Integration of Colloidal PbS/CdS Quantum Dots with Plasmonic Antennas and Superconducting Detectors on a Silicon Nitride Photonic Platform
Lukas Elsinger (Universiteit Gent)
Ronan Gourgues (Single Quantum)
Iman E. Zadeh (TU Delft - ImPhys/Optics)
Jorick Maes (Universiteit Gent)
Antonio Guardiani (Single Quantum)
Gabriele Bulgarini (Single Quantum)
Silvania F. Pereira (TU Delft - ImPhys/Optics)
Sander N. Dorenbos (Single Quantum)
Val Zwiller (KTH Royal Institute of Technology)
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Abstract
Single-photon sources and detectors are indispensable building blocks for integrated quantum photonics, a research field that is seeing ever increasing interest for numerous applications. In this work, we implemented essential components for a quantum key distribution transceiver on a single photonic chip. Plasmonic antennas on top of silicon nitride waveguides provide Purcell enhancement with a concurrent increase of the count rate, speeding up the microsecond radiative lifetime of IR-emitting colloidal PbS/CdS quantum dots (QDs). The use of low-fluorescence silicon nitride, with a waveguide loss smaller than 1 dB/cm, made it possible to implement high extinction ratio optical filters and low insertion loss spectrometers. Waveguide-coupled superconducting nanowire single-photon detectors allow for low time-jitter single-photon detection. To showcase the performance of the components, we demonstrate on-chip lifetime spectroscopy of PbS/CdS QDs. The method developed in this paper is predicted to scale down to single QDs, and newly developed emitters can be readily integrated on the chip-based platform.