journal
MENU ▼
Read by QxMD icon Read
search

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

journal
https://www.readbyqxmd.com/read/29877349/degree-of-paraxiality-of-an-anisotropic-generalized-multi-gaussian-schell-model-beam
#1
Li Zhu, Zhenfei Jiang, Ke Cheng, Tao Wang
The degree of paraxiality of an anisotropic generalized multi-Gaussian Schell-model (GMGSM) beam is discussed and shown to be affected by the anisotropy and boundary characteristics of the source. Numerical results are presented to show the influence of these factors.
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877348/two-photon-speckle-illumination-for-super-resolution-microscopy
#2
Awoke Negash, Simon Labouesse, Patrick C Chaumet, Kamal Belkebir, Hugues Giovannini, Marc Allain, Jérôme Idier, Anne Sentenac
We present a numerical study of a microscopy setup in which the sample is illuminated with uncontrolled speckle patterns and the two-photon excitation fluorescence is collected on a camera. We show that, using a simple deconvolution algorithm for processing the speckle low-resolution images, this wide-field imaging technique exhibits resolution significantly better than that of two-photon excitation scanning microscopy or one-photon excitation bright-field microscopy.
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877347/are-bessel-beams-resilient-to-aberrations-and-turbulence
#3
Nokwazi Mphuthi, Roelf Botha, Andrew Forbes
It is understood from the conical wave picture that Bessel beams may self-heal after certain opaque obstructions, but the extrapolation to transparent phase screens is not self-evident. Here we consider the propagation of Bessel beams through aberrated obstacles and show that the self-healing is not guaranteed, but rather a function of the severity of the aberration. Paradoxically, we explain why strong aberrations may show self-healing while weak aberrations will not, and highlight the parameters that influence this...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877346/focusing-properties-of-arbitrary-optical-fields-combining-spiral-phase-and-cylindrically-symmetric-state-of-polarization
#4
Zhongsheng Man, Zhidong Bai, Shuoshuo Zhang, Jinjian Li, Xiaoyu Li, Xiaolu Ge, Yuquan Zhang, Shenggui Fu
The tight focusing properties of optical fields combining a spiral phase and cylindrically symmetric state of polarization are presented. First, we theoretically analyze the mathematical characterization, Stokes parameters, and Poincaré sphere representations of arbitrary cylindrical vector (CV) vortex beams. Then, based on the vector diffraction theory, we derive and build an integrated analytical model to calculate the electromagnetic field and Poynting vector distributions of the input CV vortex beams. The calculations reveal that a generalized CV vortex beam can generate a sharper focal spot than that of a radially polarized (RP) plane beam in the focal plane...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877345/nondestructive-fast-and-cost-effective-image-processing-method-for-roughness-measurement-of-randomly-rough-metallic-surfaces
#5
Sajjad Ghodrati, Saeideh Gorji Kandi, Mohsen Mohseni
In recent years, various surface roughness measurement methods have been proposed as alternatives to the commonly used stylus profilometry, which is a low-speed, destructive, expensive but precise method. In this study, a novel method, called "image profilometry," has been introduced for nondestructive, fast, and low-cost surface roughness measurement of randomly rough metallic samples based on image processing and machine vision. The impacts of influential parameters such as image resolution and filtering approach for elimination of the long wavelength surface undulations on the accuracy of the image profilometry results have been comprehensively investigated...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877344/refractive-index-sensor-with-high-sensitivity-based-on-circular-photonic-crystal
#6
Rui Ge, Jianlan Xie, Bei Yan, Exian Liu, Wei Tan, Jianjun Liu
A highly sensitive refractive index sensor is proposed that consists of a silicon ring surrounding a cavity in a circular photonic crystal (CPC). The bandgap of the CPC is determined from the transmission spectra. Relationships between the performance parameters and the structure parameters of the sensor are investigated. Transmission spectra of the optimized sensor filled with different analytes are analyzed, and a sensitivity of 1054 nm/RIU (refractive index units) and a quality factor of 18,206 are obtained...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877343/tighter-focus-for-ultrashort-pulse-vector-light-beams-change-of-the-relative-contribution-of-different-field-components-to-the-focal-spot-upon-pulse-shortening
#7
Svetlana N Khonina, Ilya Golub
We investigate the focusing of Poisson-spectrum few cycle pulsed light beams for linear, circular, azimuthal, and radial input polarizations with and without a first-order vortex. It is shown that, for all the considered cases, the focal spot is tighter when compared to long pulses due to the increased blue frequency content in the ultrashort pulses spectrum. More significantly, we show, for what we believe is the first time, that upon pulse shortening different focused beam vector components associated with different Bessel functions J0 and J1 undergo a change in the relative weight of their respective contribution to the focal spot size...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877342/precision-of-polarimetric-orthogonal-state-contrast-estimation-in-coherent-images-corrupted-by-speckle-poisson-and-additive-noise
#8
Jan Dupont, Matthieu Boffety, François Goudail
We consider laser-illuminated active polarimetric imaging systems that measure the orthogonal state contrast (OSC), a frequently used surrogate to the degree of polarization, that can be used, for example, to discriminate manmade objects from natural backgrounds in remote sensing. We investigate the estimation precision of the OSC parameter in the presence of speckle, Poisson, and additive noise by using the Cramer-Rao lower bound (CRLB). Using Monte Carlo simulations and optical experiments, we show that the expression of the CRLB models the actual OSC estimation performance with excellent accuracy...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877341/rgb-to-rgbg-conversion-algorithm-with-adaptive-weighting-factors-based-on-edge-detection-and-minimal-square-error
#9
Chengqiang Huang, Youchang Yang, Bo Wu, Weize Yu
The sub-pixel arrangement of the RGBG panel and the image with RGB format are different and the algorithm that converts RGB to RGBG is urgently needed to display an image with RGB arrangement on the RGBG panel. However, the information loss is still large although color fringing artifacts are weakened in the published papers that study this conversion. In this paper, an RGB-to-RGBG conversion algorithm with adaptive weighting factors based on edge detection and minimal square error (EDMSE) is proposed. The main points of innovation include the following: (1) the edge detection is first proposed to distinguish image details with serious color fringing artifacts and image details which are prone to be lost in the process of RGB-RGBG conversion; (2) for image details with serious color fringing artifacts, the weighting factor 0...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877340/on-the-inverse-problem-of-source-reconstruction-from-coherence-measurements
#10
Andre Beckus, Alexandru Tamasan, Aristide Dogariu, Ayman F Abouraddy, George K Atia
We consider an inverse source problem for partially coherent light propagating in the Fresnel regime. The data are the coherence of the field measured away from the source. The reconstruction is based on a minimum residue formulation, which uses the authors' recent closed-form approximation formula for the coherence of the propagated field. The developed algorithms require a small data sample for convergence and yield stable inversion by exploiting information in the coherence as opposed to intensity-only measurements...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877339/focus-shaping-and-optical-manipulation-using-highly-focused-second-order-full-poincar%C3%A3-beam
#11
Yuxiong Xue, Yusong Wang, Sichao Zhou, Hongwei Chen, Guanghao Rui, Bing Gu, Qiwen Zhan
Generation of vectorial optical fields with arbitrary polarization distribution is of great interest in plenty of applications. In this work, we propose and experimentally demonstrate the generation of a second-order full Poincaré (FP) beam and its application in two-dimensional (2D) flattop beam shaping with spatially variant polarization under a high numerical aperture focusing condition. In addition, the force mechanism of the focal field with 2D flattop beam profile is numerically studied, demonstrating the feasibility to trap a dielectric Rayleigh particle in three-dimensional space...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877338/computational-simulation-of-haidinger-s-brushes
#12
Gary P Misson, Shelby E Temple, Stephen J Anderson
Haidinger's brushes (HB) are entoptic phenomena resulting from differential absorption of linear polarized light by the human macula. Computational models have assisted in understanding the behavior of these subjective phenomena but have been limited in their application. This study presents a revised computational model that incorporates known determinants of the form and behavior of HB. The model generates both static and animated simulations of HB that can be quantified by their density, contrast, and radial/circumferential extent...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877337/approach-for-sequential-image-interpretation-using-a-priori-binary-perceptual-topological-and-photometric-knowledge-and-k-means-based-segmentation
#13
Jean-Baptiste Fasquel, Nicolas Delanoue
The proposed approach exploits a priori known qualitative inclusion and photometric relationships between image regions, represented by oriented graphs. Our work assumes a sequential image segmentation procedure where regions are progressively segmented and recognized by associating them with corresponding nodes in graphs related to the prior knowledge. The main contribution concerns the parameterization of the k-means clustering algorithm, to be used during the segmentation procedure, and the graph-matching-based identification of resulting clusters, corresponding to regions declared in graphs...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877336/predictive-dynamic-digital-holography-and-image-sharpening
#14
Sennan Sulaiman, Steve Gibson, Mark Spencer
Digital holography is often combined with image sharpening for wavefront estimation and correction, and this combination has received recent attention for many imaging and sensing applications. A significant obstacle for digital holography and image sharpening in high-speed real-time applications is the fact that the process is computationally intensive, requiring iterative virtual wavefront propagation and hill-climbing algorithms to optimize sharpness criteria. This paper introduces a method for accelerating dynamic digital holography and image sharpening by wavefront prediction...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877335/analysis-of-the-yule-nielsen-effect-with-the-multiple-path-point-spread-function-in-a-frequency-modulated-halftone
#15
Geoffrey Rogers
The Yule-Nielsen effect is an influence on halftone color caused by the diffusion of light within the paper upon which the halftone ink is printed. The diffusion can be characterized by a point spread function. In this paper, a point spread function for paper is derived using the multiple-path model of reflection. This model treats the interaction of light with turbid media as a random walk. Using the multiple-path point spread function, a general expression is derived for the average reflectance of light from a frequency-modulated halftone, in which dot size is constant and the number of dots is varied, with the arrangement of dots random...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877334/lens-magnification-affects-the-estimates-of-refractive-error-obtained-using-eccentric-infrared-photorefraction
#16
Shrikant R Bharadwaj, Praveen K Bandela, Vinay Kumar Nilagiri
Positive- and negative-powered ophthalmic lenses are used in eccentric infrared photorefraction to calibrate the device, correct the subject's baseline refractive error before an experimental manipulation, or stimulate blur-driven accommodation. Through theoretical modeling of luminance gradients formed across the pupil and empirical measurements of the eye's refractive error using a commercial photorefractor, this study shows that image magnification by positive lenses and image minification by negative lenses under- and overestimates the refractive error, respectively, all independent of image defocus...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877333/trapping-two-types-of-particles-by-using-a-tightly-focused-radially-polarized-power-exponent-phase-vortex-beam
#17
Chengjin Fan, Yongxin Liu, Xiaoyan Wang, Ziyang Chen, Jixiong Pu
We investigate the intensity of a radially polarized power-exponent-phase vortex (PEPV) beam focused by a high-numerical-aperture objective. A bright focal spot and a focal annulus with a dark core can be generated by changing the phase of the PEPV beam. The possibility of trapping a gold particle with the bright focal spot and trapping an air bubble with the focal annulus is discussed, and the force and trapping stability are calculated. It is shown that a tightly focused radially polarized PEPV beam is applicable to trapping two types of particles...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877332/generalized-time-independent-correlation-transport-equation-with-static-background-influence-of-anomalous-transport-on-the-field-autocorrelation-function
#18
Tiziano Binzoni, Fabrizio Martelli, Tomasz J Kozubowski
A generalized time-independent correlation transport equation (GCTE) is proposed for the field autocorrelation function. The GCTE generalizes various models for anomalous transport of photons and takes into account the possible presence of a static background. In a tutorial example, the GCTE is solved for a homogeneous semi-infinite medium in reflectance configuration through Monte Carlo simulations. The chosen anomalous photon transport model also includes the classic and the "generalized" Lambert-Beer's law (depending on the choice of parameters)...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877331/abruptly-autofocusing-property-of-circular-airy-vortex-beams-with-different-initial-launch-angles
#19
Yunfeng Jiang, Shuofeng Zhao, Wenlei Yu, Xiuwei Zhu
Controlling the trajectory of circular Airy beams (CABs) by negative launch angles would greatly reduce their abruptly autofocusing property. By numerically simulating the propagation of a circular Airy vortex beam with different initial launch angles, we demonstrate in this paper that a larger topological charge of optical vortex (OV) is quite helpful to enhance the abruptly autofocusing property under different launch angles (especially for negative launch angles), without affecting the focal position and trajectory...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29877330/semianalytical-model-for-the-electromagnetic-enhancement-by-a-rectangular-nanowire-optical-antenna-on-metallic-substrate
#20
Jianing Wan, Junda Zhu, Ying Zhong, Haitao Liu
The electromagnetic enhancement by a metallic nanowire optical antenna on metallic substrate is investigated theoretically. By considering the excitation and multiple scattering of surface plasmon polaritons in the nanogap between the antenna and the substrate, we build up an intuitive and comprehensive model that provides semianalytical expressions for the electromagnetic field in the nanogap to achieve an understanding of the mechanism of electromagnetic enhancement. Our results show that antennas with short lengths that support the lowest order of resonance can achieve a high electric-field enhancement factor over a large range of incidence angles...
June 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
journal
journal
32911
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"