A5076541178- Advanced Optical Sensing Technologies
- Random lasers and scattering media
- Optical Coherence Tomography Applications
- Advanced Fluorescence Microscopy Techniques
- Optical Imaging and Spectroscopy Techniques
- Advanced Optical Imaging Technologies
- Image and Video Quality Assessment
- Particle Detector Development and Performance
- Non-Invasive Vital Sign Monitoring
- Thermoregulation and physiological responses
- Visual perception and processing mechanisms
- Photoacoustic and Ultrasonic Imaging
- Radiation Detection and Scintillator Technologies
- Photonic and Optical Devices
- Digital Holography and Microscopy
- Ocular and Laser Science Research
- Neural Networks and Reservoir Computing
- Medical Imaging Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Photonic Communication Systems
- Astrophysics and Cosmic Phenomena
- Acute Ischemic Stroke Management
- Image and Signal Denoising Methods
- Infrared Thermography in Medicine
- Semiconductor Lasers and Optical Devices
École Polytechnique Fédérale de Lausanne
2021-2024
Laboratory for Research on Enterprise and Decisions
2021
Diffuse correlation spectroscopy (DCS) is a promising noninvasive technique for monitoring cerebral blood flow and measuring cortex functional activation tasks. Taking multiple parallel measurements has been shown to increase sensitivity, but not easily scalable with discrete optical detectors. Here we show that large 500 × SPAD array an advanced FPGA design, achieve SNR gain of almost over single-pixel mDCS performance. The system can also be reconfigured sacrifice decrease bin width, 400...
Abstract The correlation properties of light provide an outstanding tool to overcome the limitations traditional imaging techniques. A relevant case is represented by plenoptic (CPI), a quantum-inspired volumetric protocol employing spatio-temporally correlated photons from either entangled or chaotic sources address main conventional light-field imaging, namely, poor spatial resolution and reduced change perspective for 3D imaging. However, application potential high-resolution modalities...
Single-photon avalanche diodes (SPADs) are novel image sensors that record the arrival of individual photons at extremely high temporal resolution. In past, they were only available as single pixels or small-format arrays, for various active imaging applications such LiDAR and microscopy. Recently, high-resolution SPAD arrays up to 3.2 megapixel have been realized, which first time may be able capture sufficient spatial details general computer vision tasks, purely a passive sensor. However,...
To address many of the deficiencies in optical neuroimaging technologies, such as poor tempo-spatial resolution, low penetration depth, contact-based measurement, and time-consuming image reconstruction, a novel, noncontact, portable, time-resolved laser speckle contrast imaging (TR-LSCI) technique has been developed for continuous, fast, high-resolution 2D mapping cerebral blood flow (CBF) at different depths head. TR-LSCI illuminates head with picosecond-pulsed, coherent, widefield...
Quantum ghost imaging uses quantum entanglement to generate a two-dimensional image with only bucket detector at the sample. Here we expand on this approach three-dimensional without scanning. A entangled light source directly links information between pair of 2D sensors; one which captures standard from perspective and second sensor perpendicular perspective. By correlating spatial two detectors for each photon pair, obtain three dimensions (x, y, z) scattered photon. We demonstrate that...
Quantum ghost imaging uses quantum entanglement to generate a two-dimensional image with only bucket detector at the sample. Here we expand on this approach three-dimensional without scanning. A entangled light source directly links information between pair of 2D sensors; one which captures standard from perspective and second sensor perpendicular perspective. By correlating spatial two detectors for each photon pair, obtain three dimensions (x, y, z) scattered photon. We demonstrate that...
Abstract Fluorescence lifetime imaging (FLI) has been receiving increased attention in recent years as a powerful diagnostic technique biological and medical research. However, existing FLI systems often suffer from tradeoff between processing speed, accuracy, robustness. Inspired by the concept of Edge Artificial Intelligence (Edge AI), we propose robust approach that enables fast with no degradation accuracy. This couples recurrent neural network (RNN), which is trained to estimate...
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...
In this article, we report on SwissSPAD3 (SS3), a 500 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times$ </tex-math></inline-formula> pixel single-photon avalanche diode (SPAD) array, fabricated in 0.18- notation="LaTeX">$\mu \text{m}$ CMOS technology. sensor, introduce novel dual-gate architecture with two contiguous temporal windows, or gates, guaranteed by the circuit to be nonoverlapping and...
The Piccolo gated sensor features a 32x32 SPAD array of single-photon avalanche diodes (SPADs) operating in time-correlated counting (TCSPC). chip enables event-driven readout and maximum count rate 220 Mcps. is based on the original architecture, whereas pixel was redesigned to accommodate sub-nanosecond time gating circuitry. As result, pitch increased by 3 μm 31 with slightly lower fill factor 23.7%. time-gating circuitry comprises active recharge activate gate fast switch de-activate...
Abstract Scintillating fibre detectors combine sub-mm resolution particle tracking, precise measurements of the stopping power and sub-ns time resolution. Typically, fibres are read out with silicon photomultipliers (SiPM). Hence, if a few hundred $$\upmu $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>μ</mml:mi> </mml:math> m diameter used, either they grouped together coupled single SiPM, losing spatial resolution, or very large number electronic channels is required....
Quantum ghost imaging approaches have been proposed to enhance biological microscopy, for example, using 2D visible detectors provide IR images or providing additional dimensions of spatial spectral information. Toward the goal making such schemes practical, we compare image quality and depth-of-field between traditional at same excitation levels. We measure how depend on parameters entangled light produced type-I spontaneous parametric down-conversion (SPDC). use a pair time-synchronized,...
Single-photon avalanche diode (SPAD) arrays can be used for single-molecule localization microscopy (SMLM) because of their high frame rate and lack readout noise. SPAD have a binary output, which means photon arrivals should described as binomial process rather than Poissonian process. Consequentially, the theoretical minimum uncertainty localizations is not accurately predicted by Cramér-Rao lower bound (CRLB). Here, we derive CRLB benchmark it using simulated experimental data. We show...
Megapixel single-photon avalanche diode (SPAD) arrays have been developed recently, opening up the possibility of deploying SPADs as generalpurpose passive cameras for photography and computer vision. However, most previous work on has limited to monochrome imaging. We propose a computational technique that reconstructs high-quality color images from mosaicked binary frames captured by SPAD array, even high-dyanamic-range (HDR) scenes with complex rapid motion. Inspired conventional burst...
Quantum ghost imaging can be an important tool in making optical measurements. One of the most useful aspects is unique ability to correlate two sets independently collected information. We aim use principles build out a 3-dimensional microscope which utilizes detection from detectors that simultaneously capture entangled light. Further advancements and application this relatively new method depends on understanding limits system. What quality should we expect? Can image out-of-focus...
The SwissSPAD2/3 camera family is based on quarter megapixel single-photon avalanche diode (SPAD) time gated imagers. 16.38-µm low-noise pixels feature a single-bit memory and built-in all-solid-state nanosecond gating without the need for external image intensifiers. Microlenses have also been made available to increase overall system sensitivity, including high NA applications. are coupled FPGA platforms enabling virtually noiseless streaming at up 100 kpfs. A 1-bit accumulation of frames...
Correlation Plenoptic Imaging (CPI) is a novel technological imaging modality enabling to overcome drawbacks of standard plenoptic devices, while preserving their advantages. However, major challenge in view real-time application CPI related with the relevant amount required frames and consequent computational-intensive processing algorithm. In this work, we describe design implementation an optimized algorithm that portable efficient computational environment exploits highly parallel...
Quantum ghost imaging approaches have been proposed to enhance biological microscopy, for example using 2D visible detectors provide IR images or providing additional dimensions of spatial spectral information. Toward the goal making such schemes practical, we compare image quality and depth-of-field between traditional at same excitation levels. We measure how depend on parameters entangled light produced type-1 spontaneous parametric down-conversion (SPDC). use a pair time-synchronized,...
Quantum ghost imaging approaches have been proposed to enhance biological microscopy, for example using 2D visible detectors provide IR images or providing additional dimensions of spatial spectral information. Toward the goal making such schemes practical, we compare image quality and depth-of-field between traditional at same excitation levels. We measure how depend on parameters entangled light produced type-1 spontaneous parametric down-conversion (SPDC). use a pair time-synchronized,...
We introduce a new generation of 3D imaging devices based on quantum plenoptic imaging. Position-momentum entanglement and photon number correlations are exploited to provide scan-free image after post-processing the collected light intensity signal. explore steps toward designing implementing plenop- tic cameras with dramatically improved performances, unattainable in standard cameras, such as diffraction-limited resolution, large depth focus, ultra-low noise. However, make these types...