and Rabi splitting.

Main Methods:

  • Utilized the transfer-matrix method for optical simulations.
  • Explored tunable cavity length and angle-dependencies for resonance control.
  • Investigated the role of a PMMA spacer layer for field strength manipulation.

Main Results:

  • Simulations show active tailoring of coupling strength by adjusting field intensity at exciton positions.
  • Demonstrated the potential for real-time adjustable Rabi splitting and switching between coupling regimes.
  • The proposed structure is material-independent, applicable to quantum dots, molecules, and quantum wells.

Conclusions:

  • Tunable light-matter coupling in microcavities is achievable, enabling control over exciton-polaritons.
  • The proposed system facilitates room-temperature Rabi splitting and regime switching.
  • Potential applications include polariton-chemistry, optical sensing, and exploring topological properties at the exceptional point.