Strong coupling between quantum dots and dielectric microdisks at room temperature

Area of Science:

• Optical Physics
• Materials Science
• Quantum Optics

Background:

• Coupling emitters with optical microcavities is crucial for controlling light-matter interactions.
• Dielectric microcavities offer promising platforms for enhanced optical phenomena.

Purpose of the Study:

• Investigate strong coupling between colloidal quantum dots and a dielectric microdisk cavity at room temperature.
• Explore the formation of quasi-bound states in the continuum (qBIC) in hybrid refractive index structures.
• Analyze the Rabi splitting energy and coupling strength.

Main Methods:

• Fabrication of microdisks using a low-refractive-index polymer on a high-refractive-index substrate.
• Utilizing destructive interference to form qBIC.
• Matching qBIC modes to quantum dot exciton energies.
• Measuring angle-resolved photoluminescence spectra.

Main Results:

• Achieved strong coupling between colloidal quantum dots and the microcavity at room temperature.
• Observed quasi-bound states in the continuum due to the hybrid refractive index structure.
• Obtained a Rabi splitting energy of up to 62 meV.
• Analyzed photoluminescence spectra and coupling strength at different quantum dot positions.

Conclusions:

• Demonstrated efficient strong coupling in a colloidal quantum dot-microcavity system at room temperature.
• The hybrid refractive index structure supports qBIC, enabling enhanced light-matter interaction.
• The findings pave the way for advanced quantum optical devices.