A5075524244- Advanced Optical Sensing Technologies
- Advanced Fluorescence Microscopy Techniques
- Optical Imaging and Spectroscopy Techniques
- CCD and CMOS Imaging Sensors
- Photoacoustic and Ultrasonic Imaging
- Spectroscopy Techniques in Biomedical and Chemical Research
- Access Control and Trust
- Quantum Dots Synthesis And Properties
- Optical Coherence Tomography Applications
- Random lasers and scattering media
- Quantum Information and Cryptography
- Analytical Chemistry and Sensors
- Business Process Modeling and Analysis
- Digital Holography and Microscopy
- Image Enhancement Techniques
- Chalcogenide Semiconductor Thin Films
- Security and Verification in Computing
- Chaos-based Image/Signal Encryption
- Advanced Optical Imaging Technologies
- Mechanical and Optical Resonators
- Cloud Data Security Solutions
- Quantum Computing Algorithms and Architecture
- Advanced Fiber Laser Technologies
- Cell Image Analysis Techniques
- Cryptography and Data Security
École Polytechnique Fédérale de Lausanne
2016-2025
Schindler (Switzerland)
2014
Japan External Trade Organization
2013
IBM (United States)
2009-2012
IBM Research - Zurich
2011-2012
ETH Zurich
2011-2012
Delft University of Technology
2012
We present the architecture and three applications of largest resolution image sensor based on single-photon avalanche diodes (SPADs) published to date.The sensor, fabricated in a high-voltage CMOS process, has 512 x 128 pixels pitch 24 μm.The fill-factor 5% can be increased 30% with use microlenses.For precise control exposure for time-resolved imaging, we fast global gating signals define windows as small 4 ns.The uniformity gate edges location is ~140 ps (FWHM) over whole array, while...
While CMOS single-photon avalanche diode (SPAD) technology has steadily advanced, improving noise, timing resolution, and sensitivity, spatial resolution been increasing as well. The increase in the number of pixels made a comprehensive analysis nonuniformity its effects meaningful, allowing more accurate comparison SPAD imagers with other high-end scientific imagers, such electron multiplying charge-coupled device CMOS. A was conducted on 512 × 128 pixel gated imager, where dark...
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....
The Hanbury Brown–Twiss (HBT) effect holds a pivotal place in intensity interferometry and gave seminal contribution to the development of quantum optics. To observe such an effect, both good spectral timing resolutions are necessary. Most often, HBT is observed for single frequency at time due its limitations dealing with multifrequencies simultaneously, halting limiting some applications. Here, we report fast data-driven spectrometer built one-dimensional array single-photon-sensitive...
The LinoSPAD camera system is a modular, compact and versatile time-resolved system, combining linear 256 high fill factor pixel CMOS SPAD (single-photon avalanche diode) sensor with an FPGA (field-programmable gate array) USB 3.0 transceiver board. This modularization permits the separate optimization or exchange of either front-end processing back-end, depending on intended application, thus removing traditional compromise between optimal technology one hand time-stamping other hand....
LinoSPAD is a reconfigurable camera sensor with 256×1 CMOS SPAD (single-photon avalanche diode) pixel array connected to low cost Xilinx Spartan 6 FPGA. The sensor's line of pixels has pitch 24 μm and 40% fill factor. FPGA implements an 64 TDCs histogram engines capable processing up 8.5 giga-photons per second. measures 1.68 mm×6.8 mm each direct digital output connect the chip bonded on carrier PCB motherboard. carry chain based sampled at 400 MHz can generate timestamp every 7.5 ns mean...
We review the advancement of research toward design and implementation quantum plenoptic cameras, radically novel 3D imaging devices that exploit both momentum–position entanglement photon–number correlations to provide typical refocusing ultra-fast, scanning-free, capability devices, along with dramatically enhanced performances, unattainable in standard cameras: diffraction-limited resolution, large depth focus, ultra-low noise. To further increase volumetric resolution beyond Rayleigh...
sCMOS imagers are currently utilized (replacing EMCCD imagers) to increase the acquisition speed in super resolution localization microscopy. Single-photon avalanche diode (SPAD) feature frame rates per bit depth comparable or higher than imagers, while generating microsecond 1-bit-frames without readout noise, thus paving way in-depth time-resolved image analysis. High timing can also be exploited explore fluorescent dye blinking and other photophysical properties, which used for...
The paper presents a camera comprising 512 × 128 pixels capable of single-photon detection and gating with maximum frame rate 156 kfps. photon capture is performed through gated avalanche diode that generates digital pulse upon one-bit counter. Gray levels are obtained multiple counting accumulation, while time-resolved imaging achieved 4-ns window controlled subnanosecond accuracy by field-programmable gate array. sensor, which equipped microlenses to enhance its effective fill factor, was...
Balancing protection and empowerment is a central problem when specifying authorizations. The principle of least privilege, the classical approach to balancing these two conflicting objectives, says that users shall only be authorized execute tasks necessary complete their job. However, there are multiple authorization policies satisfying which one should chosen?
Access control is fundamental in protecting information systems but it also poses an obstacle to achieving business objectives. We analyze this tradeoff and its avoidance the context of modeled as workflows restricted by authorization constraints including those specifying Separation Duty (SoD) Binding (BoD).To begin with, we present a novel approach scoping within with loops conditional execution. Afterwards, consider enforcement's effects on identify notion obstruction, which generalizes...
We report on LinoSPAD2, a single-photon camera system, comprising 512×1 avalanche diode (SPAD) front-end and one or two FPGA-based back-ends. Digital signals generated by the SPADs are processed FPGA in real time, whereas offers full reconfigurability at very high level of granularity both time space domains. The LinoSPAD2 system can process 512 simultaneously through 256 channels, duplicated each back-end, with bank 64 time-to-digital converters (TDCs) operating 133 MSa/s, TDC has...
Fluorescence lifetime imaging microscopy (FLIM) measures fluorescence lifetimes of fluorescent probes to investigate molecular interactions. However, conventional FLIM systems often requires extensive scanning that is time-consuming. To address this challenge, we developed a novel computational technique called light field tomographic (LIFT-FLIM). Our approach acquires volumetric images in highly data-efficient manner, significantly reducing the number steps. We demonstrated LIFT-FLIM using...
Separation of Duties (SoD) aims at preventing fraud and errors by distributing tasks associated authorizations among multiple users. Li Wang [2008] proposed an algebra (SoDA) for specifying SoD requirements, which is both expressive in the requirements it formalizes abstract that not bound to a workflow model. In this article, we bridge gap between specification constraints modeled SoDA their enforcement dynamic, service-oriented enterprise environment. We proceed generalizing SoDA's...
Access control is fundamental in protecting information systems but it can also pose an obstacle to achieving business objectives. We analyze this tradeoff and its avoidance the context of modeled as workflows restricted by authorization constraints, including those specifying Separation Duty (SoD) Binding (BoD). To begin with, we present a novel approach scoping constraints within with loops conditional execution. formalize workflows, their enforcement using process algebra CSP visualize...
This paper presents an efficient Quantum Random Number Generation protocol exploiting the single-photon time of arrival degree freedom. Its realization is based on CMOS avalanche diode array and fast tagging units.
We demonstrate an efficient and scalable compressive Raman parallelization scheme based on single-photon avalanche diode (SPAD) arrays to reach pixel dwell times of 23 $\mu$s, representing over 10$\times$ speed-up using the otherwise weak spontaneous effect.
Randomness is of fundamental importance in various fields, such as cryptography, numerical simulations, or the gaming industry. Quantum physics, which fundamentally probabilistic, best option for a physical random number generator. In this article, we will present work carried out projects context development commercial and certified high speed
The Hanbury Brown-Twiss (HBT) effect holds a pivotal place in intensity interferometry and gave seminal contribution to the development of quantum optics. To observe such an effect, both good spectral timing resolutions are necessary. Most often, HBT is observed for single frequency at time, due limitations dealing with multifrequencies simultaneously, halting limiting some applications. Here, we report fast data-driven spectrometer built one-dimensional array single-photon-sensitive...