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https://www.readbyqxmd.com/read/28624726/holographic-characterization-of-contaminants-in-water-differentiation-of-suspended-particles-in-heterogeneous-dispersions
#1
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
#2
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
#3
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
#4
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
https://www.readbyqxmd.com/read/28602884/autostereoscopic-3d-neuronavigation-to-the-sella-technical-note
#5
A Nimer Amr, Jens Conrad, Sven Kantelhardt, Alf Giese
BACKGROUND: A drawback of conventional neuronavigation is the necessity of focusing on 2D-images in three planes at the same time to determine one's position in the operation field. A solution would be to merge the images into a single 3D-image that mirrors the actual anatomy. This solution has hitherto been hindered by technical limitations. The introduction of holographic-glassless 3D-monitors paved the way to 3D-navigation. OBJECTIVE: We present our experience with 3D-neuronavigation as exemplified by navigation to and within the sella...
June 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28599556/acoustic-force-measurements-on-polymer-coated-microbubbles-in-a-microfluidic-device
#6
Gianluca Memoli, Christopher R Fury, Kate O Baxter, Pierre N Gélat, Philip H Jones
This work presents an acoustofluidic device for manipulating coated microbubbles, designed for the simultaneous use of optical and acoustical tweezers. A comprehensive characterization of the acoustic pressure in the device is presented, obtained by the synergic use of different techniques in the range of acoustic frequencies where visual observations showed aggregation of polymer-coated microbubbles. In absence of bubbles, the combined use of laser vibrometry and finite element modelling supported a non-invasive measurement of the acoustic pressure and an enhanced understanding of the system resonances...
May 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28586730/a-multifunctional-organosilica-cross-linker-for-the-bio-conjugation-of-gold-nanorods
#7
Sarah Lai, Sonia Centi, Claudia Borri, Fulvio Ratto, Lucia Cavigli, Filippo Micheletti, Bjӧrn Kemper, Steffi Ketelhut, Tatiana Kozyreva, Leonardo Gonnelli, Francesca Rossi, Stefano Colagrande, Roberto Pini
We report on the use of organosilica shells to couple gold nanorods to functional peptides and modulate their physiochemical and biological profiles. In particular, we focus on the case of cell penetrating peptides, which are used to load tumor-tropic macrophages and implement an innovative drug delivery system for photothermal and photoacoustic applications. The presence of organosilica exerts subtle effects on multiple parameters of the particles, including their size, shape, electrokinetic potential, photostability, kinetics of endocytic uptake and cytotoxicity, which are investigated by the interplay of colorimetric methods and digital holographic microscopy...
May 31, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28581771/surface-states-in-holographic-weyl-semimetals
#8
Markus Heinrich, Amadeo Jiménez-Alba, Sebastian Moeckel, Martin Ammon
We study the surface states of a strongly coupled Weyl semimetal within holography. By explicit numerical computation of an inhomogeneous holographic Weyl semimetal, we observe the appearance of an electric current restricted to the surface in the presence of an electric chemical potential. The integrated current is universal in the sense that it only depends on the topology of the phases showing that the bulk-boundary correspondence holds even at strong coupling. The implications of this result are subtle and may shed some light on anomalous transport at weak coupling...
May 19, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28580935/control-of-morphology-and-formation-of-highly-geometrically-confined-magnetic-skyrmions
#9
Chiming Jin, Zi-An Li, András Kovács, Jan Caron, Fengshan Zheng, Filipp N Rybakov, Nikolai S Kiselev, Haifeng Du, Stefan Blügel, Mingliang Tian, Yuheng Zhang, Michael Farle, Rafal E Dunin-Borkowski
The ability to controllably manipulate magnetic skyrmions, small magnetic whirls with particle-like properties, in nanostructured elements is a prerequisite for incorporating them into spintronic devices. Here, we use state-of-the-art electron holographic imaging to directly visualize the morphology and nucleation of magnetic skyrmions in a wedge-shaped FeGe nanostripe that has a width in the range of 45-150 nm. We find that geometrically-confined skyrmions are able to adopt a wide range of sizes and ellipticities in a nanostripe that are absent in both thin films and bulk materials and can be created from a helical magnetic state with a distorted edge twist in a simple and efficient manner...
June 5, 2017: Nature Communications
https://www.readbyqxmd.com/read/28569850/tunable-time-resolved-tick-tock-pulsed-digital-holographic-microscopy-for-ultrafast-events
#10
Yu-Chih Lin, Chau-Jern Cheng, Li-Chien Lin
This study presents a time-resolved imaging technique for detecting ultrafast events in the sample with tunable tick-tock pulses in common-path digital holographic microscopy. The tick-tock pulses are generated from the same single femtosecond pulse source and manipulated through a spatial-multiplexing encoding/decoding scheme with two complementary binary codes for digital hologram recording and reconstruction. The spatial-multiplexing encoding/decoding scheme with compressive sensing on the Fresnel digital hologram is used to recover missing data and achieve high-fidelity wavefront reconstruction...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28564690/volume-holographic-imaging-endoscopic-design-and-construction-techniques
#11
Isela D Howlett, Wanglei Han, Michael Gordon, Photini Rice, Jennifer K Barton, Raymond K Kostuk
No abstract text is available yet for this article.
May 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28562002/dual-imprinted-polymer-thin-films-via-pattern-directed-self-organization
#12
Danielle Grolman, Diya Bandyopadhyay, Abdullah Al-Enizi, Ahmed Elzatahry, Alamgir Karim
Synthetic topographically patterned films and coatings are typically contoured on one side, yet many of nature's surfaces have distinct textures on different surfaces of the same object. Common examples are the top and bottom sides of the butterfly wing or lotus leaf, onion shells, and the inside versus outside of the stem of a flower. Inspired by nature, we create dual (top and bottom) channel patterned polymer films. To this end, we first develop a novel fabrication method to create ceramic line channel relief structures by converting the oligomeric residue of stamped poly(dimethylsiloxane) (PDMS) nanopatterns on silicon substrates to glass (SiOx, silica) by ultraviolet-ozone (UVO) exposure...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28547897/mannich-curcuminoids-as-potent-anticancer-agents
#13
Márió Gyuris, László Hackler, Lajos I Nagy, Róbert Alföldi, Eszter Rédei, Annamária Marton, Tibor Vellai, Nóra Faragó, Béla Ózsvári, Anasztázia Hetényi, Gábor K Tóth, Péter Sipos, Iván Kanizsai, László G Puskás
A series of novel curcuminoids were synthesised for the first time via a Mannich-3CR/organocatalysed Claisen-Schmidt condensation sequence. Structure-activity relationship (SAR) studies were performed by applying viability assays and holographic microscopic imaging to these curcumin analogues for anti-proliferative activity against A549 and H1975 lung adenocarcinoma cells. The TNFα-induced NF-κB inhibition and autophagy induction effects correlated strongly with the cytotoxic potential of the analogues. Significant inhibition of tumour growth was observed when the most potent analogue 44 was added in liposomes at one-sixth of the maximally tolerated dose in the A549 xenograft model...
May 26, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28545236/thermal-characterization-of-dynamic-silicon-cantilever-array-sensors-by-digital-holographic-microscopy
#14
Marjan Zakerin, Antonin Novak, Masaya Toda, Yves Emery, Filipe Natalio, Hans-Jürgen Butt, Rüdiger Berger
In this paper, we apply a digital holographic microscope (DHM) in conjunction with stroboscopic acquisition synchronization. Here, the temperature-dependent decrease of the first resonance frequency (S₁(T)) and Young's elastic modulus (E₁(T)) of silicon micromechanical cantilever sensors (MCSs) are measured. To perform these measurements, the MCSs are uniformly heated from T₀ = 298 K to T = 450 K while being externally actuated with a piezo-actuator in a certain frequency range close to their first resonance frequencies...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28521132/linking-neurons-to-network-function-and-behavior-by-two-photon-holographic-optogenetics-and-volumetric-imaging
#15
Marco Dal Maschio, Joseph C Donovan, Thomas O Helmbrecht, Herwig Baier
We introduce a flexible method for high-resolution interrogation of circuit function, which combines simultaneous 3D two-photon stimulation of multiple targeted neurons, volumetric functional imaging, and quantitative behavioral tracking. This integrated approach was applied to dissect how an ensemble of premotor neurons in the larval zebrafish brain drives a basic motor program, the bending of the tail. We developed an iterative photostimulation strategy to identify minimal subsets of channelrhodopsin (ChR2)-expressing neurons that are sufficient to initiate tail movements...
May 17, 2017: Neuron
https://www.readbyqxmd.com/read/28518051/red-blood-cells-ageing-markers-a-multi-parametric-analysis
#16
Manon Bardyn, Benjamin Rappaz, Keyvan Jaferzadeh, David Crettaz, Jean-Daniel Tissot, Inkyu Moon, Gerardo Turcatti, Niels Lion, Michel Prudent
BACKGROUND: Red blood cells collected in citrate-phosphate-dextrose can be stored for up to 42 days at 4 °C in saline-adenine-glucose-mannitol additive solution. During this controlled, but nevertheless artificial, ex vivo ageing, red blood cells accumulate lesions that can be reversible or irreversible upon transfusion. The aim of the present study is to follow several parameters reflecting cell metabolism, antioxidant defences, morphology and membrane dynamics during storage. MATERIALS AND METHODS: Five erythrocyte concentrates were followed weekly during 71 days...
May 2017: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/28516906/nanometric-holograms-based-on-a-topological-insulator-material
#17
Zengji Yue, Gaolei Xue, Juan Liu, Yongtian Wang, Min Gu
Holography has extremely extensive applications in conventional optical instruments spanning optical microscopy and imaging, three-dimensional displays and metrology. To integrate holography with modern low-dimensional electronic devices, holograms need to be thinned to a nanometric scale. However, to keep a pronounced phase shift modulation, the thickness of holograms has been generally limited to the optical wavelength scale, which hinders their integration with ultrathin electronic devices. Here, we break this limit and achieve 60 nm holograms using a topological insulator material...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28512312/two-step-phase-shifting-differential-recording-digital-holographic-microscopy
#18
Jun-He Han, Ruo-Ping Li, Jun-Hui Liu, Fu-Sheng Hai, Ming-Ju Huang
We present two-step phase-shifting differential-recording digital holographic microscopy (TPD-DH in microscopy) for phase imaging of microscopic transparent elements. Two CCDs are employed to record two interferograms at two different defocusing distances. The interferograms on the two CCD cameras are shifted for a phase retarder 0 and π via an all-optics phase shifting unit. A novel algorithm is proposed to reconstruct both amplitude and phase distributions of the object wave from the recorded interferograms...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28490794/thermally-induced-micro-motion-by-inflection-in-optical-potential
#19
Martin Šiler, Petr Jákl, Oto Brzobohatý, Artem Ryabov, Radim Filip, Pavel Zemánek
Recent technological progress in a precise control of optically trapped objects allows much broader ventures to unexplored territory of thermal motion in non-linear potentials. In this work, we exploit an experimental set-up of holographic optical tweezers to experimentally investigate Brownian motion of a micro-particle near the inflection point of the cubic optical potential. We present two complementary views on the non-linear Brownian motion. On an ensemble of stochastic trajectories, we simultaneously determine (i) the detailed short-time position statistics and (ii) the long-distance first-passage time statistics...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28488437/strain-multiplexed-metasurface-holograms-on-a-stretchable-substrate
#20
Stephanie C Malek, Ho-Seok Ee, Ritesh Agarwal
We demonstrate reconfigurable phase-only computer-generated metasurface holograms with up to three image planes operating in the visible regime fabricated with gold nanorods on a stretchable polydimethylsiloxane substrate. Stretching the substrate enlarges the hologram image and changes the location of the image plane. Upon stretching, these devices can switch the displayed holographic image between multiple distinct images. This work opens up the possibilities for stretchable metasurface holograms as flat devices for dynamically reconfigurable optical communication and display...
June 14, 2017: Nano Letters
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