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Optics Express

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https://www.readbyqxmd.com/read/27906381/video-stabilization-in-atmosphere-turbulent-conditions-based-on-the-laplacian-riesz-pyramid
#1
Bindang Xue, Yi Liu, Linyan Cui, Xiangzhi Bai, Xiaoguang Cao, Fugen Zhou
Video stabilization in atmosphere turbulent conditions is aimed at removing spatiotemporally varying distortions from video recordings. Conventional shaky video stabilization approaches do not perform effectively under turbulent circumstances due to the erratic motion common to those conditions. Using complex-valued image pyramids, we propose a method to mitigate this erratic motion in videos. First, each frame of a video is decomposed into different spatial frequencies using the Laplacian pyramid. Second, a Riesz transform is adopted to extract the local amplitude and the local phase of each sub-band...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906380/efficient-texture-mapping-by-adaptive-mesh-division-in-mesh-based-computer-generated-hologram
#2
Yeong-Min Ji, Hanju- Yeom, Jae-Hyeung Park
We propose a method that achieves efficient texture mapping in fully-analytic computer generated holograms based on triangular meshes. In computer graphics, the texture mapping is commonly used to represent the details of objects without increasing the number of the triangular meshes. In fully-analytic triangular-mesh-based computer generated holograms, however, those methods cannot be directly applied because each mesh cannot have arbitrary amplitude distribution inside the triangular mesh area in order to keep the analytic representation...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906379/vectorial-effect-of-hybrid-polarization-states-on-the-collapse-dynamics-of-a-structured-optical-field
#3
Rui-Pin Chen, Khian-Hooi Chew, Guoquan Zhou, Chao-Qing Dai, Sailing He
The collapse dynamics of a structured optical field with a distribution of spatially-variant states of polarization (SoP) and a spiral phase in the field cross section is studied using the two-dimensional coupled nonlinear Schrӧdinger equations. The self-focusing of a structured optical field with an inhomogeneous SoP distribution can give rise to new phenomena of collapse dynamics that is completely different from a scalar field. The collapse patterns are closely related to the topological charges of the vortexas well as the polarization, the initial power, and the SoP distribution in the field cross section...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906378/cool-white-light-emitting-three-stack-oled-structures-for-amoled-display-applications
#4
Ramon Springer, Byoung Yeop Kang, Raju Lampande, Dae Hyun Ahn, Simone Lenk, Sebastian Reineke, Jang Hyuk Kwon
This paper demonstrates 2-stack and 3-stack white organic light-emitting diodes (WOLEDs) with fluorescent blue and phosphorescent yellow emissive units. The 2-stack and 3-stack WOLED comprises blue-yellow and blue-blue-yellow (blue-yellow-blue) combinations. The position of the yellow emitter and possible cavity lengths in different stack architectures are theoretically and experimentally investigated to reach Commission Internationale de L'Eclairage (CIE) coordinates of near (0.333/0.333). Here, a maximum external quantum efficiency (EQE) of 23...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906377/lock-in-detection-of-photoacoustic-feedback-signal-for-focusing-through-scattering-media-using-wave-front-shaping
#5
Omer Tzang, Rafael Piestun
Wave-front shaping techniques enable focusing and imaging through scattering media. Unfortunately, most approaches require invasive feedback inside or behind the sample, or use of spatial correlations (memory effect) limiting the application to specific types of samples. Recent approaches overcome these limitations by taking advantage of acoustic waves via the photoacoustic (PA) effect or via photon tagging. We present a fully analog signal processing lock-in scheme for PA detection to improve focusing through scattering media and to efficiently extract nonlinear photoacoustic signals towards wave-front optimization...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906376/spin-hall-effect-of-transmitted-light-in-a-three-layer-waveguide-with-lossy-epsilon-near-zero-metamaterial
#6
Tingting Tang, Jie Li, Yanfen Zhang, Chaoyang Li, Li Luo
We study spin Hall effect (SHE) of transmitted light in a three-layer waveguide with epsilon-near-zero (ENZ) metamaterial. As the increased loss of anisotropic ENZ metamaterial brings decreased propagation loss for oblique incidence, the transmission of incident light is enhanced which induces a different distribution of transverse shift peaks. Based on simulation results, the influences of ENZ permittivity components and thickness as well as gold layer thickness on transverse shift of left-circularly polarized light in ENZ/Au/ENZ waveguide are analyzed...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906375/surface-modulation-and-back-reflection-from-foil-targets-irradiated-by-a-petawatt-femtosecond-laser-pulse-at-oblique-incidence
#7
S Ter-Avetisyan, A Andreev, K Platonov, J H Sung, S K Lee, H W Lee, J Y Yoo, P K Singh, H Ahmed, C Scullion, K F Kakolee, T W Jeong, P Hadjisolomou, M Borghesi
A significant level of back reflected laser energy was measured during the interaction of ultra-short, high contrast PW laser pulses with solid targets at 30° incidence. 2D PIC simulations carried out for the experimental conditions show that at the laser-target interface a dynamic regular structure is generated during the interaction, which acts as a grating (quasi-grating) and reflects back a significant amount of incident laser energy. With increasing laser intensity above 10<sup>18</sup> W/cm<sup>2</sup> the back reflected fraction increases due to the growth of the surface modulation to larger amplitudes...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906374/highly-bright-photon-pair-generation-in-doppler-broadened-ladder-type-atomic-system
#8
Yoon-Seok Lee, Sang Min Lee, Heonoh Kim, Han Seb Moon
We report a bright photon-pair source with a coincidence counting rate per input power (cps/mW) of tens of thousands, obtained via spontaneous four-wave mixing from a Doppler-broadened atomic ensemble of the 5S<sub>1/2</sub>-5P<sub>3/2</sub>-5D<sub>5/2</sub> transition of <sup>87</sup>Rb. The photon-pair generation rate is enhanced by the two-photon coherence contributions from almost all the atomic velocity groups in the Doppler-broadened ladder-type atomic system...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906373/efficient-homogeneous-illumination-and-optical-sectioning-for-quantitative-single-molecule-localization-microscopy
#9
Joran Deschamps, Andreas Rowald, Jonas Ries
Single-molecule localization microscopy (SMLM) relies on the switching of fluorescent molecules between a fluorescent and a dark state to achieve super resolution. This process is inherently dependent on the intensity distribution of the laser light used for both activation from the dark state and excitation of the bright state. Typically, laser light is coupled directly or via a single-mode fiber into the microscope, which leads to a Gaussian intensity profile in total internal reflection (TIR) or epi illumination...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906372/depth-based-refocusing-for-reducing-directional-aliasing-artifacts
#10
Ensun Lee, Seohee Yang, Miseon Han, Jeongtae Kim
We investigate a depth-based refocusing method using four-dimensional (4D) light field data, which can reduce directional aliasing artifacts in a refocused image. Unlike conventional filtering-based methods, the proposed method estimates the amount of aliasing artifacts using the disparity information between two neighboring views. It then applies an exact smoothing operation to the refocused image in order to remove the aliasing artifacts. By doing that, the proposed method is able to generate a smoothly blurred image in the out-of-focus region and a sharp image in the focused region...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906371/depolarization-of-a-randomly-distributed-plasmonic-meander-metasurface-characterized-by-mueller-matrix-spectroscopic-ellipsometry
#11
Liwei Fu, Audrey Berrier, Huiyu Li, Philipp Schau, Karsten Frenner, Martin Dressel, Wolfgang Osten
Metallic nanostructures offer efficient solutions in polarization control with a very low thickness. In this report, we investigate the optical properties of a nano-fabricated plasmonic pseudo-depolarizer using Mueller matrix spectroscopic ellipsometry in transmission configuration. The depolarizer is composed of 256 square cells, each containing a periodically corrugated metallic film with random orientation. The full Mueller matrix was analyzed as a function of incident angle in a range between 0 and 20° and over the whole rotation angle range...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906370/optomechanical-oscillator-pumped-and-probed-by-optically-two-isolated-photonic-crystal-cavity-systems
#12
Feng Tian, Hisashi Sumikura, Eiichi Kuramochi, Hideaki Taniyama, Masato Takiguchi, Masaya Notomi
Optomechanical control of on-chip emitters is an important topic related to integrated all-optical circuits. However, there is neither a realization nor a suitable optomechanical structure for this control. The biggest obstacle is that the emission signal can hardly be distinguished from the pump light because of the several orders' power difference. In this study, we designed and experimentally verified an optomechanical oscillation system, in which a lumped mechanical oscillator connected two optically isolated pairs of coupled one-dimensional photonic crystal cavities...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906369/power-coupling-between-gain-guided-index-antiguided-planar-waveguides
#13
Chih-Hsien Lai, Chang-I Hsieh
Power coupling between two gain-guided index-antiguided (GGIAG) planar waveguides is numerically investigated. The strength of coupling is found to vary periodically with the gap between the two waveguide cores, owing to the Fabry-Perot-like behavior of the gap. Moreover, the coupling length at which one waveguide has the minimum power and the coupling length at which another waveguide obtains the maximum power are different. Further investigation reveals that such a difference is attributed to the gain provided in the low-index cores...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906368/euv-scatterometer-with-a-high-harmonic-generation-euv-source
#14
Yi-Sha Ku, Chia-Liang Yeh, Yi-Chang Chen, Chun-Wei Lo, Wei-Ting Wang, Ming-Chang Chen
We have developed an extreme ultraviolet (EUV) scatterometer based on the analysis of coherent EUV light diffracted from a periodic array with nano-scale features. We discuss the choice of appropriate orders of the high harmonics generated coaxially along with the intense Ti:sapphire laser pulses for high resolution spatial performance. We describe an inverse-problem methodology for determining the structural parameters, and present preliminary measurement results confirming the functionality of the scatterometer...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906367/cultivation-of-lemon-fields
#15
Sushanta Kumar Pal, P Senthilkumaran
The sign rule requires that adjacent singularities on a contour have opposite signs and hence cultivation of lemon only fields poses problem as all lemons have positive index. In this paper we show that the interference of three linearly polarized plane waves can create regions of ellipse and vector fields in 2-dimensions (2D) in which a lemon lattice is interlaced in a V-point lattice. The lemons appear at intensity maxima of the lattice structure while the V-points take care of index conservation by sitting at intensity minima...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906366/instantaneous-phase-shifting-deflectometry
#16
Isaac Trumper, Heejoo Choi, Dae Wook Kim
An instantaneous phase shifting deflectometry measurement method is presented and implemented by measuring a time varying deformable mirror with an iPhone <sup>®</sup> 6. The instantaneous method is based on multiplexing phase shifted fringe patterns with color, and decomposing them in x and y using Fourier techniques. Along with experimental data showing the capabilities of the instantaneous deflectometry system, a quantitative comparison with the Fourier transform profilometry method, which is a distinct phase measuring method from the phase shifting approach, is presented...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906365/computation-of-radiation-pressure-force-exerted-on-arbitrary-shaped-homogeneous-particles-by-high-order-bessel-vortex-beams-using-mlfma
#17
Minglin Yang, Yueqian Wu, Kuan Fang Ren, Xinqing Sheng
Due to special characteristics of nondiffraction and self reconstruction, the Bessel beams have attracted wide attention in optical trapping and appear to be a dramatic alternative to Gaussian beams. We present in this paper an efficient approach based on the surface integral equations (SIE) to compute the radiation pressure force (RPF) exerted on arbitrary shaped homogeneous particles by high-order Bessel vortex beam (HOBVB). The incident beam is described by vector expressions perfectly satisfy Maxwell's equations...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906364/time-dependent-laser-linewidth-beat-note-digital-acquisition-and-numerical-analysis
#18
Nicolas Von Bandel, Mikhaël Myara, Mohamed Sellahi, Tahar Souici, Rémi Dardaillon, Philippe Signoret
We revisit and improve the optical heterodyne technique for the measurement of the laser coherence, by digital acquisition of the beat-note and numerical analysis of the resulting signal. Our main result is that with the same experimental setup we reach the very "short-time linewidth" with the highest accuracy as well as the frequency noise spectrum.
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906363/construction-of-the-optical-part-of-a-time-of-flight-detector-prototype-for-the-afp-detector
#19
L Nozka, L Adamczyk, G Avoni, A Brandt, P Buglewicz, E Cavallaro, G Chiodini, L Chytka, K Ciesla, P M Davis, M Dyndal, S Grinstein, P Hamal, M Hrabovsky, K Janas, K Jirakova, M Kocian, T Komarek, K Korcyl, J Lange, D Mandat, V Michalek, I Lopez Paz, D Northacker, M Rijssenbeek, L Seabra, P Schovanek, R Staszewski, P Swierska, T Sykora
We present the construction of the optical part of the ToF (time-of-flight) subdetector prototype for the AFP (ATLAS Forward Proton) detector. The ToF detector in conjunction with a 3D silicon pixel tracker will tag and measure protons originating in central exclusive interactions p + p → p + X + p, where the two outgoing protons are scattered in the very forward directions. The ToF is required to reduce so-called pileup backgrounds that arise from multiple proton interactions in the same bunch crossing at high luminosity...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906362/2-sup-16-sup-shades-of-gray-high-bit-depth-projection-using-light-intensity-control
#20
Jen-Hao Rick Chang, B V K Vijaya Kumar, Aswin C Sankaranarayanan
Projectors create grayscale images by outputting a series of bitplanes or binary images within a short time period. While this technique works well for projecting low bit-depth (8-bit) images, it becomes infeasible for high bit-depth (say, 16-bit) projection - a capability that is increasingly desirable in many applications including cinemas and gaming. Existing designs for high bit-depth projection rely on multiple spatial light modulators and, as a consequence, their costs and complexities are usually far beyond the average consumer...
November 28, 2016: Optics Express
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