Bulgarini, G.

Chandrasekaran, Vigneshwaran

Elsinger, Lukas

Gourgues, R.

Hens, Zeger

Maes, Jorick

Van Thourhout, Dries

Zadeh, I. E.

Zwiller, V.

English

Ghent University Academic Bibliography

Photonics Research Group, INTEC-Department, Ghent University-IMECCenter for Nano- and Biophotonics (NB-Photonics), Ghent Universityhttp://photonics.intec.ugent.beOn-chip Spectroscopy of PbS/CdS Colloidal QDs using Superconducting Nanowire Single Photon Detectors (SNSPDs) on a Silicon Nitride Photonic PlatformLukas Elsinger1*, Ronan Gourgues2*, Iman E. Zadeh2, Jorick Maes3, Vigneshwaran Chandrasekaran3, Gabriele Bulgarini2, Val Zwiller4, Zeger Hens3 and Dries Van Thourhout1*equal contribution lukas.elsinger@ugent.be Application of on-chip quantum emitters and single-photon detectorsEmission enhancement of PbS/CdS QDs using plasmonic gap antennas measured with integrated superconducting nanowire detectorsLow loss (<1dB/cm @1300 nm) low fluorescence PECVD silicon nitride waveguide circuits on a photonic chip inside a He cryostat @ 4K. An average enhancement factor of 50 and a maximum of 125 was obtained by area-averaging the decay times extracted from a bi-exponential fit of the fluorescence decay trace.Single photon source for quantum key distribution (competing with attenuated laser + decoy state protocols):High single-photon rate, but relaxed conditions for photon purity g2(0), average photon number per pulse <n> and indistinguishability compared to (linear) optical quantum computingIntegration platform for post-processingsensitive quantum emitters onto waveguides coupled to high-quality SNSPD detectors grown on a flat substrate FDTD Simulation: Up to 500-fold radiative enhancement, QE >70%100 nmAu bowtie antennaPbS/CdS QDsSEM pictures show a good overlay accuracy of colloidal QDs post-processed on plasmonic bowtie antennas on top of SiN waveguides, suggesting that we should achieve higher average radiative enhancement by reducing the size of the QD patches.1 Photonics Research Group, Ghent University – imec, 9052 Ghent, Belgium2 Single Quantum B.V., 2628 CH Delft, Netherlands 3 Physics and Chemistry of Nanostructures, Ghent Universi y, 9000 Ghent, Belgium4Department of Ap lied Physics, KTH, Stockholm 106 91, SwedenPump filter to suppressthe 700 nm excitationEvanescently coupled SNSPD (20 ps time jitter)Colloidal QDs on top of  plasmonic gap antennas Fluorescence lifetime spectroscopy using an integrated planar concave gratingrevealed a wavelength-dependence of the PbS/CdSQDs luminescence decay for an embedded film.The PbS/CdS QD emission spectrum at 4K overlaps with the antenna resonance simulated using dimensions from SEM images. This was confirmed by separate transmission measurements not shown here.  

On-chip spectroscopy of PbS/CdS colloidal QDs using superconducting nanowire single photon detectors (SNSPDs) on a silicon nitride photonic platform

https://biblio.ugent.be/publication/8664647/file/8664649.pdf

On-chip spectroscopy of PbS/CdS colloidal QDs using superconducting nanowire single photon detectors (SNSPDs) on a silicon nitride photonic platform

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Ghent University Academic Bibliography