A5030408596- Advanced X-ray Imaging Techniques
- Random lasers and scattering media
- Crystallography and Radiation Phenomena
- Photorefractive and Nonlinear Optics
- Laser-Matter Interactions and Applications
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Diamond and Carbon-based Materials Research
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Orbital Angular Momentum in Optics
- Nonlinear Photonic Systems
- Spectroscopy and Quantum Chemical Studies
- Quantum optics and atomic interactions
- Terahertz technology and applications
- Advanced MRI Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- Chalcogenide Semiconductor Thin Films
- Digital Holography and Microscopy
- X-ray Spectroscopy and Fluorescence Analysis
Bar-Ilan University
2015-2024
University of California, Irvine
2020
Texas A&M University
2020
SPring-8
2018-2019
Stanford University
2011-2014
Technion – Israel Institute of Technology
2002-2011
Conventional spectroscopy uses classical light to detect matter properties through the variation of its response with frequencies or time delays.Quantum opens up new avenues for by utilizing parameters quantum state as novel control knobs and photon statistics coupling matter.This Roadmap article focuses on using a powerful sensing spectroscopic tool reveal information about complex molecules that is not accessible light.It aims at bridging optics communities which normally have opposite...
We report clear experimental evidence for second harmonic generation at hard x-ray wavelengths. Using a 1.7 Å pumping beam generated by free electron laser, we observe in diamond. The is of order 10 times the background radiation, scales quadratically with pump pulse energy, and over narrow phase-matching condition. Of importance future experiments, our results indicate that it possible to nonlinear processes crystals intensities exceeding 1016 W/cm2.
We describe an experiment demonstrating ghost imaging with incoherent low brightness X-ray tube source. reconstruct the images of 10 μm and 100 slits very high contrast. Our results advance possibilities that high-resolution method diffraction will be utilized tabletop sources.
We experimentally and theoretically study the coincidence count rate for down-converted x-ray photons. Because of photoionization, parametric down-conversion at wavelengths generally involves loss theoretical description requires a Langevin approach. By working in transmission geometry (Laue) rather than Bragg previous experiments, we obtain an improvement signal-to-noise ratio 12.5, find agreement between experiment theory.
We demonstrate computational ghost imaging at X-ray wavelengths with only one single-pixel detector. show that, by using a known designed mask as diffuser that induces intensity fluctuations in the probe beam, it is possible to compute propagation of electromagnetic field absence investigated object. correlate these calculations measured data when object present order reconstruct images 50 μm and 80 slits. Our results open possibilities for high-resolution partially coherent sources can lead...
We report the observation of nonsequential two-photon absorption from $K$ shell solid Zr (atomic number $Z=40)$ using intense x-ray pulses Spring-8 Angstrom Compact Free-Electron Laser (SACLA). determine generalized nonlinear cross section at threshold in range 3.9--57 $\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}60}\phantom{\rule{4.pt}{0ex}}{\text{cm}}^{4}\phantom{\rule{4.pt}{0ex}}\text{s}$ bounded by estimated uncertainty absolute intensity. The lower limit is consistent with...
We report the experimental observation of ghost imaging with paired x-ray photons, which are generated by parametric downconversion. use one-to-one relation between photon energies and emission angles anticorrelation $k$-vectors signal idler photons to reconstruct images slits nominally zero background levels. Further extension our procedure can be used for various quantum phenomena at wavelengths.
Chemical element mapping is an imaging tool that provides essential information about composite materials, and it crucial for a broad range of fields ranging from fundamental science to numerous applications. Methods exploit x-ray fluorescence are very advantageous widely used, but require focusing the input beam raster scanning sample. Thus, methods slow exhibit limited resolution due challenges. Here, we demonstrate method based on computational ghost overcomes those limitations since does...
We show that polarization entangled photons at x-ray energies can be generated via spontaneous parametric down-conversion. Each of the four Bell states by choosing angle incidence and pumping beam.
We report the observation of parametrically down-converted x-ray signal photons at photon energies that correspond to idler optical wavelengths. The count-rate dependence on angles input beam and detector slit sizes agrees with theory within experimental uncertainties. nonlinear susceptibility, which we calculated from measured efficiencies, is comparable susceptibility evaluated measurements wave mixing. results present Letter advance development a spectroscopy method for probing...
Abstract X-ray imaging is a prevalent technique for non-invasively visualizing the interior of human body and other opaque samples. In most commercial modalities, an image formed by measuring X-rays that pass through object interest. However, despite potential scattered radiation to provide additional information about object, it often disregarded due its inherent tendency cause blurring. Consequently, conventional modalities do not measure or utilize these valuable data. contrast, we...
We present the first experimental demonstration of quantum enhanced detection at x-ray wavelengths. show that pairs are generated by spontaneous down-conversion can be used for generation heralded photons and directly measure sub-Poissonian statistics single using photon number resolving detectors. utilize properties strong time-energy correlations down-converted to demonstrate ability improve visibility signal-to-noise ratio an image with a small in environment noise level is higher than...
We demonstrate experimentally the ability to use a single-pixel detector for two-dimensional high-resolution x-ray imaging of fast dynamics. image rotation spinning chopper at 100 kHz and spatial resolution about 40 microns by using computational ghost approach. The technique we develop can be used dynamics periodic periodically stimulated effects with large field view low dose.
We describe high energy-resolution measurements of parametric down-conversion x-rays into ultraviolet radiation using a standard laboratory x-ray tube source with very minor modifications. measure the effect in diamond and lithium fluoride crystals range from 30 eV to 65 eV. show that depends strongly on fluorine LI edge at 37 K 55 The comparison theory reveals classical model was previously used for description agrees experimental results diamond. However, discrepancies are prominent.
We describe the process of difference-frequency generation short optical pulses from two-color X-ray pulses. By assuming 10¹¹ photons per pulse, we predict that count rate can exceed 10⁷ pulse. Similar to other effects involving nonlinear interactions X-rays and radiation, effect be used for microscopic studies chemical bonds as a probe light-matter on atomic scale. Since damage threshold is much higher than threshold, efficiency two expected orders magnitude such sum/difference-frequency...
We describe an experiment demonstrating the possibility to generate collinear indistinguishable x-ray photon pairs with a highly suppressed background. By choosing angles near 90 degrees between detectors and pump beam, where polarization is in scattering plane, we improve signal-to-noise ratio by 2 orders of magnitude. measure pure coincidence spectrum without any energy discrimination bandwidth 1.5 keV at full width half maximum.
We present measurements of X-ray Parametric Down Conversion at the Advanced Photon Source synchrotron facility. Using an incoming pump beam 22 keV, we observe simultaneous, elastic emission down-converted photon pairs generated in a diamond crystal. The are detected using high count rate silicon drift detectors with low noise. Production by down-conversion is confirmed measuring time-energy correlations detector signal, where within energy window ranging from 10 to 12 keV only observed short...
We demonstrate the formation of (1+1) - and (2+1) -dimensional solitons in photorefractive CdZnTe:V, exploiting intensity-resonant behavior space-charge field. control resonance optically, facilitating a 10-mus soliton times with very low optical power.
An X-ray free-electron laser oscillator (XFELO) is a new type of hard source that would produce fully coherent pulses with meV bandwidth and stable intensity. The XFELO complements existing sources based on self-amplified spontaneous emission (SASE) from high-gain lasers (XFEL) ultra-short broad-band chaotic spectra. This report discussions scientific opportunities enabled by an during workshop held at SLAC June 29 - July 1, 2016
We present the observation of peculiar nonmonotonic photon energy dependencies count rates and rocking curves parametric down-conversion x rays into ultraviolet far from any atomic resonances. The observations cannot be explained by models that consider only or bond charge responses suggest collective phenomena contribute to effect. propose an interpretation includes nonlinear interactions with plasmons, which can explain existence peaks in this range. Our Letter implies between either...
We demonstrate a simple and robust high-resolution ghost spectroscopy approach for x-ray extreme ultraviolet absorption at free-electron laser sources. Our requires an on-line spectrometer before the sample downstream bucket detector. use this method to measure spectrum of silicon, silicon carbide nitride membranes in vicinity L2,3-edge. show that allows reconstruction spectral response using coarse energy scan with self-amplified spontaneous emission radiation. For conditions our experiment...
Hard x-ray imaging is indispensable across diverse fields owing to its high penetrability. However, the resolution of traditional modalities, such as computed tomography (CT) systems, constrained by factors including beam properties, limitations optical components, and detection resolution. As a result, typical in commercial systems that provide full-field limited few hundred microns, scanning CT are too slow for many applications. This study advances high-photon-energy extending concept...
We report on enormous light-induced reversible strain effects in CdZnTe:V crystals, which lead to a remarkable enhancement of their nonlinear properties, such as electrostriction and electro-optic effects. Using both high resolution x-ray diffraction optical interferometry we measure relative deformation the initial crystalline lattice (changes d-spacings) up 0.15%. The experimental findings are attributed breaking cubic symmetry. Our results point family inorganic materials whose properties...