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https://www.readbyqxmd.com/read/27906403/printable-ink-lenses-diffusers-and-2d-gratings
#1
Rajib Ahmed, Ali K Yetisen, Anthony El Khoury, Haider Butt
Advances in holography have led to applications including data storage, displays, security labels, and colorimetric sensors. However, existing top-down approaches for the fabrication of holographic devices are complex, expensive, and expertise dependent, limiting their use in practical applications. Here, ink-based holographic devices have been created for a wide range of applications in diffraction optics. A single pulse of a 3.5 ns Nd:YAG laser allowed selective ablation of ink to nanofabricate planar optical devices...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906347/versatile-spectral-modulation-of-a-broadband-source-for-digital-holographic-microscopy
#2
Gaël Nardin, Tristan Colomb, Yves Emery, Christophe Moser
We demonstrate the potential of spatial light modulators for the spectral control of a broadband source in digital holographic microscopy. Used in a 'pulse-shaping' geometry, the spatial light modulator provides a versatile control over the bandwidth and wavelength of the light source. The control of these properties enables adaptation to various experimental conditions. As a first application, we show that the source bandwidth can be adapted to the off-axis geometry to provide quantitative phase imaging over the whole field of view...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906343/single-distance-phase-retrieval-algorithm-for-bragg-magnifier-microscope
#3
Stanislav Hrivňak, Jozef Uličný, Ladislav Mikeš, Angelica Cecilia, Elias Hamann, Tilo Baumbach, Libor Švéda, Zdenko Zápražný, Dušan Korytár, Eva Gimenez-Navarro, Ulrich H Wagner, Christoph Rau, Hartmut Greven, Patrik Vagovič
We present an improved, single-distance phase retrieval algorithm applicable for holographic X-ray imaging of biological objects for an in-line germanium Bragg Magnifier Microscope (BMM). The proposed algorithm takes advantage of a modified shrink-wrap algorithm for phase objects, robust unwrapping algorithm as well as other reasonable constraints applied to the wavefield at the object and the detector plane. The performance of the algorithm is analyzed on phantom objects and the results are shown and discussed...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906262/light-field-and-holographic-three-dimensional-displays-invited
#4
Masahiro Yamaguchi
A perfect three-dimensional (3D) display that satisfies all depth cues in human vision is possible if a light field can be reproduced exactly as it appeared when it emerged from a real object. The light field can be generated based on either light ray or wavefront reconstruction, with the latter known as holography. This paper first provides an overview of the advances of ray-based and wavefront-based 3D display technologies, including integral photography and holography, and the integration of those technologies with digital information systems...
December 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/27906228/holographic-imaging-with-a-hard-x-ray-nanoprobe-ptychographic-versus-conventional-phase-retrieval
#5
A-L Robisch, J Wallentin, A Pacureanu, P Cloetens, T Salditt
We have performed near-field x-ray imaging with simultaneous object and probe reconstruction. By an advanced ptychographic algorithm based on longitudinal and lateral translations, full-field images of nanoscale objects are reconstructed with quantitative contrast values, along with the extended wavefronts used to illuminate the objects. The imaging scheme makes idealizing assumptions on the probe obsolete, and efficiently disentangles phase shifts related to the object from the imperfections in the illumination...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27901048/sparsity-based-multi-height-phase-recovery-in-holographic-microscopy
#6
Yair Rivenson, Yichen Wu, Hongda Wang, Yibo Zhang, Alborz Feizi, Aydogan Ozcan
High-resolution imaging of densely connected samples such as pathology slides using digital in-line holographic microscopy requires the acquisition of several holograms, e.g., at >6-8 different sample-to-sensor distances, to achieve robust phase recovery and coherent imaging of specimen. Reducing the number of these holographic measurements would normally result in reconstruction artifacts and loss of image quality, which would be detrimental especially for biomedical and diagnostics-related applications...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27897221/plasmonic-metalens-based-on-coupled-resonators-for-focusing-of-surface-plasmons
#7
Quan Xu, Xueqian Zhang, Yuehong Xu, Quan Li, Yanfeng Li, Chunmei Ouyang, Zhen Tian, Jianqiang Gu, Wentao Zhang, Xixiang Zhang, Jiaguang Han, Weili Zhang
As an essential functionality, flexible focusing of surface plasmons (SPs) is of particular interest in nonlinear optics and highly integrated plasmonic circuitry. Here, we developed a versatile plasmonic metalens, a metasurface comprised of coupled subwavelength resonators, whose optical responses exhibit a remarkable feature of electromagnetically induced transparency (EIT). We demonstrate numerically and experimentally how a proper spatial design of the unit elements steers SPs to arbitrary foci based on the holographic principles...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27886509/smooth-horizonless-geometries-deep-inside-the-black-hole-regime
#8
Iosif Bena, Stefano Giusto, Emil J Martinec, Rodolfo Russo, Masaki Shigemori, David Turton, Nicholas P Warner
We construct the first family of horizonless supergravity solutions that have the same mass, charges, and angular momenta as general supersymmetric rotating D1-D5-P black holes in five dimensions. This family includes solutions with arbitrarily small angular momenta, deep within the regime of quantum numbers and couplings for which a large classical black hole exists. These geometries are well approximated by the black-hole solution, and in particular exhibit the same near-horizon throat. Deep in this throat, the black-hole singularity is resolved into a smooth cap...
November 11, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27869846/simultaneous-measurement-of-refractive-index-distribution-and-topography-by-integrated-transmission-and-reflection-digital-holographic-microscopy
#9
Chaojie Ma, Jianglei Di, Jiwei Zhang, Ying Li, Teli Xi, Enpu Li, Jianlin Zhao
We propose a method for simultaneously measuring dynamic changes of the refractive index distribution and surface topography, which integrates the transmission and reflection digital holographic microscopy based on polarization and angular multiplexing techniques. The complex amplitudes of the transmitted and reflected object waves can be simultaneously retrieved. The phase information of the reflected object wave is directly used to determine the topography of the specimen which corresponds to its physical thickness...
November 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/27867717/holographic-tomography-with-scanning-of-illumination-space-domain-reconstruction-for-spatially-invariant-accuracy
#10
Julianna Kostencka, Tomasz Kozacki, Arkadiusz Kuś, Björn Kemper, Małgorzata Kujawińska
The paper presents two novel, space-domain reconstruction algorithms for holographic tomography utilizing scanning of illumination and a fixed detector that is highly suitable for imaging of living biomedical specimens. The first proposed algorithm is an adaptation of the filtered backpropagation to the scanning illumination tomography. Its space-domain implementation enables avoiding the error-prone interpolation in the Fourier domain, which is a significant problem of the state-of-the-art tomographic algorithm...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27857428/holographic-tracking-and-sizing-of-optically-trapped-microprobes-in-diamond-anvil-cells
#11
F Saglimbeni, S Bianchi, G Gibson, R Bowman, M Padgett, R Di Leonardo
We demonstrate that Digital Holographic Microscopy can be used for accurate 3D tracking and sizing of a colloidal probe trapped in a diamond anvil cell (DAC). Polystyrene beads were optically trapped in water up to Gigapascal pressures while simultaneously recording in-line holograms at 1 KHz frame rate. Using Lorenz-Mie scattering theory to fit interference patterns, we detected a 10% shrinking in the bead's radius due to the high applied pressure. Accurate bead sizing is crucial for obtaining reliable viscosity measurements and provides a convenient optical tool for the determination of the bulk modulus of probe material...
November 14, 2016: Optics Express
https://www.readbyqxmd.com/read/27857417/4d-holographic-microscopy-of-zebrafish-larvae-microcirculation
#12
Dario Donnarumma, Alexey Brodoline, Daniel Alexandre, Michel Gross
An original technique that combines digital holography, dual illumination of the sample and cleaning algorithm 3D reconstruction is proposed. It uses a standard transmission microscopy setup coupled with a digital holography detection. The technique is 4D, since it allows to determine, at each time step, the 3D locations (x,y,z) of many moving objects that scatter the dual illumination beam. The technique has been validated by imaging the microcirculation of blood in a fish larvae sample (the moving objects are thus red blood cells RBCs)...
November 14, 2016: Optics Express
https://www.readbyqxmd.com/read/27857325/holographic-waveguide-display-with-a-combined-grating-in-coupler
#13
Jingjing Guo, Yan Tu, Lanlan Yang, Lili Wang, Baoping Wang
Volume holographic gratings are widely used as couplers in eyewear waveguide display systems, but they show a relative lower TM polarized energy compared to transverse-electric (TE) incidence. In this paper, we propose a novel holographic waveguide display system with a combined-grating as the in-coupler. When used as an in-coupler for a holographic waveguide display system, a subwavelength metal grating is designed onto the volume holographic grating to increase the total diffraction efficiency of the coupling gratings...
November 10, 2016: Applied Optics
https://www.readbyqxmd.com/read/27847867/multicolor-3d-meta-holography-by-broadband-plasmonic-modulation
#14
Xiong Li, Lianwei Chen, Yang Li, Xiaohu Zhang, Mingbo Pu, Zeyu Zhao, Xiaoliang Ma, Yanqin Wang, Minghui Hong, Xiangang Luo
As nanofabrication technology progresses, the emerging metasurface has offered unique opportunities for holography, such as an increased data capacity and the realization of polarization-sensitive functionality. Multicolor three-dimensional (3D) meta-hologram imaging is one of the most pursued applications for meta-hologram not yet realized. How to reduce the cross-talk among different colors in broad bandwidth designs is a critical question. On the basis of the off-axis illumination method, we develop a novel way to overcome the cross-talk limitation and achieve multicolor meta-holography with a single type of plasmonic pixel...
November 2016: Science Advances
https://www.readbyqxmd.com/read/27828949/moir%C3%A3-alignment-algorithm-for-an-aberration-corrected-holographic-grating-exposure-system-and-error-analysis
#15
Xulong Zhao, Bayanheshig, Wenhao Li, Jiang Yanxiu, Ying Song, Xiaotian Li, Shan Jiang, Na Wu
To meet the required manufacturing accuracy of high-quality aberration-corrected holographic gratings, we propose a moiré alignment algorithm for the exposure system of holographic gratings. A model holographic grating exposure system is built with multiple degrees of freedom based on optical path function theory. The whole process algorithm is then derived, including the fourth-order orthogonal polynomial of the holographic gratings, fitted aberration coefficients, and an optimized Levenberg-Marquardt algorithm for the exposure system's recording parameters...
November 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27828515/phenomenological-modeling-of-nonlinear-holograms-based-on-metallic-geometric-metasurfaces
#16
Weimin Ye, Xin Li, Juan Liu, Shuang Zhang
Benefiting from efficient local phase and amplitude control at the subwavelength scale, metasurfaces offer a new platform for computer generated holography with high spatial resolution. Three-dimensional and high efficient holograms have been realized by metasurfaces constituted by subwavelength meta-atoms with spatially varying geometries or orientations. Metasurfaces have been recently extended to the nonlinear optical regime to generate holographic images in harmonic generation waves. Thus far, there has been no vector field simulation of nonlinear metasurface holograms because of the tremendous computational challenge in numerically calculating the collective nonlinear responses of the large number of different subwavelength meta-atoms in a hologram...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27828470/acceleration-of-the-calculation-speed-of-computer-generated-holograms-using-the-sparsity-of-the-holographic-fringe-pattern-for-a-3d-object
#17
Hak Gu Kim, Hyunwook Jeong, Yong Man Ro
In computer-generated hologram (CGH) calculations, a diffraction pattern needs to be calculated from all points of a 3-D object, which requires a heavy computational cost. In this paper, we propose a novel fast computer-generated hologram calculation method using sparse fast Fourier transform. The proposed method consists of two steps. First, the sparse dominant signals of CGHs are measured by calculating a wavefront on a virtual plane between the object and the CGH plane. Second, the wavefront on CGH plane is calculated by using the measured sparsity with sparse Fresnel diffraction...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27828462/nanoindentation-study-of-optically-patterned-surface-relief-grating-of-azobenzene-polymers
#18
Kang-Han Kim, Yong-Cheol Jeong
We present the light-controlled hierarchical mechanical properties of optically patterned azobenzene thin films through a nanoindentation study. In this study, we inscribed holographic surface relief grating (SRG) of azopolymers by two-beam coupling-based light interference lithography. The resultant morphological profile of azopolymers was monitored by atomic force microscope (AFM), followed by the nanoindentation study. From the load-displacement curve of the indentation procedure, photomechanical changes of the azopolymers along grating patterns were evaluated in terms of hardness and modulus at the crest and trough of the SRG, respectively...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27828440/360-degree-tabletop-electronic-holographic-display
#19
Yongjun Lim, Keehoon Hong, Hwi Kim, Hyun-Eui Kim, Eun-Young Chang, Soohyun Lee, Taeone Kim, Jeho Nam, Hyon-Gon Choo, Jinwoong Kim, Joonku Hahn
We demonstrate a tabletop holographic display system for simultaneously serving continuous parallax 3.2-inch 360-degree three-dimensional holographic image content to multiple observers at a 45-degree oblique viewing circumference. To achieve this, localized viewing windows are to be seamlessly generated on the 360-degree viewing circumference. In the proposed system, four synchronized high-speed digital micro-mirror displays are optically configured to comprise a single 2 by 2 multi-vision panel that enables size enlargement and time-division-multiplexing of holographic image content...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27828347/high-accuracy-method-for-holographic-image-projection-with-suppressed-speckle-noise
#20
Hui Pang, Jiazhou Wang, Axiu Cao, Qiling Deng
Iterative Fourier transform algorithms are widely used for creating holograms in holographic image projection. However, the reconstructed image always suffers from the speckle noise severely due to the uncontrolled phase distribution of the image. In this paper, a new iterative method is proposed to eliminate the speckle noise. In the iteration, the amplitude and phase in the signal window in the output plane are constrained to the desired distribution and a special object-dependent quadratic phase distribution, respectively...
October 3, 2016: Optics Express
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