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https://www.readbyqxmd.com/read/28724934/full-color-large-area-transmissive-holograms-enabled-by-multi-level-diffractive-optics
#1
Nabil Mohammad, Monjurul Meem, Xiaowen Wan, Rajesh Menon
We show that multi-level diffractive microstructures can enable broadband, on-axis transmissive holograms that can project complex full-color images, which are invariant to viewing angle. Compared to alternatives like metaholograms, diffractive holograms utilize much larger minimum features (>10 µm), much smaller aspect ratios (<0.2) and thereby, can be fabricated in a single lithography step over relatively large areas (>30 mm ×30 mm). We designed, fabricated and characterized holograms that encode various full-color images...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28696538/dimension-controllable-microtube-arrays-by-dynamic-holographic-processing-as-3d-yeast-culture-scaffolds-for-asymmetrical-growth-regulation
#2
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/28682622/multiplexed-holograms-by-surface-plasmon-propagation-and-polarized-scattering
#3
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/28674409/conformable-holographic-metasurfaces
#4
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/28652591/opposite-view-digital-holographic-microscopy-with-autofocusing-capability
#5
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/28646270/release-from-pi-an-analysis-and-a-model
#6
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/28635308/combined-hqsar-topomer-comfa-homology-modeling-and-docking-studies-on-triazole-derivatives-as-sglt2-inhibitors
#7
Shuling Yu, Jintao Yuan, Yi Zhang, Shufang Gao, Ying Gan, Meng Han, Yuewen Chen, Qiaoqiao Zhou, Jiahua Shi
AIM: Sodium-glucose cotransporter 2 (SGLT2) is a promising target for diabetes therapy. We aimed to develop computational approaches to identify structural features for more potential SGLT2 inhibitors. MATERIALS & METHODS: In this work, 46 triazole derivatives as SGLT2 inhibitors were studied using a combination of several approaches, including hologram quantitative structure-activity relationships (HQSAR), topomer comparative molecular field analysis (CoMFA), homology modeling, and molecular docking...
June 21, 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/28614342/controlled-noncanonical-vortices-from-higher-order-fractional-screw-dislocations
#8
Satyajit Maji, Maruthi M Brundavanam
A pair of stable noncanonical scalar vortices of the same charge is generated experimentally across the cross section of an optical beam using a computer-generated hologram with higher-order fractional screw dislocation. The noncanonical nature of the generated vortices is identified by the gradient of the phase around each vortex and also the crossing angle between the zero contours of the real and imaginary parts of the optical field. The anisotropy of the vortices is controlled by the fractional order of the computer-generated hologram...
June 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28614333/dual-page-reproduction-to-increase-the-data-transfer-rate-in-holographic-memory
#9
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/28598408/anti-mycobacterial-evaluation-of-7-chloro-4-aminoquinolines-and-hologram-quantitative-structure-activity-relationship-hqsar-modeling-of-amino-imino-tautomers
#10
Marcelle L F Bispo, Camilo H S Lima, Laura N F Cardoso, André L P Candéa, Flávio A F M Bezerra, Maria C S Lourenço, Maria G M O Henriques, Ricardo B Alencastro, Carlos R Kaiser, Marcus V N Souza, Magaly G Albuquerque
In an ongoing research program for the development of new anti-tuberculosis drugs, we synthesized three series (A, B, and C) of 7-chloro-4-aminoquinolines, which were evaluated in vitro against Mycobacterium tuberculosis (MTB). Now, we report the anti-MTB and cytotoxicity evaluations of a new series, D (D01-D21). Considering the active compounds of series A (A01-A13), B (B01-B13), C (C01-C07), and D (D01-D09), we compose a data set of 42 compounds and carried out hologram quantitative structure-activity relationship (HQSAR) analysis...
June 9, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/28584259/complex-beam-shaping-based-on-an-equivalent-q-plate-system-and-analysis-of-its-properties-using-digital-holography-polarization-imaging
#11
Ching-Han Yang, Andy Ying-Guey Fuh
In this study, we generate various complex beams carrying angular momentum (AM) by using a programmable beam shaping system to mimic typical q-plates. When a circularly polarized wave is incident onto the system, the emerging beam reverses its spin handedness and obtains a spatial phase factor. This phase factor can be engineered by designing a computer-generated hologram (CGH) and applying it to a spatial light modulator (SLM) to produce a beam with controllable spatially distributed orbital angular momentum (OAM) density...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28569850/tunable-time-resolved-tick-tock-pulsed-digital-holographic-microscopy-for-ultrafast-events
#12
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/28562002/dual-imprinted-polymer-thin-films-via-pattern-directed-self-organization
#13
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/28537248/measuring-the-orbital-angular-momentum-spectrum-of-an-electron-beam
#14
Vincenzo Grillo, Amir H Tavabi, Federico Venturi, Hugo Larocque, Roberto Balboni, Gian Carlo Gazzadi, Stefano Frabboni, Peng-Han Lu, Erfan Mafakheri, Frédéric Bouchard, Rafal E Dunin-Borkowski, Robert W Boyd, Martin P J Lavery, Miles J Padgett, Ebrahim Karimi
Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with magnetic materials, the wavefunctions of such electrons are inherently modified. Such variations therefore motivate the need to analyse electron wavefunctions, especially their wavefronts, to obtain information regarding the material's structure. Here, we propose, design and demonstrate the performance of a device based on nanoscale holograms for measuring an electron's OAM components by spatially separating them...
May 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524674/holography-of-wi-fi-radiation
#15
Philipp M Holl, Friedemann Reinhard
Wireless data transmission systems such as wi-fi or Bluetooth emit coherent light-electromagnetic waves with a precisely known amplitude and phase. Propagating in space, this radiation forms a hologram-a two-dimensional wave front encoding a three-dimensional view of all objects traversed by the light beam. Here we demonstrate a scheme to record this hologram in a phase-coherent fashion across a meter-sized imaging region. We recover three-dimensional views of objects and emitters by feeding the resulting data into digital reconstruction algorithms...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28516906/nanometric-holograms-based-on-a-topological-insulator-material
#16
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/28509592/molecular-modeling-and-structure-activity-relationships-for-a-series-of-benzimidazole-derivatives-as-cruzain-inhibitors
#17
Ivani Pauli, Leonardo G Ferreira, Mariana L de Souza, Glaucius Oliva, Rafaela S Ferreira, Marco A Dessoy, Brian W Slafer, Luiz C Dias, Adriano D Andricopulo
AIM: Chagas disease is endemic in Latin America and no effective treatment is available. Efforts in drug research have focused on several enzymes from Trypanosoma cruzi, among which cruzain is a validated pharmacological target. METHODOLOGY: Chemometric analyses were performed on the data set using the hologram quantitative structure-activity relationship, comparative molecular field analysis and comparative molecular similarity index analysis methods. Docking simulations were executed using the crystallographic structure of cruzain in complex with a benzimidazole inhibitor...
May 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/28488437/strain-multiplexed-metasurface-holograms-on-a-stretchable-substrate
#18
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
https://www.readbyqxmd.com/read/28482229/detecting-dynamic-responses-of-materials-and-devices-under-an-alternating-electric-potential-by-phase-locked-transmission-electron-microscopy
#19
Kentaro Soma, Stan Konings, Ryotaro Aso, Naoto Kamiuchi, Genki Kobayashi, Hideto Yoshida, Seiji Takeda
An apparatus is developed for transmission electron microscopy (TEM) to acquire image and spectral data, such as TEM images, electron holograms, and electron energy loss spectra, synchronized with the measurement of the dynamic response of a specimen under an applied alternating current (AC) electric potential (voltage, denoted VAC). From a VAC of frequency f, a shutter pulse signal is generated to open and close a pre-specimen shutter in a base TEM apparatus. A pulse is generated per VAC cycle from the targeted phase Φ to Φ +∆Φ with phase width ∆Φ (∆Φ <2π)...
April 29, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28470981/active-phase-transition-via-loss-engineering-in-a-terahertz-mems-metamaterial
#20
Longqing Cong, Prakash Pitchappa, Chengkuo Lee, Ranjan Singh
Controlling the phase of local radiation by using exotic metasurfaces has enabled promising applications in a diversified set of electromagnetic wave manipulation such as anomalous wavefront deflection, flat lenses, and holograms. Here, we theoretically and experimentally demonstrate an active phase transition in a micro-electromechanical system-based metadevice where both the phase response and the dispersion of the metamaterial cavity are dynamically tailored. The phase transition is determined by the radiative and the absorptive losses in a metal-insulator-metal cavity that obeys the coupled-mode theory...
May 4, 2017: Advanced Materials
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