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Spontaneous parametric down conversion without poling for silicon carbide and lithium niobate photonics
Tim F Weiss1, Hamed Arianfard1, Yang Yang1
1Quantum Photonics Laboratory and Centre for Quantum Computation and Communication Technology, RMIT University, Melbourne, VIC, 3000, Australia.
Scientific Reports
|March 25, 2025
Summary
Researchers developed a new device architecture for spontaneous parametric down-conversion (SPDC) photon sources that eliminates the need for periodic poling. This innovation simplifies fabrication and broadens material compatibility for quantum photonics applications.
Area of Science:
- Quantum Optics
- Materials Science
- Nanophotonics
Background:
- State-of-the-art spontaneous parametric down-conversion (SPDC) photon sources rely on periodic poling to meet phase-matching conditions.
- Periodic poling is limited to specific materials and adds fabrication complexity, hindering scalability.
Purpose of the Study:
- To present a novel device architecture for SPDC that circumvents the need for periodic poling.
- To demonstrate the feasibility of this architecture in 4H Silicon Carbide on-insulator and thin-film Lithium Niobate on-insulator platforms.
Main Methods:
- Utilizing a design based on mode conversion and subsequent modal phase-matched SPDC.
- Performing explicit designs and calculations for specific material platforms.
Main Results:
- The proposed architecture enables SPDC across a wide range of frequencies without periodic poling.
- Successful designs and calculations for 4H Silicon Carbide on-insulator and thin-film Lithium Niobate on-insulator are presented.
- The approach is compatible with CMOS fabrication.
Conclusions:
- This new architecture simplifies the fabrication of SPDC photon sources.
- It removes the limitations associated with periodic poling, paving the way for scalable quantum photonics.
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