Publication date: 21st July 2025
Individual quantum dots (QDs) serve as inherent sources for quantum states of light such as single photons and entangled photon pairs. Ideally, under cryogenic conditions, their radiation is fully coherent – maintaining a constat phase relation throughout the emission lifetime. Often, however, the interaction of excited electrons with the lattice limits the coherence lifetime to the picosecond timescale. Experimentally, such a timescale necessitates the use of pump-probe measurements with ultrashort laser pulses. While the generation of short pulses is hardly a novelty, applying them to the sensitive spectroscopy of single nano objects is a highly challenging task. Here, we present the first transient-transmission experiments directly measuring the coherent dynamics of excitons in an individual epitaxial CdSe QD.
Using a highly stable femtosecond Er:fiber laser source, we generate the pump and probe beams that are focused through a high-numerical-aperture objective within an optical cryostat (T=1.6 K). Exciting well above the lowest-energy transition (
The unprecedented capability of our setup to expose the full energy landscape of a single confined exciton and its dynamics following excitation promises to bring to light new physics in the realm of nano and quantum optics.
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.
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.
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.