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

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https://www.readbyqxmd.com/read/30183017/transmission-of-a-polychromatic-electromagnetic-multi-gaussian-schell-model-beam-in-an-inhomogeneous-gradient-index-fiber
#1
Serkan Sahin, Minghui Zhang, Yahong Chen, Yangjian Cai
We derive analytical expressions for the cross-spectral density matrix of polychromatic electromagnetic multi-Gaussian Schell-model (EMGSM) beam transmission through a gradient-index fiber. The space-spectrum evolution properties for the spectral density, spectral shift, degree of polarization, and electromagnetic coherence state of a polychromatic EMGSM beam with Lorentzian line type spectrum and central wavelength λ0 =1550  nm propagation in a silica-clad germania core inhomogeneous graded-index fiber are studied in detail...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183016/formation-of-high-quality-vortex-laser-beams-with-different-orbital-angular-momenta-in-the-laser-resonator
#2
Liying Zhang, Tao Geng, Xiumin Gao, Songlin Zhuang, Jinling Lian
A scheme for forming high-quality vortex laser beams by employing spiral phase elements inside a laser resonator is presented theoretically. The calculated results show that the purity of the generated mode will decrease slightly as the mode order increases. However, the purity can achieve higher than 0.97 even for the high-order mode. More important, the value of the orbital angular momentum is controllable. Then, the influence of production and alignment errors, including the number of phase levels of the spiral phase elements, the surface roughness of the reflective mirrors, and the decenter of the reflective mirrors, is discussed in detail...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183015/optimized-angular-selective-filtering-of-direct-solar-radiation
#3
Rustam Zakirullin
A method to optimize the angular selective filtering of direct solar radiation by minimization of light transmission of a window at a preset date and time of day, taking into account the orientation of the window to the cardinal, the latitude of the building, and the seasonal and daily distribution of solar radiation intensity, is described. Optimization is carried out using an optical filter with two thin-film surface gratings with alternating transmissive and non-transmissive parallel strips. The optimal slope angle of the strips to horizontal, the widths of the strips, the shift of input and output gratings relative to each other, and the angular characteristics of light transmittance are calculated...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183014/focal-shift-in-tightly-focused-hybridly-polarized-laguerre-gaussian-vector-beams-with-zero-radial-index
#4
Yi Chen, Sujuan Huang, Musheng Chen, Xianpeng Liu
Hybridly polarized Laguerre-Gaussian vector beams (HPLGVBs) with zero radial index are obtained based on the third type of Laguerre-Gaussian vector beams. Polarization distributions of HPLGVBs are controlled by the phase retardation of a wave plate. The ellipticity angle and polarization orientation angle are used to describe the polarization distributions of the HPLGVBs. The electric field intensity distributions of tightly focused HPLGVBs are analyzed in the focal plane by the Richards-Wolf vectorial diffraction method...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183013/optical-image-processing-with-metasurface-dark-modes
#5
Ann Roberts, Daniel E Gómez, Timothy J Davis
Here we consider image processing using the optical modes of metasurfaces with an angle-dependent excitation. These spatially dispersive modes can be used to directly manipulate the spatial frequency content of an incident field, suggesting their use as ultra-compact alternatives for analog optical information processing. A general framework for describing the filtering process in terms of the optical transfer functions is provided. In the case where the relevant mode cannot be excited with a normally incident plane wave (a dark mode), high-pass filtering is obtained...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183012/hybrid-camera-array-based-calibration-for-computer-generated-integral-photography-display
#6
Guowen Chen, Hanpeng Wang, Mengfei Liu, Hongen Liao
Integral photography (IP) is one of the most promising 3D displays that can achieve a full parallax 3D display without glasses. There is a great need to render a correct, high-precision 3D image from an IP display. To achieve a correct 3D display, calibration is needed to correct optical misalignment and optical aberrations, while it is challenging to achieve correct mapping between a microlens array and matrix display. We propose an IP calibration method for a 3D autostereoscopic integral photography display based on a sparse camera array...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183011/m-pulse-amplitude-modulation-of-a-flat-topped-beam-for-aeronautical-laser-communications
#7
Hamza Gerçekcioğlu
Using the Rytov method, bit error rate (BER) performances of M-pulse amplitude modulation (M-PAM) are investigated for a flat-topped beam when such a beam is employed in an aeronautical laser communication system operating in vertical paths having weak atmospheric turbulence. By using the on-axis scintillation index and the log-normal distributed intensity, the average BER (⟨BER⟩) is evaluated for M-PAM when M=2,4,8. The scintillation indices of collimated flat-topped beams of various flatness orders N are compared against propagation lengths, source sizes, and zenith angle for laser communication vertical paths, including uplink and downlink...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183010/plane-wave-scattering-by-an-ellipsoid-composed-of-an-orthorhombic-dielectric-magnetic-material
#8
Hamad M Alkhoori, Akhlesh Lakhtakia, James K Breakall, Craig F Bohren
The extended boundary condition method can be used to study plane-wave scattering by an ellipsoid composed of an orthorhombic dielectric-magnetic material whose relative permittivity dyadic is a scalar multiple of its relative permeability dyadic. The scattered and internal field phasors can be expanded in terms of appropriate vector spherical wavefunctions with unknown expansion coefficients, whereas the incident-field phasors can be similarly expanded but with known expansion coefficients. The scattered-field coefficients are related to the incident-field coefficients through a matrix...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183009/direct-detection-receiver-for-vortex-beam
#9
Judy Kupferman, Shlomi Arnon
We present the theory of a direct detection receiver for vortex beams for an optical wireless communication system. The proposed receiver has an array of annular detectors, which enables analysis of power distribution of the vortex beam. We give a detailed description, numerical optimization, and different options for its design. One possible application of this receiver could be high security communication systems, and another could be intra data center communication. Using a given set of parameters, we find that a seven-ring symmetrically spaced detector is comparable to a three-ring detector with an optimized ring area...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183008/spatio-spectral-binary-patterns-based-on-multispectral-filter-arrays-for-texture-classification
#10
Sofiane Mihoubi, Olivier Losson, Benjamin Mathon, Ludovic Macaire
To discriminate gray-level texture images, spatial texture descriptors can be extracted using the local binary pattern (LBP) operator. This operator has been extended to color images at the expense of increased memory and computation requirements. Some authors propose to compute texture descriptors directly from raw images provided through a Bayer color filter array, which both avoids the demosaicking step and reduces the descriptor size. Recently, multispectral snapshot cameras have emerged to sample more than three wavelength bands using a multispectral filter array...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183007/generalized-parabolic-nondiffracting-beams-of-two-orders
#11
Svetlana N Khonina, Andrey V Ustinov, Sabino Chávez-Cerda
In this paper we consider a generalization of standard nondiffracting parabolic beams. The proposed generalized beams have two orders: a continuous parameter a, as in standard beams, and the new parameter is an integer index m. Physically, the last parameter is equal to the number of rotated repetitions of the structure of the original angular spectrum on the total circle in the frequency space. Theoretical investigation shows that for a=0 the beams are real functions and have a symmetry of order 2m. If a≠0 the beams will be real functions only for odd values of m...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183006/reflection-and-refraction-problems-for-metasurfaces-related-to-monge-amp%C3%A3-re-equations
#12
Cristian E Gutiérrez, Luca Pallucchini
A metasurface is a surface, typically a plane, on which a function called phase discontinuity is chosen so that the metasurface produces a desired reflection or refraction job. We derive the equations that the phase discontinuity function must satisfy, i.e., Monge-Ampère partial differential equations, and we prove the existence of solutions.
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183005/degree-of-polarization-in-the-focal-region-of-a-lens
#13
Xinying Zhao, Taco D Visser, Govind P Agrawal
We examine the 3D distribution of the degree of polarization (DOP) in the focal region of a thin paraxial lens. Analytic expressions for the case of a focused Gaussian-Schell model beam are derived. These show that the DOP satisfies certain spatial symmetry relations. Furthermore, its value varies strongly in the vicinity of the geometrical focus, and its maximum, which need not occur at the focus, can be significantly higher than that of the incident beam.
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183004/scattering-of-a-laguerre-gaussian-beam-by-complicated-shaped-biological-cells
#14
Meiping Yu, Yiping Han, Zhiwei Cui, Haoyu Sun
In this paper, we generalize the method of moments (MOM) based on the surface integral equation (SIE) method to investigate the scattering properties of complicated shaped biological cells illuminated by a Laguerre-Gaussian beam (LGB). We introduce the Lorentz-gauge vector potential with slowly varying envelope amplitude which satisfies the paraxial wave equation to obtain the electric and magnetic field components of the incident beam. The SIE method is applied to compute the scattering field of arbitrary shaped biological cells, the MLFMA is utilized to efficiently solve the resulting matrix equations, and a home-made FORTRAN program is written...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183003/theoretical-investigations-of-infrared-optical-wave-modulation-transfer-function-models-in-anisotropic-marine-turbulence
#15
Linyan Cui, Wen Fei, Bindang Xue
The previously derived marine turbulence modulation transfer function (MTF) adopts the classical assumption of isotropic and Kolmogorov turbulence. However, more theoretical research shows that marine turbulence demonstrates anisotropic non-Kolmogorov properties. In this study, new long-exposure plane and spherical wave MTF models under anisotropic non-Kolmogorov marine turbulence will be investigated. Comparative analyses are performed for the new models and the existing ones that have been developed under the isotropic marine turbulence and the anisotropic terrestrial turbulence cases...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183002/near-infrared-polarimetric-imaging-and-changes-associated-with-normative-aging
#16
Joel A Papay, Ann E Elsner
With aging, the human retina undergoes cell death and additional structural changes that can increase scattered light. We quantified the effect of normative aging on multiply scattered light returning from the human fundus. As expected, there was an increase of multiply scattered light associated with aging, and this is consistent with the histological changes that occur in the fundus of individuals before developing age-related macular degeneration. This increase in scattered light with aging cannot be attributed to retinal reflectivity, anterior segment scatter, or pupil diameter...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183001/disparity-selective-stereo-matching-using-correlation-confidence-measure
#17
Sijung Kim, Jinbeum Jang, Jaeseung Lim, Joonki Paik, Sangkeun Lee
Recently, the cost-volume filtering (CVF) methods for local stereo matching have provided fast and accurate results compared to those of the other method. However, CVF still causes incorrect results in the occlusion and texture-free regions. In particular, cost aggregation by pixel units involves complex computation because of its dependence on the image resolution and search range. This paper presents a robust stereo matching method for occluded regions. First, we generate cost volumes using the CENSUS transform and the scale-invariant feature transform (SIFT)...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30183000/three-dimensional-localized-chirped-airy-circular-wave-packets-in-free-space
#18
Guanwen Zhao, Shijie Chen, Zhengzhong Huang, Dongmei Deng
By solving the (3+1)-dimensional free-space Schrödinger equation in circular cylindrical coordinates, we have systematically analyzed the propagation of chirped Airy-circular (CAiCi) wave packets. The complex amplitude of the CAiCi wave packets is constructed by the Airy function, the Gaussian function, and the confluent hypergeometric function. We find that the CAiCi wave packets are some coaxial ring pulses stacked along the temporal domain in the initial position, which are modulated by the chirped factor, the initial velocity, the distribution factor, and the propagation distance...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30182999/solving-analytically-the-simplified-spherical-harmonics-equations-in-cylindrical-turbid-media
#19
Ehsan Edjlali, Yves Bérubé-Lauzière
A methodology is presented for analytically solving simplified spherical harmonics equations (SPN ) in a finite homogeneous absorbing and scattering cylindrical medium. The SPN equations are a reliable approximation to the radiative transfer equation for describing light propagation inside turbid media. The equations consist of a set of coupled partial differential equations (PDEs). The analytical solution developed here is for a steady-state isotropic point source located at an arbitrary point inside a cylindrical turbid medium...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/30182998/bit-error-rate-of-pulse-position-modulated-optical-wireless-communication-links-in-oceanic-turbulence
#20
Yahya Baykal
The upper bound of the average bit error rate (BER) of a pulse position modulated (PPM) optical wireless communication (OWC) link operating in oceanic turbulence is formulated. BER variations against the changes in the ratio of temperature to salinity contributions to the refractive index spectrum, the rate of dissipation of mean-squared temperature, and the rate of dissipation of kinetic energy per unit mass of fluid are found at various data bit rates, average current gains of the avalanche photodiode (APD), and M values of the M-ary PPM...
September 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
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