A5061852345- Quantum Dots Synthesis And Properties
- Advanced Optical Sensing Technologies
- Advanced Fluorescence Microscopy Techniques
- Chalcogenide Semiconductor Thin Films
- Advanced Electron Microscopy Techniques and Applications
- Photonic and Optical Devices
- Molecular Junctions and Nanostructures
- Perovskite Materials and Applications
- Optical Coherence Tomography Applications
- Near-Field Optical Microscopy
- Semiconductor Quantum Structures and Devices
- Spectroscopy Techniques in Biomedical and Chemical Research
- Neuroscience and Neural Engineering
- Photoreceptor and optogenetics research
- Semiconductor Lasers and Optical Devices
- Spectroscopy and Laser Applications
- Force Microscopy Techniques and Applications
- Advanced Memory and Neural Computing
- Silicon Nanostructures and Photoluminescence
- Radical Photochemical Reactions
- Nanocluster Synthesis and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Reproductive tract infections research
- Nanowire Synthesis and Applications
- Carbon Nanotubes in Composites
Weizmann Institute of Science
2019-2023
Tel Aviv University
2017-2018
Hebrew University of Jerusalem
2017
An efficient nanoscale semiconducting optoelectronic system is reported, which optimized for neuronal stimulation: the organic electrolytic photocapacitor. The devices comprise a thin (80 nm) trilayer of metal and p-n nanocrystals. When illuminated in physiological solution, these metal-semiconductor charge up, transducing light pulses into localized displacement currents that are strong enough to electrically stimulate neurons with safe intensities. freestanding, requiring no wiring or...
We report the development of a semiconductor nanorod-carbon nanotube based platform for wire-free, light induced retina stimulation. A plasma polymerized acrylic acid midlayer was used to achieve covalent conjugation nanorods directly onto neuro-adhesive, three-dimensional carbon surfaces. Photocurrent, photovoltage, and fluorescence lifetime measurements validate efficient charge transfer between films. Successful stimulation light-insensitive chick suggests potential use this novel in...
Temporal photon correlation measurement, instrumental to probing the quantum properties of light, typically requires multiple single detectors. Progress in avalanche diode (SPAD) array technology highlights their potential as high performance detector arrays for imaging and number resolving (PNR) experiments. Here, we demonstrate this by incorporating a novel on-chip SPAD with 55% peak detection probability, low dark count rate crosstalk probability 0.14% per detection, confocal microscope....
Super-resolution optical microscopy is a rapidly evolving scientific field dedicated to imaging sub-wavelength sized objects, leaving its mark in multiple branches of biology and technology. While several super-resolution methods have become common tool life science imaging, new methods, supported by cutting-edge technology, continue emerge. One rather recent addition the toolbox, image scanning (ISM), achieves an up twofold lateral resolution enhancement robust straightforward manner. To...
Understanding exciton-exciton interaction in multiply excited nanocrystals is crucial to their utilization as functional materials. Yet, for lead halide perovskite nanocrystals, which are promising candidates nanocrystal-based technologies, numerous contradicting values have been reported the strength and sign of interaction. In this work, we unambiguously determine biexciton binding energy single cesium at room temperature. This enabled by recently introduced single-photon avalanche diode...
Multiply-excited states in semiconductor quantum dots feature intriguing physics and play a crucial role nanocrystal-based technologies. While photoluminescence provides natural probe to investigate these states, room temperature single-particle spectroscopy of their emission has so far proved elusive due the temporal spectral overlap with from singly-excited charged states. Here we introduce biexciton heralded spectroscopy, enabled by single-photon avalanche diode array based spectrometer....
Measurements of photon temporal correlations have been the mainstay experiments in quantum optics. Over past several decades, advancements detector technologies supported further extending correlation techniques to give rise novel spectroscopy and imaging methods. This Perspective reviews evolution these from autocorrelations through multidimensional imaging. State-of-the-art single-photon are discussed, highlighting main challenges unique current perspective usher a new generation modalities.
Coupled colloidal quantum dot molecules (CQDMs) are an emerging class of nanomaterials, manifesting two coupled emission centers and thus introducing additional degrees freedom for designing quantum-dot-based technologies. The properties multiply excited states in these CQDMs crucial to their performance as light emitters, but they cannot be fully resolved by existing spectroscopic techniques. Here we study the characteristics biexcitonic species, which represent a rich landscape different...
In lead halide perovskites (APbX3), the effect of A-site cation on optical and electronic properties has initially been thought to be marginal. Yet, evidence beneficial effects solar cell performance light emission is accumulating. Here, we report that A-cation in soft APbBr3 colloidal quantum dots (QDs) controls phonon-induced localization exciton wavefunction. Insights from ab initio molecular dynamics single-particle fluorescence spectroscopy demonstrate anharmonic lattice vibrations...
Semiconductor nanocrystals feature multiply-excited states that display intriguing physics and significantly impact nanocrystal-based technologies. Fluorescence supplies a natural probe to investigate these states. Still, direct observation of multiexciton fluorescence has proved elusive existing spectroscopy techniques. Heralded Spectroscopy is new tool based on breakthrough single-particle, single-photon, sub-nanosecond spectrometer utilizes temporal photon correlations isolate emission....
Carbon nanotubes (CNTs) and semiconductor nanocrystals (SCNCs) are known to be interesting donor-acceptor partners due their unique optical electronic properties. These exciting features have led the development of novel composites based on these two nanomaterials characterization for use in various applications, such as components sensors, transistors, solar cells biomedical devices. Two approaches covalent noncovalent methods been suggested coupling SCNCs CNTs. Most conjugation used so far...
Temporal photon correlations have been a crucial resource for quantum and quantum-enabled optical science over half century. However, attaining non-classical information through these has typically limited to single point (or at best, few points) at-a-time. We perform here massively multiplexed wide-field correlation measurement using large $500\times500$ single-photon avalanche diode array, the SwissSPAD3. demonstrate performance of this apparatus by acquiring measurements emitters,...
Organic electrolytic photocapacitors transduce light pulses into localized displacement currents that electrically stimulate neurons. These nanoscale devices are freestanding, requiring no wiring, and stable in physiological conditions. In article number 1707292, Yael Hanein, Eric Daniel Głowacki, co-workers successfully photostimulate cultured neurons light-insensitive explanted retinas, paving the way for minimally invasive retinal prosthetics.
Understanding exciton-exciton interaction in multiply-excited nanocrystals is crucial to their utilization as functional materials. Yet, for lead halide perovskite nanocrystals, which are promising candidates nanocrystal-based technologies, numerous contradicting values have been reported the strength and sign of interaction. In this work we unambiguously determine biexciton binding energy single cesium at room temperature. This enabled by recently introduced SPAD array spectrometer, capable...
We demonstrate an approach for super-resolution imaging by combining fluorophore fluctuations analysis with a confocal detector array setup. This combination facilitates obtaining high resolution images without complex experimental setup and prohibitively long data acquisition.
We reintroduce the concept of SOFISM and discuss its practical aspects. demonstrate that supplying a confocal microscope with SPAD array detector enables super-resolution imaging relying on fluorophore blinking within reasonable dwell times.
Semiconductor nanocrystal emission polarization is a crucial probe of physics and an essential factor for nanocrystal-based technologies. While the transition dipole moment lowest excited state to ground well characterized, higher multiexcitonic transitions inaccessible via most spectroscopy techniques. Here, we realize direct characterization doubly-excited relaxation by heralded defocused imaging. Defocused imaging maps pattern onto fast single-photon avalanche diode detector array,...
Coupled colloidal quantum dot molecules are an emerging class of nanomaterials, introducing new degrees freedom for designing dot-based technologies. The properties multiply excited states in these materials crucial to their performance as light emitters but cannot be fully resolved by existing spectroscopic techniques. Here we study the characteristics biexcitonic species, which represent a rich landscape different configurations, such segregated and localized biexciton states. To this end,...
Semiconductor nanocrystal emission polarization is a crucial probe of physics and an essential factor for nanocrystal-based technologies. While the transition dipole moment lowest excited state to ground well characterized, higher multiexcitonic transitions inaccessible via most spectroscopy techniques. Here, we realize direct characterization doubly excited-state relaxation by heralded defocused imaging. Defocused imaging maps pattern onto fast single-photon avalanche diode detector array,...
The emerging field of quantum imaging introduces new methods to overcome classical limitations in optical microscopy. A detection apparatus capable analyzing the signature light, is a crucial component heart any such method. We present novel modality, based on state-of-the-art single photon avalanche diode (SPAD) array confocal setup. This modality enables unprecedented simplicity and scalability temporal correlations. demonstrate potential this approach by measuring correlations sources, as...