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https://www.readbyqxmd.com/read/28731750/coupling-constant-corrections-in-a-holographic-model-of-heavy-ion-collisions
#1
Sašo Grozdanov, Wilke van der Schee
We initiate a holographic study of coupling-dependent heavy ion collisions by analyzing, for the first time, the effects of leading-order, inverse coupling constant corrections. In the dual description, this amounts to colliding gravitational shock waves in a theory with curvature-squared terms. We find that, at intermediate coupling, nuclei experience less stopping and have more energy deposited near the light cone. When the decreased coupling results in an 80% larger shear viscosity, the time at which hydrodynamics becomes a good description of the plasma created from high energy collisions increases by 25%...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28724961/coherence-properties-of-different-light-sources-and-their-effect-on-the-image-sharpness-and-speckle-of-holographic-displays
#2
Yuanbo Deng, Daping Chu
Coherence properties of different light sources and how they affect the image quality of holographic display are investigated. Temporal coherence is related to the intrinsic spectrum bandwidth of the light source, while spatial coherence can be affected by the size of the light source and propagation distance in use. These two coherence properties are measured for various light sources of diode-pumped solid-state (DPSS) laser, laser diode (LD), light emitting diode (LED), super luminescent light emitting diode (sLED) and micro light emitting diode (mLED) in different settings, together with the quality of the holographic reconstructed images...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28722051/holographic-microscope-slide-in-a-spatio-temporal-imaging-modality-for-reliable-3d-cell-counting
#3
Biagio Mandracchia, Vittorio Bianco, Zhe Wang, Martina Mugnano, Alessia Bramanti, Melania Paturzo, Pietro Ferraro
In the current trend of miniaturization and simplification of imaging flow cytometry, Lab-on-a-Chip (LoC) microfluidic devices represent an innovative and cost-effective solution. In this framework, we propose for the first time a novel platform based on the compactness of a holographic microscope slide (HMS) in combination with the new computational features of space-time digital holography (STDH) that uses a 1D linear sensor array (LSA) instead of 2D CCD or CMOS cameras to respond to real diagnostic needs...
July 19, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28718848/label-free-high-throughput-holographic-screening-and-enumeration-of-tumor-cells-in-blood
#4
Dhananjay Kumar Singh, Caroline C Ahrens, Wei Li, Siva A Vanapalli
We introduce inline digital holographic microscopy (in-line DHM) as a label-free technique for detecting tumor cells in blood. The optimized DHM platform fingerprints every cell flowing through a microchannel at 10 000 cells per second, based on three features - size, maximum intensity and mean intensity. To identify tumor cells in a background of blood cells, we developed robust gating criteria using machine-learning approaches. We established classifiers from the features extracted from 100 000-cell training sets consisting of red blood cells, peripheral blood mononuclear cells and tumor cell lines...
July 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28708412/digital-holographic-microscopy-a-method-for-detection-of-microorganisms-in-plume-samples-from-enceladus-and-other-icy-worlds
#5
Manuel Bedrossian, Chris Lindensmith, Jay L Nadeau
Detection of extant microbial life on Earth and elsewhere in the Solar System requires the ability to identify and enumerate micrometer-scale, essentially featureless cells. On Earth, bacteria are usually enumerated by culture plating or epifluorescence microscopy. Culture plates require long incubation times and can only count culturable strains, and epifluorescence microscopy requires extensive staining and concentration of the sample and instrumentation that is not readily miniaturized for space. Digital holographic microscopy (DHM) represents an alternative technique with no moving parts and higher throughput than traditional microscopy, making it potentially useful in space for detection of extant microorganisms provided that sufficient numbers of cells can be collected...
July 14, 2017: Astrobiology
https://www.readbyqxmd.com/read/28696538/dimension-controllable-microtube-arrays-by-dynamic-holographic-processing-as-3d-yeast-culture-scaffolds-for-asymmetrical-growth-regulation
#6
Shengyun Ji, Liang Yang, Yanlei Hu, Jincheng Ni, Wenqiang Du, Jiawen Li, Gang Zhao, Dong Wu, Jiaru Chu
Transparent microtubes can function as unique cell culture scaffolds, because the tubular 3D microenvironment they provide is very similar to the narrow space of capillaries in vivo. However, how to realize the fabrication of microtube-arrays with variable cross-section dynamically remains challenging. Here, a dynamic holographic processing method for producing high aspect ratio (≈20) microtubes with tunable outside diameter (6-16 µm) and inside diameter (1-10 µm) as yeast culture scaffolds is reported...
July 11, 2017: Small
https://www.readbyqxmd.com/read/28687769/computational-sensing-of-herpes-simplex-virus-using-a-cost-effective-on-chip-microscope
#7
Aniruddha Ray, Mustafa Ugur Daloglu, Joslynn Ho, Avee Torres, Euan Mcleod, Aydogan Ozcan
Caused by the herpes simplex virus (HSV), herpes is a viral infection that is one of the most widespread diseases worldwide. Here we present a computational sensing technique for specific detection of HSV using both viral immuno-specificity and the physical size range of the viruses. This label-free approach involves a compact and cost-effective holographic on-chip microscope and a surface-functionalized glass substrate prepared to specifically capture the target viruses. To enhance the optical signatures of individual viruses and increase their signal-to-noise ratio, self-assembled polyethylene glycol based nanolenses are rapidly formed around each virus particle captured on the substrate using a portable interface...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687041/enhanced-nonlinear-optical-effect-in-hybrid-liquid-crystal-cells-based-on-photonic-crystal
#8
Svitlana Bugaychuk, Andrey Iljin, Oleg Lytvynenko, Ludmila Tarakhan, Lulmila Karachevtseva
Nonlinear-optical response of photorefractive hybrid liquid crystal (LC) cells has been studied by means of dynamic holographic technique in two-wave mixing arrangement. The LC cells include nonuniform silicon substrates comprising a micrometer-range photonic crystal. A thin LC layer is set between silicon substrate and a flat glass substrate covered by a transparent (ITO) electrode. A dynamic diffraction grating was induced in the LC volume by the two-wave mixing of laser beams with simultaneous application of DC electric field to the cell...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28682622/multiplexed-holograms-by-surface-plasmon-propagation-and-polarized-scattering
#9
Ji Chen, Tao Li, Shuming Wang, Shining Zhu
Thanks to the superiority in controlling the optical wave fronts, plasmonic nanostructures have led to various striking applications, among which metasurface holograms have been well developed and endowed with strong multiplexing capability. Here, we report a new design of multiplexed plasmonic hologram, which allows for reconstruction of multiple holographic images in free space by scatterings of surface plasmon polariton (SPP) waves in different propagation directions. Besides, the scattered polarization states can be further modulated by arranging the orientations of nanoscatterers...
July 10, 2017: Nano Letters
https://www.readbyqxmd.com/read/28679246/a-single-sided-representation-for-the-homogeneous-green-s-function-of-a-unified-scalar-wave-equation
#10
Kees Wapenaar
A unified scalar wave equation is formulated, which covers three-dimensional (3D) acoustic waves, 2D horizontally-polarised shear waves, 2D transverse-electric EM waves, 2D transverse-magnetic EM waves, 3D quantum-mechanical waves and 2D flexural waves. The homogeneous Green's function of this wave equation is a combination of the causal Green's function and its time-reversal, such that their singularities at the source position cancel each other. A classical representation expresses this homogeneous Green's function as a closed boundary integral...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28674409/conformable-holographic-metasurfaces
#11
James Burch, Dandan Wen, Xianzhong Chen, Andrea Di Falco
Metasurface holograms are typically fabricated on rigid substrates. Here we experimentally demonstrate broadband, flexible, conformable, helicity multiplexed metasurface holograms operating in the visible range, offering increased potential for real life out-of-the-lab applications. Two symmetrically distributed holographic images are obtained when circularly polarized light impinges on the reflective-type metasurface positioned on non-planar targets. The two off-axis images with high fidelity are interchangeable by controlling the helicity of incident light...
July 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28663877/subsampled-phase-retrieval-for-temporal-resolution-enhancement-in-lensless-on-chip-holographic-video
#12
Donghun Ryu, Zihao Wang, Kuan He, Guoan Zheng, Roarke Horstmeyer, Oliver Cossairt
On-chip holographic video is a convenient way to monitor biological samples simultaneously at high spatial resolution and over a wide field-of-view. However, due to the limited readout rate of digital detector arrays, one often faces a tradeoff between the per-frame pixel count and frame rate of the captured video. In this report, we propose a subsampled phase retrieval (SPR) algorithm to overcome the spatial-temporal trade-off in holographic video. Compared to traditional phase retrieval approaches, our SPR algorithm uses over an order of magnitude less pixel measurements while maintaining suitable reconstruction quality...
March 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28660861/three-dimensional-single-cell-imaging-with-x-ray-waveguides-in-the-holographic-regime
#13
Martin Krenkel, Mareike Toepperwien, Frauke Alves, Tim Salditt
X-ray tomography at the level of single biological cells is possible in a low-dose regime, based on full-field holographic recordings, with phase contrast originating from free-space wave propagation. Building upon recent progress in cellular imaging based on the illumination by quasi-point sources provided by X-ray waveguides, here this approach is extended in several ways. First, the phase-retrieval algorithms are extended by an optimized deterministic inversion, based on a multi-distance recording. Second, different advanced forms of iterative phase retrieval are used, operational for single-distance and multi-distance recordings...
July 1, 2017: Acta Crystallographica. Section A, Foundations and Advances
https://www.readbyqxmd.com/read/28652591/opposite-view-digital-holographic-microscopy-with-autofocusing-capability
#14
Juanjuan Zheng, Peng Gao, Xiaopeng Shao
Digital holographic microscopy (DHM) has its intrinsic ability to refocusing a sample by numerically propagating an object wave from its hologram plane to its image plane. In this paper opposite-view digital holographic microscopy (OV-DHM) is demonstrated for autofocusing, namely, digitally determining the location of the image plane, and refocusing the object wave without human intervention. In OV-DHM, a specimen is illuminated from two sides in a 4π-alike configuration, and two holograms are generated and recorded by a CCD camera along two orthogonal polarization orientations...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28651199/aberration-corrected-stem-by-means-of-diffraction-gratings
#15
Martin Linck, Peter A Ercius, Jordan S Pierce, Benjamin J McMorran
In the past 15 years, the advent of aberration correction technology in electron microscopy has enabled materials analysis on the atomic scale. This is made possible by precise arrangements of multipole electrodes and magnetic solenoids to compensate the aberrations inherent to any focusing element of an electron microscope. Here, we describe an alternative method to correct for the spherical aberration of the objective lens in scanning transmission electron microscopy (STEM) using a passive, nanofabricated diffractive optical element...
June 12, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28646270/release-from-pi-an-analysis-and-a-model
#16
D J K Mewhort, Kevin D Shabahang, D R J Franklin
Recall decreases across a series of subspan immediate-recall trials but rebounds if the semantic category of the words is changed, an example of release from proactive interference (RPI). The size of the rebound depends on the semantic categories used and ranges from 0% to 95%. We used a corpus of novels to create vectors representing the meaning of about 40,000 words using the BEAGLE algorithm. The distance between categories and spread within categories jointly predicted the size of the RPI. We used a holographic model for recall equipped with a lexicon of BEAGLE vectors representing the meaning of words...
June 23, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28624726/holographic-characterization-of-contaminants-in-water-differentiation-of-suspended-particles-in-heterogeneous-dispersions
#17
Laura A Philips, David B Ruffner, Fook Chiong Cheong, Jaroslaw M Blusewicz, Priya Kasimbeg, Basma Waisi, Jeffrey R McCutcheon, David G Grier
Determining the size distribution and composition of particles suspended in water can be challenging in heterogeneous multicomponent samples. Light scattering techniques can measure the distribution of particle sizes, but provide no basis for distinguishing different types of particles. Direct imaging techniques can categorize particles by shape, but offer few insights into their composition. Holographic characterization meets this need by directly measuring the size, refractive index, and three-dimensional position of individual particles in a suspension...
June 7, 2017: Water Research
https://www.readbyqxmd.com/read/28619939/coherent-imaging-of-an-attosecond-electron-wave-packet
#18
D M Villeneuve, Paul Hockett, M J J Vrakking, Hiromichi Niikura
Electrons detached from atoms or molecules by photoionization carry information about the quantum state from which they originate, as well as the continuum states into which they are released. Generally, the photoelectron momentum distribution is composed of a coherent sum of angular momentum components, each with an amplitude and phase. Here we show, by using photoionization of neon, that a train of attosecond pulses synchronized with an infrared laser field can be used to disentangle these angular momentum components...
June 16, 2017: Science
https://www.readbyqxmd.com/read/28614333/dual-page-reproduction-to-increase-the-data-transfer-rate-in-holographic-memory
#19
Tetsuhiko Muroi, Yutaro Katano, Nobuhiro Kinoshita, Norihiko Ishii
To increase the reproduced data transfer rate in holographic memory, we have investigated simultaneous reproduction of two data pages. By irradiating s- and p-polarization reference beams whose angle gap is equal to the angle between the neighboring data pages in angle-multiplexed holograms, two different data pages can simultaneously be reproduced with a bit error rate low enough to decode. This technology is effective to double the data transfer rate in holographic memory.
June 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28614329/aliasing-coherence-and-resolution-in-a-lensless-holographic-microscope
#20
Temitope E Agbana, Hai Gong, Abena S Amoah, Vitaly Bezzubik, Michel Verhaegen, Gleb Vdovin
We have shown that the maximum achievable resolution of an in-line lensless holographic microscope is limited by aliasing and, for collimated illumination, cannot exceed the camera pixel size. This limit can be achieved only when the optimal conditions on the spatial and temporal coherence state of the illumination are satisfied. The expressions defining the configuration, delivering maximum resolution with given spatial and temporal coherence of the illumination, are obtained. The validity of these conditions is confirmed experimentally...
June 15, 2017: Optics Letters
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