thin film silicon on sapphire---Intermodal microwave-to-optical transduction using silicon-on-sapphire optomechanical ring resonator

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Intermodal Microwave-to-Optical Transduction Using Silicon-on-Sapphire Optomechanical Ring Resonators.pdf

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The article introduces a microwave-to-optical transduction device based on a silicon-on-sapphire (SOS) optomechanical ring resonator (OMR). The device achieves high-efficiency conversion between microwave and optical signals, an essential step for scaling quantum systems. The OMR design utilizes resonant Brillouin scattering, where the interaction of microwave and optical modes through phononic modes enables the transduction. Key features include:

1. SOS Platform: The use of SOS improves thermal management and is compatible with superconducting qubits, addressing limitations seen in earlier Si-on-SiO2 designs.

2. Triple Resonance: The OMR supports three resonances (two photonic and one phononic mode), enhancing the coupling efficiency for microwave-to-optical conversion, achieving a coupling rate of Gb = 3.6 GHz (mW)−1/2.

3. Multichannel Operation: The device can support wavelength-division multiplexed (WDM) operation, enabling scalable systems.

4. Experimental Validation: The system demonstrated microwave-to-optical conversion with a transduction efficiency of 1.5 × 10−5 at 10 mW optical power and a peak conversion efficiency of 1.2% at 3.6 mW microwave power.

The results highlight SOS as a promising material platform for quantum transduction, offering benefits like improved heat dissipation, compatibility with superconducting devices, and the potential for high-performance optomechanical quantum transducers.