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Nanoscale Gap-Plasmon-Enhanced Superconducting Photon Detectors at Single-Photon Level
Jing-Wei Yang1,2, Tzu-Yu Peng1,2, Daniel D A Clarke3
1Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan.
Nano Letters
|October 31, 2023
Summary
Researchers developed novel superconducting microwire photon detectors (SMPDs) with plasmon resonators, achieving 98% photon detection efficiency for visible light. This breakthrough enhances ultrasensitive single-photon detection for quantum technologies.
Area of Science:
- Quantum Optics
- Materials Science
- Photonics
Background:
- Superconducting single-photon detectors (SSPDs) are crucial for detecting light at the single-photon level.
- Efficient light coupling, especially for visible wavelengths, remains a significant challenge for SSPD performance.
- Existing SSPDs often struggle with polarization sensitivity, limiting their application range.
Purpose of the Study:
- To develop an efficient method for visible light coupling in SSPDs.
- To enhance the photon detection efficiency (PDE) of superconducting detectors.
- To maintain detector performance characteristics like polarization insensitivity.
Main Methods:
- Integration of niobium nitride (NbN) superconducting microwire photon detectors (SMPDs) with gap-plasmon resonators.
- Operation of plasmonic SMPDs at 9 K (approximately 0.64Tc).
- Characterization of the hot-belt effect and its influence on the phonon-electron interaction factor (γ).
Main Results:
- Achieved a record photon detection efficiency of 98% for visible light.
- Demonstrated polarization-insensitive detection capabilities.
- Observed a 233-fold increase in the phonon-electron interaction factor (γ) due to the hot-belt effect at resonance under continuous wave (CW) illumination.
Conclusions:
- The novel plasmonic SMPDs overcome previous limitations in visible light coupling for SSPDs.
- The enhanced phonon-electron interaction significantly boosts detector performance.
- This technology offers new avenues for ultrasensitive single-photon detection in quantum information processing, quantum optics, imaging, and sensing.
