Plasmonic Enhancement and Spectroscopy of PbS/CdS QD Emitters on a Silicon Nitride Photonic Platform

Lukas Elsinger^a^,^b, Ronan Gourgues^c, Iman E. Zadeh^d, Jorick Maes^e^,^b, Antonio Guardiani^c, Gabriele Bulgarini^c, Silvania F. Pereira^d, Sander N. Dorenbos^c, Val Zwiller^f, Zeger Hens^e^,^b, Dries Van Thourhout^a^,^b

^aPhotonics Research Group, Ghent University - imec, Belgium, Belgium

^bPhotonics Research Group, Ghent University - imec, Belgium, Belgium

^cSingle Quantum B.V., The Nehterlands, Lausbergstraat 17, Delft, 2628LA, Netherlands

^dOptics Research Group, Delft University of Technology, The Netherlands, Netherlands

^ePhysics and Chemistry of Nanostructures, Ghent University, Belgium, Belgium

^fDepartment of Applied Physics, KTH- Royal Institute of Technology, Stockholm, Sweden, Sweden

Proceedings of Internet Conference for Quantum Dots (iCQD)

Online, Spain, 2020 July 14th - 17th

Organizers: Quinten Akkerman, Raffaella Buonsanti, Zeger Hens and Maksym Kovalenko

Oral, Lukas Elsinger, presentation 103
Publication date: 3rd July 2020

Applications in quantum optics have stringent performance requirements on single-photon sources and detectors, in addition to the need for low-loss passive components. Integrating the building blocks on a chip-based platform can enable scaling up to larger experiments, whilst improving phase stability. A key property of single-photon sources is their radiative lifetime, which can be modified through the high local density of states created by plasmonic antennas.

In recently published work we demonstrate an enhancement of the microsecond lifetime of IR-emitting colloidal PbS/CdS quantum dots (QDs), with a concurrent increase of the count rate. We further show wavelength-resolved measurements of the Purcell enhancement of QDs deterministically positioned in the gap of plasmonic antennas, performed on a single photonic chip. This provides an in-depth analysis of the enhancement and holds promise to wavelength-multiplex multiple single-photon emitters on the same chip. Making use of low-fluorescence silicon nitride with a waveguide loss smaller than 1 dB/cm, we implemented high extinction ratio optical filters and planar concave grating spectrometers. Waveguide-coupled superconducting nanowire single photon detectors (SNSPDs) allowed for highly efficient and low time-jitter single-photon detection. Through a careful analysis of the different contributions to the count rate at the SNSPDs we predict our method to scale down to single QDs. In addition, newly developed emitters can be readily integrated on the chip-based platform. This furthermore enables lifetime-spectroscopy of solution-processed nano-materials at cryogenic temperatures, using a single photonic chip.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.