Invention:
This invention presents a novel superconducting nanowire single-photon detector (SNSPD) design that significantly enhances photon absorption efficiency by combining waveguide redirection and lateral photonic confinement. The approach increases the effective absorption cross-section of the nanowire without lengthening it—overcoming a key limitation in traditional SNSPD architectures.
Background:
Superconducting nanowire single-photon detectors (SNSPDs) are essential in quantum communication, photon-starved imaging, and ultra-sensitive photon-level sensing due to their high timing resolution and low dark count rates. A central engineering challenge lies in maximizing detection efficiency without increasing the nanowire length, which introduces higher kinetic inductance, slower reset times, and increased risk of latching. This invention addresses these limitations by using grating and guided-mode resonance effects to trap and confine photons, boosting the absorption probability in a compact and scalable form factor.
Applications:
- Quantum communication and cryptography
- Photon-starved imaging and low-light-level detection
- Quantum computing systems
- LIDAR and remote sensing
- Biomedical photon detection
Advantages:
- Higher detection efficiency without increasing nanowire length
- Reduced kinetic inductance and faster reset times
- Lower risk of latching
- Compatible with scalable, lithography-based fabrication
- Compact architecture suitable for integration into photonic platforms
