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Cryogenic packaging of an optomechanical crystal
Optics Express
|November 6, 2019
Summary
We developed a simple optical coupling method for low-temperature experiments, achieving 25% fiber-to-chip efficiency at 7 mK without cryogenic alignment. This technique is vital for scalable quantum photonic technologies.
Area of Science:
- Cryogenic Engineering
- Integrated Photonics
- Quantum Technology
Background:
- Scalable photonic packaging techniques are crucial for low-temperature experiments.
- Existing methods often lack compatibility with cryogenic environments.
- Simplified optical coupling is needed for integrated photonics at low temperatures.
Purpose of the Study:
- To demonstrate a simplified optical coupling technique for low-temperature integrated photonics.
- To achieve efficient optical coupling at millikelvin temperatures without in-situ alignment.
- To enable scalable integration of optical technologies in cryogenic settings.
Main Methods:
- Utilized angle-polished optical fibers.
- Glued fibers directly to the surface of a silicon optomechanical crystal chip.
- Performed measurements within a dilution refrigerator at 7 mK.
Main Results:
- Achieved 25% coupling efficiency from optical fiber to silicon optomechanical crystal.
- Demonstrated successful coupling at an ultra-low temperature of 7 mK.
- Eliminated the need for in-situ optical alignment at cryogenic temperatures.
Conclusions:
- The developed technique simplifies optical coupling for low-temperature integrated photonics.
- This method is broadly applicable to low-temperature optical physics and quantum photonic technologies.
- It circumvents the need for optical alignment in challenging cryogenic environments, enabling scalable integration.
