Coupled-mode induced transparency via Ohmic heating in a single polydimethylsiloxane-coated microbubble resonator

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Coupled-mode induced transparency (CMIT) is an optical phenomenon with potential applications in sensing and quantum information.
• Microcavity resonators offer enhanced light-matter interaction for optical devices.
• Hybrid materials provide unique optical properties not achievable with single materials.

Purpose of the Study:

• To demonstrate a novel approach for achieving controllable coupled-mode induced transparency (CMIT).
• To utilize a hybrid polydimethylsiloxane (PDMS)-coated silica microbubble resonator for CMIT.
• To explore the application of this platform in label-free biosensing and quantum information processing.

Main Methods:

• Fabrication of a hybrid microbubble resonator by coating a silica microbubble with PDMS.
• Integration of a gold (Au) microwire into the hollow channel of the microbubble resonator.
• Utilizing the Au microwire as a microheater to induce Ohmic heating and tune optical properties.

Main Results:

• Demonstration of coupled-mode induced transparency (CMIT) in the hybrid microcavity.
• Observation of coexistence of different radial order modes with opposite thermal sensitivities due to PDMS.
• Controllable tuning of resonance frequencies and frequency detuning for achieving CMIT via thermal effects.

Conclusions:

• The developed hybrid microbubble resonator provides an efficient and convenient platform for controllable CMIT.
• The unique thermo-optic properties of PDMS enable precise control over optical modes.
• This technology holds promise for advanced applications in label-free biosensing and quantum information processing.