Proceedings of SPIE
Wavelength-resolved Purcell enhancement of PbS/CdS quantum dots measured on a chip-based 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
Future quantum optical networks will require an integrated solution to multiplex suitable sources and detectors on a low-loss platform. Here we combined superconducting single-photon detectors with colloidal PbS/CdS quantum dots (QDs) and low-loss silicon nitride passive photonic components to show their combined operation at cryogenic temperatures. Using a planar concave grating spectrometer, we performed wavelength-resolved measurements of the photoluminescence decay of QDs, which were deterministically placed in the gap of plasmonic antennas, in order to improve their emission rate. We observed a Purcell enhancement matching the antenna simulations, with a concurrent increase of the count rate on the superconducting detectors.