Статті в журналах: "Single-photon sources characterization"

1

Euler, Sabine, Erik Fitzke, Oleg Nikiforov, Daniel Hofmann, Till Dolejsky, and Thomas Walther. "Spectral characterization of SPDC-based single-photon sources for quantum key distribution." European Physical Journal Special Topics 230, no. 4 (April 26, 2021): 1073–80. http://dx.doi.org/10.1140/epjs/s11734-021-00081-5.

Повний текст джерела

Анотація:

AbstractIn our laboratory, we employ two biphoton sources for quantum key distribution. The first is based on cw parametric down-conversion of photons at 404 nm in PPKTP waveguide chips, while the second is based on the pulsed parametric down-conversion of 775 nm photons in PPLN waveguides. The spectral characterization is important for the determination of certain side-channel attacks. A Hong-Ou-Mandel experiment employing the first photon source revealed a complex structure of the common Hong-Ou-Mandel dip. By measuring the spectra of the single photons at 808 nm, we were able to associate these structures to the superposition of different transverse modes of the pump photons in our waveguide chips. The pulsed source was characterized by means of single-photon spectra measured by a sensitive spectrum analyzer as well as dispersion-based measurements. Finally, we also describe Hong-Ou-Mandel experiments using the photons from the second source.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Tavani, Giulio, Giorgia Franzò, Michele Castriotta, Giorgio Ferrari, Francesco Picciariello, Giulio Foletto, Costantino Agnesi, et al. "Fabrication and optical characterization of erbium-doped silicon diode for quantum communication applications." EPJ Web of Conferences 266 (2022): 01012. http://dx.doi.org/10.1051/epjconf/202226601012.

Повний текст джерела

Анотація:

Quantum Key Distribution allows two users to exchange secret keys and it is based on the transmission of single photons or attenuated laser pulses. Recently, sources based on multiple single-photon emitters were demonstrated to be suitable for QKD. Here, we present a CMOS compatible multiple single-photon emitters source realized on a SOI wafer by a standard silicon diode doped with erbium ions. Particular emphasis is placed on the fabrication of such a device enhancing the erbium electroluminescence signal by adopting a proper oxygen co-doping. Finally, electroluminescence characterization at room temperature of the device is presented.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Tatebayashi, J., Y. Ota, D. Karunathillake, S. Ishida, M. Nishioka, S. Iwamoto, and Y. Arakawa. "Formation of a single In(Ga)As/GaAs quantum dot embedded in a site-controlled GaAs nanowire by metalorganic chemical vapor deposition for application to single photon sources." MRS Proceedings 1439 (2012): 115–19. http://dx.doi.org/10.1557/opl.2012.912.

Повний текст джерела

Анотація:

ABSTRACTWe report the formation and optical properties of site-controlled InAs/GaAs quantum dots (QDs) embedded in GaAs nanowires (NWs) by selective metalorganic chemical vapor deposition for application to single photon sources. InAs/GaAs QD-in-NWs with various InAs thicknesses are realized on patterned GaAs(111)B substrates in the form of InAs/GaAs heterostructures and identified by structural analyses using scanning transmission electron microscopy and photoluminescence characterization. Sharp excitonic emission peaks at 10 K from single QD-in-NWs with the narrowest exciton linewidth of 87 μeV are observed. Light emission from the single QD-in-NW shows photon antibunching which evidences single photon emission from high-quality QD-in-NWs.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Siampour, Hamidreza, Ou Wang, Vladimir A. Zenin, Sergejs Boroviks, Petr Siyushev, Yuanqing Yang, Valery A. Davydov, et al. "Ultrabright single-photon emission from germanium-vacancy zero-phonon lines: deterministic emitter-waveguide interfacing at plasmonic hot spots." Nanophotonics 9, no. 4 (April 2, 2020): 953–62. http://dx.doi.org/10.1515/nanoph-2020-0036.

Повний текст джерела

Анотація:

AbstractStriving for nanometer-sized solid-state single-photon sources, we investigate atom-like quantum emitters based on single germanium-vacancy (GeV) centers isolated in crystalline nanodiamonds (NDs). Cryogenic characterization indicated symmetry-protected and bright (>106 counts/s with off-resonance excitation) zero-phonon optical transitions with up to 6-fold enhancement in energy splitting of their ground states as compared to that found for GeV centers in bulk diamonds (i.e. up to 870 GHz in highly strained NDs vs. 150 GHz in bulk). Utilizing lithographic alignment techniques, we demonstrate an integrated nanophotonic platform for deterministic interfacing plasmonic waveguides with isolated GeV centers in NDs, which enables 10-fold enhancement of single-photon decay rates along with the emission direction control by judiciously designing and positioning a Bragg reflector. This approach allows one to realize the unidirectional emission from single-photon dipolar sources, thereby opening new perspectives for the realization of quantum optical integrated circuits.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Ma, Lijun, Oliver Slattery, and Xiao Tang. "Spectral characterization of single photon sources with ultra-high resolution, accuracy and sensitivity." Optics Express 25, no. 23 (November 7, 2017): 28898. http://dx.doi.org/10.1364/oe.25.028898.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Gordon, Reuven. "(Invited) Optical Tweezers to Isolate Single Er Ion Emitter Containing Nanocrystals and in-Situ Perovskite Quantum Dot Analysis." ECS Meeting Abstracts MA2022-01, no. 20 (July 7, 2022): 1084. http://dx.doi.org/10.1149/ma2022-01201084mtgabs.

Повний текст джерела

Анотація:

We have used optical tweezers with shaped apertures in metal films to hold onto individual nanoparticles including erbium containing nanoparticles and perovskite quantum dots. In this talk, I will talk about our ability to isolate nanocrystals with just one erbium emitter, paving the way for single photon sources at low loss fiber wavelengths. I will also talk about our new work on in-situ characterization and assembly of perovskite quantum dots, allowing to relate size to emission wavelength and look at quantum hybridization.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Ha, Seung-Kyu, Jin Dong Song, Su Youn Kim, Jung Il Lee, Samir Bounouar, Le Si Dang, and Jong Su Kim. "Optical Characterization of the Excitonic States in Low-density Droplet GaAs Quantum Dots for Single Photon Sources." Journal of the Korean Physical Society 58, no. 5(1) (May 13, 2011): 1330–33. http://dx.doi.org/10.3938/jkps.58.1330.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Li, Zhen, Keigo Otsuka, Daiki Yamashita, Daichi Kozawa, and Yuichiro K. Kato. "(Invited) Quantum Emission Assisted By Energy Landscape Modification in Pentacene-Decorated Carbon Nanotubes." ECS Meeting Abstracts MA2022-01, no. 9 (July 7, 2022): 737. http://dx.doi.org/10.1149/ma2022-019737mtgabs.

Повний текст джерела

Анотація:

Photoluminescent carbon nanotubes are expected to become versatile room-temperature single-photon sources that have applications in quantum information processing. Quantum emission from carbon nanotubes is often induced by localization of excitons or exciton-exciton annihilation. Here, we modify the local energy landscape of excitons by decorating nanoscale pentacene particles onto air-suspended single-walled carbon nanotubes [1]. Directional exciton diffusion from the undecorated region to the decorated site is demonstrated, suggesting exciton trapping induced by local dielectric screening from pentacene particles. Photoluminescence and photon correlation measurements on a representative carbon nanotube reveal enhanced exciton-exciton annihilation and single-photon emission at room temperature. Pentacene particles are shown to promote strong photon antibunching at the decorated site, indicating that noncovalent functionalization using molecules can be an effective approach for energy landscape modification and quantum emission in carbon nanotubes. Work supported in part by MIC (SCOPE 191503001), JSPS (KAKENHI JP20H02558, JP19J00894, JP20J00817, JP20K15121, JP20K15137, JP20K15112 and JP20K15199), and MEXT (Nanotechnology Platform JPMXP09F19UT0079). K.O. and D.Y. are supported by the JSPS Research Fellowship. D.K. is supported by the RIKEN Special Postdoctoral Researcher Program. We acknowledge RIKEN Materials Characterization Team for access to the transmission electron microscope, and RIKEN Advanced Manufacturing Support Team for technical assistance. [1] Z. Li, K. Otsuka, D. Yamashita, D. Kozawa, Y. K. Kato, ACS Photonics 8, 2367 (2021).

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Angeloni, L. A., I. J. Shan, and W. Andreas Schroeder. "Sub-threshold ultrafast one-photon photoemission from a Cu(111) photocathode." AIP Advances 12, no. 10 (October 1, 2022): 105129. http://dx.doi.org/10.1063/5.0099779.

Повний текст джерела

Анотація:

Single-photon photoemission of electrons for incident photon energies below the surface work function is reported for a single-crystal Cu(111) photocathode. Spectral characterization of the quantum efficiency and mean transverse energy of the emitted electrons is shown to be consistent with emission from a thermalized hot electron distribution photoexcited on sub-picosecond time scales into an upper conduction band at the L-point of the Brillouin zone of copper. To our knowledge, this is the first time that such excited-state thermionic emission has been observed from a planar metal photocathode, and then from a commonly used photocathode material. The results, therefore, indicate the potential importance of such band structure dependent sub-threshold photoemission mechanisms on the performance of photocathodes employed for the generation of short electron pulses using sub-picosecond laser pulses. Consequently, the combined experimental and theoretical work presented in this paper contributes to solid-state photocathode-based research aimed at our understanding and selection (or discovery) of high brightness photo-electron sources required for many electron-based diffraction, imaging, and accelerator applications.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Durbin, Stephen M. "Proposal for entangled x-ray beams." Journal of Applied Physics 131, no. 22 (June 14, 2022): 224401. http://dx.doi.org/10.1063/5.0091947.

Повний текст джерела

Анотація:

A promising approach for direct detection of quantum entanglement in solid state materials is probing with entangled particles. X-rays are ideal for characterization of many materials but have not been generated as entangled pairs in useful numbers, even at the most powerful synchrotron sources. This proposal describes how x-rays in fully entangled N00N states (with N = 2) can be produced by applying Hong-Ou-Mandel interferometry at an x-ray synchrotron source. The technical requirements for indistinguishable photons, x-ray beamsplitters, and interferometer design are met with existing resources. The entangled x-ray biphotons can be filtered from the unavoidable single photon background by simple diffraction from an analyzer crystal, resulting in intense beams suitable for characterizing quantum materials.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Siewert, F., J. Buchheim, T. Zeschke, M. Störmer, G. Falkenberg, and R. Sankari. "On the characterization of ultra-precise X-ray optical components: advances and challenges inex situmetrology." Journal of Synchrotron Radiation 21, no. 5 (August 27, 2014): 968–75. http://dx.doi.org/10.1107/s1600577514016221.

Повний текст джерела

Анотація:

To fully exploit the ultimate source properties of the next-generation light sources, such as free-electron lasers (FELs) and diffraction-limited storage rings (DLSRs), the quality requirements for gratings and reflective synchrotron optics, especially mirrors, have significantly increased. These coherence-preserving optical components for high-brightness sources will feature nanoscopic shape accuracies over macroscopic length scales up to 1000 mm. To enable high efficiency in terms of photon flux, such optics will be coated with application-tailored single or multilayer coatings. Advanced thin-film fabrication of today enables the synthesis of layers on the sub-nanometre precision level over a deposition length of up to 1500 mm. Specifically dedicated metrology instrumentation of comparable accuracy has been developed to characterize such optical elements. Second-generation slope-measuring profilers like the nanometre optical component measuring machine (NOM) at the BESSY-II Optics laboratory allow the inspection of up to 1500 mm-long reflective optical components with an accuracy better than 50 nrad r.m.s. Besides measuring the shape on top of the coated mirror, it is of particular interest to characterize the internal material properties of the mirror coating, which is the domain of X-rays. Layer thickness, density and interface roughness of single and multilayer coatings are investigated by means of X-ray reflectometry. In this publication recent achievements in the field of slope measuring metrology are shown and the characterization of different types of mirror coating demonstrated. Furthermore, upcoming challenges to the inspection of ultra-precise optical components designed to be used in future FEL and DLSR beamlines are discussed.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Geremew, Temesgen, and Tizazu Abza. "Microstructural and Optical Characterization of Heterostructures of ZnS/CdS and CdS/ZnS Synthesized by Chemical Bath Deposition Method." Advances in Materials Science and Engineering 2020 (November 20, 2020): 1–11. http://dx.doi.org/10.1155/2020/1401689.

Повний текст джерела

Анотація:

ZnS/glass and CdS/glass single layers and ZnS/CdS and CdS/ZnS heterojunction thin films were deposited by the chemical bath deposition method using zinc acetate and cadmium acetate as the metal ion sources and thioacetamide as a nonmetallic ion source in acidic medium. Na2EDTA was used as a complexing agent to control the free cation concentration. The single layer and heterojunction thin films were characterized with X-ray diffraction (XRD), a scanning electron microscope (SEM), energy dispersive X-ray (EDX), and a UV-VIS spectrometer. The XRD patterns of the CdS/glass thin film deposited on the soda lime glass substrate crystalized in the cubic structure with a single peak along the (111) plane. The ZnS/CdS heterojunction and ZnS/glass single layer thin films were crystalized in the hexagonal ZnS structure. The CdS/ZnS heterojunction thin film is nearly amorphous. The optical analysis results confirmed single band gap values of 2.75 eV and 2.5 eV for ZnS/CdS and CdS/ZnS heterojunction thin films, respectively. The CdS/glass and CdS/ZnS thin films have more imaginary dielectric components than the real part. The optical conductivity of the single layer and heterojunction films is in the order of 10 15 1/s. The optical study also confirmed refractive index values between 2 and 2.7 for ZnS/glass, ZnS/CdS, and CdS/ZnS thin films for incident photon energies between 1.2 eV and 3.8 eV. The surface morphology studies revealed compacted spherical grains covering the substrate surfaces with few cracks on ZnS/glass, ZnS/CdS, and CdS/glass and voids on CdS/ZnS thin films. The EDX result confirmed nearly 1 : 1 metallic to nonmetallic ion ratio in the single-layered thin films and the dominance of Zn ion over Cd ion in both ZnS/CdS and CdS/ZnS heterojunction thin films.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Zehbe, Rolf, Astrid Haibel, Heinrich Riesemeier, Ulrich Gross, C. James Kirkpatrick, Helmut Schubert, and Christoph Brochhausen. "Going beyond histology. Synchrotron micro-computed tomography as a methodology for biological tissue characterization: from tissue morphology to individual cells." Journal of The Royal Society Interface 7, no. 42 (March 25, 2009): 49–59. http://dx.doi.org/10.1098/rsif.2008.0539.

Повний текст джерела

Анотація:

Current light microscopic methods such as serial sectioning, confocal microscopy or multiphoton microscopy are severely limited in their ability to analyse rather opaque biological structures in three dimensions, while electron optical methods offer either a good three-dimensional topographic visualization (scanning electron microscopy) or high-resolution imaging of very thin samples (transmission electron microscopy). However, sample preparation commonly results in a significant alteration and the destruction of the three-dimensional integrity of the specimen. Depending on the selected photon energy, the interaction between X-rays and biological matter provides semi-transparency of the specimen, allowing penetration of even large specimens. Based on the projection-slice theorem, angular projections can be used for tomographic imaging. This method is well developed in medical and materials science for structure sizes down to several micrometres and is considered as being non-destructive. Achieving a spatial and structural resolution that is sufficient for the imaging of cells inside biological tissues is difficult due to several experimental conditions. A major problem that cannot be resolved with conventional X-ray sources are the low differences in density and absorption contrast of cells and the surrounding tissue. Therefore, X-ray monochromatization coupled with a sufficiently high photon flux and coherent beam properties are key requirements and currently only possible with synchrotron-produced X-rays. In this study, we report on the three-dimensional morphological characterization of articular cartilage using synchrotron-generated X-rays demonstrating the spatial distribution of single cells inside the tissue and their quantification, while comparing our findings to conventional histological techniques.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Gadkari, D., K. S. Shanks, H. Hu, H. T. Philipp, M. W. Tate, J. Thom-Levy, and S. M. Gruner. "Characterization of 128 × 128 MM-PAD-2.1 ASIC: a fast framing hard x-ray detector with high dynamic range." Journal of Instrumentation 17, no. 03 (March 1, 2022): P03003. http://dx.doi.org/10.1088/1748-0221/17/03/p03003.

Повний текст джерела

Анотація:

Abstract We characterize a new x-ray Mixed-Mode Pixel Array Detector (MM-PAD-2.1) Application Specific Integrated Circuit (ASIC). Using an integrating pixel front-end with dynamic charge removal architecture, the MM-PAD-2.1 ASIC extends the maximum measurable x-ray signal (in 20 keV photon units) to > 107 x-rays/pixel/frame while maintaining a low read noise across the full dynamic range, all while imaging continuously at a frame rate of up to 10 kHz. The in-pixel dynamic charge removal mechanism prevents saturation of the input amplifier and proceeds in parallel with signal integration to achieve deadtime-less measurements with incident x-ray rates of > 1010 x-rays/pixel/s. The ASIC format consists of 128 × 128 square pixels each 150 μm on a side and is designed to be 3-side buttable so large arrays can be effectively tiled. Here we use both laboratory x-ray sources and the Cornell High Energy Synchrotron Source (CHESS) to characterize two single ASIC prototype detectors for both low (single x-ray) and high incident flux detection. In the first detector the ASIC was solder bump-bonded to a 500 μm thick Si sensor for efficient detection of x-rays below 20 keV, whereas the second detector used a 750 μm thick CdTe sensor for x-rays above ∼ 20 keV.

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Borbély, Andras, Loïc Renversade, and Peter Kenesei. "On the calibration of high-energy X-ray diffraction setups. II. Assessing the rotation axis and residual strains." Journal of Applied Crystallography 47, no. 5 (September 4, 2014): 1585–95. http://dx.doi.org/10.1107/s1600576714014290.

Повний текст джерела

Анотація:

The calibration of high-energy X-ray diffraction setups using an area detector and a rotation axis is discussed. The characterization of the tilt and spatial distortions of an area detector was discussed in part one of this series [Borbély, Renversade, Kenesei & Wright (2014).J. Appl. Cryst.47, 1042–1053]. Part II links the detector frame to the laboratory frame comprising an additional rotation axis and introduces a general diffractometer equation accounting for all sources of misalignment. Additionally, an independent high-accuracy method for the evaluation of the crystallographic orientation and cell parameters of the undeformed reference crystal is presented. Setup misalignments are mainly described in terms of a residual strain tensor, considered as a quality label of the diffractometer. The method is exemplified using data sets acquired at beamlines ID11 (European Synchrotron Radiation Facility) and 1-ID (Advanced Photon Source) on Al and W single crystals, respectively. The results show that the residual strain tensor is mainly determined by the detector spatial distortion, and values as small as 1–2 × 10−4can be practically achieved.

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Jungmann-Smith, J. H., A. Bergamaschi, M. Brückner, S. Cartier, R. Dinapoli, D. Greiffenberg, T. Huthwelker, et al. "Towards hybrid pixel detectors for energy-dispersive or soft X-ray photon science." Journal of Synchrotron Radiation 23, no. 2 (February 10, 2016): 385–94. http://dx.doi.org/10.1107/s1600577515023541.

Повний текст джерела

Анотація:

JUNGFRAU (adJUstiNg Gain detector FoR the Aramis User station) is a two-dimensional hybrid pixel detector for photon science applications at free-electron lasers and synchrotron light sources. The JUNGFRAU 0.4 prototype presented here is specifically geared towards low-noise performance and hence soft X-ray detection. The design, geometry and readout architecture of JUNGFRAU 0.4 correspond to those of other JUNGFRAU pixel detectors, which are charge-integrating detectors with 75 µm × 75 µm pixels. Main characteristics of JUNGFRAU 0.4 are its fixed gain and r.m.s. noise of as low as 27 e−electronic noise charge (<100 eV) with no active cooling. The 48 × 48 pixels JUNGFRAU 0.4 prototype can be combined with a charge-sharing suppression mask directly placed on the sensor, which keeps photons from hitting the charge-sharing regions of the pixels. The mask consists of a 150 µm tungsten sheet, in which 28 µm-diameter holes are laser-drilled. The mask is aligned with the pixels. The noise and gain characterization, and single-photon detection as low as 1.2 keV are shown. The performance of JUNGFRAU 0.4 without the mask and also in the charge-sharing suppression configuration (with the mask, with a `software mask' or a `cluster finding' algorithm) is tested, compared and evaluated, in particular with respect to the removal of the charge-sharing contribution in the spectra, the detection efficiency and the photon rate capability. Energy-dispersive and imaging experiments with fluorescence X-ray irradiation from an X-ray tube and a synchrotron light source are successfully demonstrated with an r.m.s. energy resolution of 20% (no mask) and 14% (with the mask) at 1.2 keV and of 5% at 13.3 keV. The performance evaluation of the JUNGFRAU 0.4 prototype suggests that this detection system could be the starting point for a future detector development effort for either applications in the soft X-ray energy regime or for an energy-dispersive detection system.

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Rashid, Muhammad Haroon, Ants Koel, Toomas Rang, Nadeem Nasir, Nadeem Sabir, Faheem Ameen, and Abher Rasheed. "Optical Dynamics of Copper-Doped Cadmium Sulfide (CdS) and Zinc Sulfide (ZnS) Quantum-Dots Core/Shell Nanocrystals." Nanomaterials 12, no. 13 (July 1, 2022): 2277. http://dx.doi.org/10.3390/nano12132277.

Повний текст джерела

Анотація:

Recently, quantum-dot-based core/shell structures have gained significance due to their optical, optoelectronic, and magnetic attributes. Controlling the fluorescence lifetime of QDs shells is imperative for various applications, including light-emitting diodes and single-photon sources. In this work, novel Cu-doped CdS/ZnS shell structures were developed to enhance the photoluminescence properties. The objective was to materialize the Cu-doped CdS/ZnS shells by the adaptation of a two-stage high-temperature doping technique. The developed nanostructures were examined with relevant characterization techniques such as transmission electron microscopy (TEM) and ultraviolet–visible (UV–vis) emission/absorption spectroscopy. Studying fluorescence, we witnessed a sharp emission peak at a wavelength of 440 nm and another emission peak at a wavelength of 620 nm, related to the fabricated Cu-doped CdS/ZnS core/shell QDs. Our experimental results revealed that Cu-doped ZnS shells adopted the crystal structure of CdS due to its larger bandgap. Consequently, this minimized lattice mismatch and offered better passivation to any surface defects, resulting in increased photoluminescence. Our developed core/shells are highly appropriate for the development of efficient light-emitting diodes.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Acerbi, Fabio, Giovanni Paternoster, Massimo Capasso, Marco Marcante, Alberto Mazzi, Veronica Regazzoni, Nicola Zorzi, and Alberto Gola. "Silicon Photomultipliers: Technology Optimizations for Ultraviolet, Visible and Near-Infrared Range." Instruments 3, no. 1 (February 12, 2019): 15. http://dx.doi.org/10.3390/instruments3010015.

Повний текст джерела

Анотація:

Silicon photomultipliers (SiPMs) are single-photon sensitive solid-state detectors that are becoming popular for several applications, thanks to massive performance improvements over the last years. Starting as a replacement for the photomultiplier tube (PMT), they are now used in medical applications, big high-energy physics experiments, nuclear physics experiments, spectroscopy, biology and light detection and ranging (LIDAR) applications. Due to different requirements in terms of detection efficiency, noise, etc., several optimizations have been introduced by the manufacturers; for example, spectral sensitivity has been optimized for visible light, near ultraviolet, vacuum ultraviolet, and near infrared light. Each one of them require specific processes and structural optimization. We present in this paper recent improvements in SiPM performance, owing to a higher cell fill-factor, lower noise, improved silicon materials, and deep trench isolation. We describe issues related to the characterization of analog SiPM, particularly due to the different sources of correlated noise, which have to be distinguished from each other and from the primary pulses. We also describe particular analyses and optimizations conducted for specific applications like the readout of liquid noble gas scintillators, requiring these detectors to operate at cryogenic temperatures.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Hadfield, Robert H., Martin J. Stevens, Steven S. Gruber, Aaron J. Miller, Robert E. Schwall, Richard P. Mirin, and Sae Woo Nam. "Single photon source characterization with a superconducting single photon detector." Optics Express 13, no. 26 (2005): 10846. http://dx.doi.org/10.1364/opex.13.010846.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Alléaume, R., F. Treussart, J.-M. Courty, and J.-F. Roch. "Photon statistics characterization of a single-photon source." New Journal of Physics 6 (July 30, 2004): 85. http://dx.doi.org/10.1088/1367-2630/6/1/085.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Hadfield, Robert H., Martin J. Stevens, Richard P. Mirin, and Sae Woo Nam. "Single-photon source characterization with twin infrared-sensitive superconducting single-photon detectors." Journal of Applied Physics 101, no. 10 (May 15, 2007): 103104. http://dx.doi.org/10.1063/1.2717582.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Huang, Tao, Xiaobo Wang, Junhu Shao, Xujin Guo, Liantuan Xiao, and Suotang Jia. "Single event photon statistics characterization of a single photon source in an imperfect detection system." Journal of Luminescence 124, no. 2 (June 2007): 286–90. http://dx.doi.org/10.1016/j.jlumin.2006.03.014.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

23

McDonald, A. D., M. Febbraro, J. Asaadi, and C. C. Havener. "Development of a pulsed vacuum ultraviolet light source with adjustable intensity." Review of Scientific Instruments 93, no. 5 (May 1, 2022): 053103. http://dx.doi.org/10.1063/5.0081175.

Повний текст джерела

Анотація:

This paper describes the development of a pulsed light source using the discharge from an electrode in a medium of various noble gases. This source can be used to aid in the characterization and testing of new vacuum-ultraviolet sensitive light detection devices. The source includes a novel spark driver circuit, a spark chamber into which different noble gases can be introduced, and an optical attenuation cell capable of being filled with different gases to allow for the attenuation of the pulsed light down to single photon levels. We describe the construction, calibration, and characterization of this device deployed at a dedicated light detection test stand at Oak Ridge National Laboratory.

Стилі APA, Harvard, Vancouver, ISO та ін.

24

WU, Qing-Hao, Lei HUA, Ke-Yong HOU, Hua-Peng CUI, Ping CHEN, Wu-Duo ZHAO, Wei-Guo WANG, Jing-Hua LI, and Hai-Yang LI. "Characterization and Applications of Combined Single Photon Ionization and Photoelectron Ionization Source." CHINESE JOURNAL OF ANALYTICAL CHEMISTRY (CHINESE VERSION) 39, no. 10 (July 18, 2012): 1465–69. http://dx.doi.org/10.3724/sp.j.1096.2011.01465.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Georgieva, Hristina, Marco López, Helmuth Hofer, Justus Christinck, Beatrice Rodiek, Peter Schnauber, Arsenty Kaganskiy, et al. "Radiometric characterization of a triggered narrow-bandwidth single-photon source and its use for the calibration of silicon single-photon avalanche detectors." Metrologia 57, no. 5 (September 7, 2020): 055001. http://dx.doi.org/10.1088/1681-7575/ab9db6.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

MARZI, S., A. GIULIETTI, D. GIULIETTI, L. A. GIZZI, and A. SALVETTI. "High brightness laser–plasma X-ray source at IFAM: Characterization and applications." Laser and Particle Beams 18, no. 1 (January 2000): 109–18. http://dx.doi.org/10.1017/s0263034600181133.

Повний текст джерела

Анотація:

A high brightness laser-plasma X-ray source has been set-up and is presently available at IFAM. A wide range of diagnostics has been set up to monitor the properties of the X-ray radiation and to control the main parameters including photon energy, flux intensity, and pulse duration. A beam extractor enables access to the X-ray radiation at atmospheric pressure. A simple, easy-to-use projection microscope has been built which is capable of single-shot micron resolution imaging with digital acquisition. Preliminary biomedical experiments show that the X-ray doses available on a single laser shot exposure of our source fully meet the conditions required for an important class of biological experiments based on X-ray induced DNA damage providing an ideal alternative to the long time exposures needed with X-ray tubes.

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Silva, Nuno A., and Armando N. Pinto. "Comprehensive characterization of a heralded single photon source based on four-wave mixing in optical fibers." Optics Communications 327 (September 2014): 31–38. http://dx.doi.org/10.1016/j.optcom.2014.02.002.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Lin, Bi-Hsuan, Yu-Hao Wu, Xiao-Yun Li, Hsu-Cheng Hsu, Yu-Cheng Chiu, Chien-Yu Lee, Bo-Yi Chen, et al. "Capabilities of time-resolved X-ray excited optical luminescence of the Taiwan Photon Source 23A X-ray nanoprobe beamline." Journal of Synchrotron Radiation 27, no. 1 (January 1, 2020): 217–21. http://dx.doi.org/10.1107/s1600577519013675.

Повний текст джерела

Анотація:

Time-resolved X-ray excited optical luminescence (TR-XEOL) was developed successfully for the 23A X-ray nanoprobe beamline located at the Taiwan Photon Source (TPS). The advantages of the TR-XEOL facility include (i) a nano-focused X-ray beam (<60 nm) with excellent spatial resolution and (ii) a streak camera that can simultaneously record the XEOL spectrum and decay time. Three time spans, including normal (30 ps to 2 ns), hybrid (30 ps to 310 ns) and single (30 ps to 1.72 µs) bunch modes, are available at the TPS, which can fulfil different experimental conditions involving samples with various lifetimes. It is anticipated that TR-XEOL at the TPS X-ray nanoprobe could provide great characterization capabilities for investigating the dynamics of photonic materials.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Stoupin, Stanislav, Thomas Krawczyk, David Sagan, Alexander Temnykh, Louisa Smieska, Arthur Woll, Jacob Ruff, et al. "Side-bounce beamlines using single-reflection diamond monochromators at Cornell High Energy Synchrotron Source." Journal of Synchrotron Radiation 28, no. 2 (February 25, 2021): 429–38. http://dx.doi.org/10.1107/s160057752100120x.

Повний текст джерела

Анотація:

The design and implementation of new beamlines featuring side-bounce (single-reflection) diamond monochromators at Cornell High Energy Synchrotron Source (CHESS) are described. Undulator radiation is monochromated using an interchangeable set of diamond crystal plates reflecting radiation in the horizontal (synchrotron) plane, where each crystal plate is set to one of the low-index Bragg reflections (111, 220, 311 and 400) in either Bragg or Laue reflection geometries. At the nominal Bragg angle of 18° these reflections deliver monochromated X-rays with photon energies of 9.7, 15.9, 18.65 and 22.5 keV, respectively. An X-ray mirror downstream of the diamond monochromator is used for rejection of higher radiation harmonics and for initial focusing of the monochromated beam. The characteristics of the X-ray beam entering the experimental station were measured experimentally and compared with the results of simulations. A reasonable agreement is demonstrated. It is shown that the use of selected high-dislocation-density `mosaic' diamond single-crystal plates produced using the chemical vapor deposition method yields a few-fold enhancement in the flux density of the monochromated beam in comparison with that delivered by perfect crystals under the same conditions. At present, the Functional Materials Beamline at CHESS, which is used for time-resolved in situ characterization of soft materials during processing, has been outfitted with the described setup.

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Shaik, Akbar Basha Dhu-al-jalali-wal-ikram, and Penchalaiah Palla. "Optical quantum technologies with hexagonal boron nitride single photon sources." Scientific Reports 11, no. 1 (June 10, 2021). http://dx.doi.org/10.1038/s41598-021-90804-4.

Повний текст джерела

Анотація:

AbstractSingle photon quantum emitters are important building blocks of optical quantum technologies. Hexagonal boron nitride (hBN), an atomically thin wide band gap two dimensional material, hosts robust, optically active luminescent point defects, which are known to reduce phonon lifetimes, promises as a stable single-photon source at room temperature. In this Review, we present the recent advances in hBN quantum light emission, comparisons with other 2D material based quantum sources and analyze the performance of hBN quantum emitters. We also discuss state-of-the-art stable single photon emitter’s fabrication in UV, visible and near IR regions, their activation, characterization techniques, photostability towards a wide range of operating temperatures and harsh environments, Density-functional theory predictions of possible hBN defect structures for single photon emission in UV to IR regions and applications of single photon sources in quantum communication and quantum photonic circuits with associated potential obstacles.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Binder, T. M., V. Anagnostatou, G. Dedes, K. Kamada, H. G. Kang, G. Lovatti, M. Nitta, et al. "Component characterization and commissioning of a gamma-PET prototype detector system." Frontiers in Physics 10 (September 26, 2022). http://dx.doi.org/10.3389/fphy.2022.954204.

Повний текст джерела

Анотація:

Hybrid imaging systems, comprising PET and Compton camera modules, have recently gained in interest, due to their capability to simultaneously detect positron annihilation photons and γ-rays from single-photon emitting sources as also used in SPECT. A unique feature of such systems, however, is the capability to also be operated in a so called γ-PET mode. Here, specific β+- emitting radioisotopes (such as 44Sc, 1°C or 14O) are used to detect triple-coincidences between two annihilation γ-rays (in PET imaging) and a third, prompt photon (in Compton imaging), that is emitted by the deexcitation of the decay’s daughter nucleus. Consequently, an intersection between the line-of-response (LOR) and the Compton cone can be determined, which (in principle) allows to localize the photons’ emission vertices on a single decay basis. In practice, however, a few tens of events are required to localize a point source, which still results in a considerable sensitivity improvement compared to conventional PET imaging.For a proof-of-principle study, we used a pixelated GAGG crystal array (16 × 16 crystals; 1.45 × 1.45 × 6 mm3 crystal volume; 25 μm SPAD SiPMs as readout) as Compton camera scatterer and PET detectors, and a three-layered LYSO crystal array (1.2 × 1.2 × 6.66 mm3 crystal volume; 50 μm SPAD SiPMs as readout) as Compton camera absorber. We characterized the individual detector components with regard to their energy resolution and the capability to identify the various scintillator array’s individual crystals. Our first γ-PET prototype was tested in PET-only and Compton-only imaging mode, in which spatial resolutions of 3.2–3.5 mm FWHM (PET-only mode) and 14.4–19.3 mm FWHM (Compton-only mode at 1,274 keV) were achieved, respectively, using a22Na point source and 10 iterations of an ML-EM reconstruction algorithm. By using triple-coincidences in a γ-PET mode (event-wise intersection of the LOR and the Compton cone), we could demonstrate the capability of the prototype to perform a full 3D point source reconstruction using only 77 events.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Geßwein, Holger, Pirmin Stüble, Daniel Weber, Joachim R. Binder, and Reiner Mönig. "A multipurpose laboratory diffractometer for operando powder X-ray diffraction investigations of energy materials." Journal of Applied Crystallography 55, no. 3 (May 16, 2022). http://dx.doi.org/10.1107/s1600576722003089.

Повний текст джерела

Анотація:

Laboratory X-ray diffractometers are among the most widespread instruments in research laboratories around the world and are commercially available in different configurations and setups from various manufacturers. Advances in detector technology and X-ray sources push the data quality of in-house diffractometers and enable the collection of time-resolved scattering data during operando experiments. Here, the design and installation of a custom-built multipurpose laboratory diffractometer for the crystallographic characterization of battery materials are reported. The instrument is based on a Huber six-circle diffractometer equipped with a molybdenum microfocus rotating anode with 2D collimated parallel-beam X-ray optics and an optional two-bounce crystal monochromator. Scattered X-rays are detected with a hybrid single-photon-counting area detector (PILATUS 300K-W). An overview of the different diffraction setups together with the main features of the beam characteristics is given. Example case studies illustrate the flexibility of the research instrument for time-resolved operando powder X-ray diffraction experiments as well as the possibility to collect higher-resolution data suitable for diffraction line-profile analysis.

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Hassan, Mostafa Afifi, Min-Woo Kim, Muhammad Ali Johar, Aadil Waseem, Min-Ki Kwon, and Sang-Wan Ryu. "Transferred monolayer MoS2 onto GaN for heterostructure photoanode: Toward stable and efficient photoelectrochemical water splitting." Scientific Reports 9, no. 1 (December 2019). http://dx.doi.org/10.1038/s41598-019-56807-y.

Повний текст джерела

Анотація:

AbstractSolar-driven photoelectrochemical water splitting (PEC-WS) using semiconductor photoelectrodes is considered a promising solution for sustainable, renewable, clean, safe and alternative energy sources such as hydrogen. Here, we report the synthesis and characterization of a novel heterostructure MoS2/GaN to be used as a photoanode for PEC-WS. The heterostructure was synthesized by metal-organic chemical vapor deposition of single crystalline GaN onto a c-plane sapphire substrate, followed by the deposition of a visible light responding MoS2 monolayer (Eg = 1.9 eV) formed by a Mo-sulfurization technique. Our experimental results reveal that MoS2/GaN photoanode achieved efficient light harvesting with photocurrent density of 5.2 mA cm−2 at 0 V vs Ag/AgCl, which is 2.6 times higher than pristine GaN. Interestingly, MoS2/GaN exhibited a significantly enhanced applied-bias-photon-to-current conversion efficiency of 0.91%, whereas reference GaN yielded an efficiency of 0.32%. The superior PEC performance of the MoS2/GaN photoelectrode is mainly related to the enhanced light absorption due to excellent photocatalytic behavior of MoS2, which reduces charge transfer resistance between the semiconductor and electrolyte interface, and the improvement of charge separation and transport. This result gives a new perspective on the importance of MoS2 as a cocatalyst coated onto GaN to synthesize photoelectrodes for efficient solar energy conversion devices.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Zhang, ShengLi, XuBo Zou, ChuanFeng Li, ChenHui Jin, and GuangCan Guo. "Characterization of photon statistics in a single-photon source via variable attenuation." Physical Review A 80, no. 4 (October 8, 2009). http://dx.doi.org/10.1103/physreva.80.043807.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Mizutani, Akihiro, Toshihiko Sasaki, Yuki Takeuchi, Kiyoshi Tamaki, and Masato Koashi. "Quantum key distribution with simply characterized light sources." npj Quantum Information 5, no. 1 (October 11, 2019). http://dx.doi.org/10.1038/s41534-019-0194-3.

Повний текст джерела

Анотація:

Abstract To guarantee the security of quantum key distribution (QKD), security proofs of QKD protocols have assumptions on the devices. Commonly used assumptions are, for example, each random bit information chosen by a sender to be precisely encoded on an optical emitted pulse and the photon-number probability distribution of the pulse to be exactly known. These typical assumptions imposed on light sources such as the above two are rather strong and would be hard to verify in practical QKD systems. The goal of the paper is to replace those strong assumptions on the light sources with weaker ones. In this paper, we adopt the differential-phase-shift (DPS) QKD protocol and drastically mitigate the requirements on light sources, while for the measurement unit, trusted and photon-number-resolving detectors are assumed. Specifically, we only assume the independence among emitted pulses, the independence of the vacuum emission probability from a chosen bit, and upper bounds on the tail distribution function of the total photon number in a single block of pulses for single, two and three photons. Remarkably, no other detailed characterizations, such as the amount of phase modulation, are required. Our security proof significantly relaxes demands for light sources, which paves a route to guarantee implementation security with simple verification of the devices.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Porcari, A., L. Pagura, M. Canepa, E. Biagini, F. Cappelli, G. Tini, F. Dore, et al. "Prognostic implications of biventricular uptake of bone tracers at planar scintigraphy in transthyretin cardiac amyloidosis." European Heart Journal 43, Supplement_2 (October 1, 2022). http://dx.doi.org/10.1093/eurheartj/ehac544.1770.

Повний текст джерела

Анотація:

Abstract Background The prognostic role of bone tracer uptake in transthyretin cardiac amyloidosis (ATTR-CA) is controversial. A further characterization of cardiac retention measured by Perugini scale with differentiation between biventricular (BiV) and isolated left ventricle (LV) uptake has never been attempted previously. Purpose The study investigated the potential prognostic significance of BiV uptake in ATTR-CA. Methods In this multicentre, observational study, we analysed data of ATTR-CA patients who underwent bone tracer scintigraphy with acquisition of both planar and single photon emission computed tomography (SPECT) imaging. Cardiac uptake was defined according to the Perugini visual scale. Planar BiV uptake was defined according to right ventricle (RV) uptake: 0= absent, 1= < bone, 2= equal to bone, and 3= > bone and confirmed by SPECT imaging. The primary outcome was a composite of cardiac death or hospitalization for heart failure. The secondary outcome was all-cause mortality. Results All 124 ATTR-CA patients enrolled had LV and RV free wall uptake on SPECT images. Of them, 93 (75%) had BiV uptake visible on planar scintigraphy. BiV uptake was found in 14%, 70%, and 92% of Perugini grade 1, 2 and 3 respectively. Compared to those with isolated LV uptake, patients with BiV uptake were older (81 vs 77 years, p=0.006) and more frequently in NYHA≥3 (32% vs 10%, p=0.018). During a median follow-up of 21 months, BiV uptake was associated with a greater occurrence of the primary outcome compared to isolated LV uptake (40% vs 19%, p=0.021), whereas the Perugini scale was not (p=0.2) (Figure 1). At multivariable analysis, NYHA class ≥3 (hazard ratio [HR] 8.1, p=0.007), eGFR <60 ml/min (HR 2.1, p=0.025) and higher degree of RV uptake (HR 1.69, p=0.007) emerged as independent prognostic parameters. In an external cohort of 463 ATTR-CA patients with a median follow-up of 30 months, planar BiV uptake was independently associated with all-cause mortality, with an incremental risk in higher grades of RV uptake (p<0.001) (Figure 1). Conclusions The presence of BiV uptake at planar scintigraphy identified ATTR-CA patients with worse cardiovascular and global outcomes (Figure 2), potentially serving as a novel prognostic marker. Funding Acknowledgement Type of funding sources: None.

Стилі APA, Harvard, Vancouver, ISO та ін.

37

De la Torre-Robles, Daniel, Francisco Dominguez-Serna, Gisell Lorena Osorio, Alfred B. U’Ren, David Bermudez, and Karina Garay-Palmett. "Frequency and polarization emission properties of a photon-pair source based on a photonic crystal fiber." Scientific Reports 11, no. 1 (September 10, 2021). http://dx.doi.org/10.1038/s41598-021-97563-2.

Повний текст джерела

Анотація:

AbstractIn this work, we experimentally demonstrate a photon-pair source with correlations in the frequency and polarization degrees of freedom. We base our source on the spontaneous four-wave mixing (SFWM) process in a photonic crystal fiber. We show theoretically that the two-photon state is the coherent superposition of up to six distinct SFWM processes, each corresponding to a distinct combination of polarizations for the four waves involved and giving rise to an energy-conserving pair of peaks. Our experimental measurements, both in terms of single and coincidence counts, confirm the presence of these pairs of peaks, while we also present related numerical simulations with excellent experiment-theory agreement. We explicitly show how the pump frequency and polarization may be used to effectively control the signal-idler photon-pair properties, defining which of the six processes can participate in the overall two-photon state and at which optical frequencies. We analyze the signal-idler correlations in frequency and polarization, and in terms of fiber characterization, we input the SFWM-peak experimental data into a genetic algorithm which successfully predicts the values of the parameters that characterize the fiber cross section, as well as predict the particular SFWM process associated with a given pair of peaks. We believe our work will help advance the exploitation of photon-pair correlations in the frequency and polarization degrees of freedom.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Kurochkin, N. S., S. A. Savinov, Dongxue Bi, V. V. Sychev, S. P. Eliseev, and A. V. Gritsienko. "Characterization of Milled High-Pressure High-Temperature NV-Center Nanodiamonds for Single-Photon Source Applications." Journal of Russian Laser Research, November 25, 2021. http://dx.doi.org/10.1007/s10946-021-10013-2.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Single-photon sources characterization"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями