Tunable Multiresonant Microcavity Exciton-Polaritons in Colloidal Quantum Wells

Area of Science:

• Optics and Photonics
• Condensed Matter Physics
• Materials Science

Background:

• Optical microcavities are crucial for confining photons to form exciton-polaritons.
• Precise control over cavity length is essential for efficient exciton coupling, but often limited by compact designs and existing tuning methods.
• Current techniques for resonance tuning may lack resolution or involve complex operations.

Purpose of the Study:

• To introduce a novel multiresonant microcavity array for precise control over cavity resonances.
• To investigate room-temperature exciton-polariton formation using this platform with colloidal quantum wells.
• To demonstrate the potential for developing on-chip polaritonic devices.

Main Methods:

• Fabrication of a multiresonant microcavity array enabling sub-5 nm cavity length variation.
• Utilization of gradient core-crown colloidal quantum wells for stable exciton hosting.
• Investigation of strong coupling regime and Rabi oscillations in the system.

Main Results:

• Achieved full spectral selection of cavity resonances with high precision.
• Demonstrated room-temperature exciton-polariton formation with stable excitons.
• Observed long-lived Rabi oscillations (Q = 3.3) and significant Rabi splitting.
• Showcased control over polariton properties across arrays on a single substrate.

Conclusions:

• The developed microcavity array offers unprecedented control over cavity length and spectral selection.
• The platform facilitates robust room-temperature exciton-polariton formation and strong coupling.
• This technology holds significant promise for the advancement of integrated polaritonic devices.