A5085243047- Random lasers and scattering media
- Optical Coherence Tomography Applications
- Photoacoustic and Ultrasonic Imaging
- Digital Holography and Microscopy
- Laser-Matter Interactions and Applications
- Advanced Optical Imaging Technologies
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Thermography and Photoacoustic Techniques
- Orbital Angular Momentum in Optics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Fluorescence Microscopy Techniques
- Ultrasound and Hyperthermia Applications
- Neural Networks and Reservoir Computing
- Optical Imaging and Spectroscopy Techniques
- Law, Economics, and Judicial Systems
- Photonic Crystal and Fiber Optics
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Solid State Laser Technologies
- Legal and Constitutional Studies
- Legal principles and applications
- Optical Network Technologies
- Neural dynamics and brain function
- Regulation and Compliance Studies
Hebrew University of Jerusalem
2016-2024
Harvard University Press
2018-2021
Bar-Ilan University
2018-2021
RWTH Aachen University
2021
Laboratoire Kastler Brossel
2014-2020
Weizmann Institute of Science
2008-2020
Institut Langevin
2013-2019
Collège de France
2014-2019
Institut Jean Nicod
2014-2019
Technion – Israel Institute of Technology
2018
We describe an advanced image reconstruction algorithm for pseudothermal ghost imaging, reducing the number of measurements required recovery by order magnitude. The is based on compressed sensing, a technique that enables N-pixel from much less than N measurements. demonstrate using experimental data ghost-imaging setup. can be applied to taken past experiments, improving reconstruction’s quality.
We experimentally demonstrate pseudothermal ghost imaging and diffraction using only a single single-pixel detector. achieve this by replacing the high resolution detector of reference beam with computation propagating field, following recent proposal Shapiro [J. H. Shapiro, arXiv:0807.2614 (2008)]. Since is used, provides an experimental evidence that does not rely on non-local quantum correlations. In addition, we show depth-resolving capability technique.
The recent theory of compressive sensing leverages upon the structure signals to acquire them with much fewer measurements than was previously thought necessary, and certainly well below traditional Nyquist-Shannon sampling rate. However, most implementations developed take advantage this framework revolve around controlling carefully engineered material or acquisition sequences. Instead, we use natural randomness wave propagation through multiply scattering media as an optimal instantaneous...
The last decade has seen the development of a wide set tools, such as wavefront shaping, computational or fundamental methods, that allow to understand and control light propagation in complex medium, biological tissues multimode fibers. A vibrant diverse community is now working on this field, revolutionized prospect diffraction-limited imaging at depth tissues. This roadmap highlights several key aspects fast developing some challenges opportunities ahead.
Diffraction-limited imaging through complex scattering media is a long sought after goal with important applications in biomedical research. In recent years, high resolution wavefront-shaping has emerged as powerful approach to generate sharp focus highly scattering, visually opaque samples. However, it requires localized feedback signal from the target point of interest, which necessitates an invasive procedure all-optical techniques. Here, we show that by exploiting optical nonlinearities,...
We report the broadband characterization of propagation light through a multiple scattering medium by means its multispectral transmission matrix. Using single spatial modulator, our approach enables full control both and spectral properties an ultrashort pulse transmitted medium. demonstrate spatiotemporal focusing at any arbitrary position time with desired shape. Our opens new perspectives for fundamental studies light-matter interaction in disordered media, has potential applications...
This paper investigates experimental means of measuring the transmission matrix (TM) a highly scattering medium, with simplest optical setup. Spatial light modulation is performed by digital micromirror device (DMD), allowing high rates and pixel counts but only binary amplitude modulation. On sensor side, without reference beam, CCD camera provides intensity measurements. Within this framework, shows that TM can still be retrieved, through signal processing techniques phase retrieval....
Flexible fiber-optic endoscopes provide a solution for imaging at depths beyond the reach of conventional microscopes. Current require focusing and/or scanning mechanisms distal end, which limit miniaturization, frame-rate, and field view. Alternative wavefront-shaping based lensless solutions are extremely sensitive to fiber-bending. We present lensless, bend-insensitive, single-shot approach on speckle-correlations in fiber bundles that does not wavefront shaping. Our computationally...
Recently introduced speckle correlations-based techniques enable noninvasive imaging of objects hidden behind scattering layers. In these techniques, the object Fourier amplitude is retrieved from scattered light autocorrelation, and lost phase recovered via iterative phase-retrieval algorithms, which suffer convergence to wrong local minimums solutions cannot solve ambiguities in orientation. Here, inspired by notions used astronomy, we experimentally demonstrate that addition amplitude,...
Dark matter is one of the greatest mysteries in physics. It interacts via gravity and composes most our universe, but its elementary composition unknown. We search for nongravitational interactions axion-like dark with atomic spins using a precision quantum detector. The detector composed spin-polarized xenon gas that can coherently interact background field as it traverses through galactic halo. Conducting 5-month-long search, we report on first results Noble Alkali Spin Detectors...
One of the key insights in emerging field non-Hermitian photonics is that well-established concepts like laser can be operated reverse to realize a 'coherent perfect absorber' (CPA). While conceptually appealing, such CPAs are limited so far single, judiciously shaped wavefront or 'mode'. Here, we demonstrate how this limitation overcome by time-reversing 'degenerate cavity laser', based on unique self-images any incident light-field onto itself. Placing weak, critically-coupled absorber...
Abstract Ultrathin lensless fibre endoscopes offer minimally invasive investigation, but they mostly operate as a rigid type due to the need for prior calibration of probe. Furthermore, most implementations work in fluorescence mode rather than label-free imaging mode, making them unsuitable general medical diagnosis. Herein, we report fully flexible ultrathin endoscope taking 3D holographic images unstained tissues with 0.85-μm spatial resolution. Using bare bundle thin 200-μm diameter,...
In high-frequency photoacoustic imaging with uniform illumination, homogeneous photo-absorbing structures may be invisible because of their large size or limited-view issues. Here we show that, by exploiting dynamic speckle it is possible to reveal features which are normally a system comprised 20MHz linear ultrasound array. We demonstrate 5 mm diameter absorbing cylinder and 30 micrometer black thread arranged in complex shape. The hidden directly retrieved from images recorded for...
In deep tissue photoacoustic imaging, the spatial resolution is inherently limited by acoustic diffraction. Moreover, as ultrasound attenuation increases with frequency, often traded-off for penetration depth. Here we report on super-resolution imaging use of multiple speckle illumination. Specifically, show that analysis second-order fluctuations images combined image deconvolution enables resolving optically absorbing structures beyond diffraction limit. A increase almost a factor 2...
In deep tissue photoacoustic imaging the spatial resolution is inherently limited by acoustic wavelength.We present an approach for surpassing diffraction limit exploiting temporal fluctuations in sample absorption distribution, such as those induced flowing particles.In addition to enhanced resolution, our provides background reduction, and can be implemented with any conventional system.The considerable increase made possible adapting notions from super-resolution optical (SOFI) developed...
Abstract Nonlinear structured illumination microscopy (nSIM) is an effective approach for super-resolution wide-field fluorescence with a theoretically unlimited resolution. In nSIM, carefully designed, highly-contrasted patterns are combined the saturation of optical transition to enable sub-diffraction imaging. While technique proved useful two-dimensional imaging, extending it three-dimensions challenging due fading organic fluorophores under intense cycling conditions. Here, we present...
Optical imaging through turbid samples and fibers is made possible by adaptive correction of scattering guided image quality.
Abstract Fiber-based micro-endoscopes are a critically important tool for minimally-invasive deep-tissue imaging. However, current cannot perform three-dimensional imaging through dynamically-bent fibers without the use of bulky optical elements such as lenses and scanners at distal end, increasing footprint tissue-damage. Great efforts have been invested in developing approaches that avoid elements. fundamental barrier dynamic wavefront-distortions propagation flexible limits to...