627 results match your criteria Journal of the Optical Society of America A: Optics Image Science & Vision [Journal]


What is a troland?

J Opt Soc Am A Opt Image Sci Vis 2018 May;35(5):813-816

Trolands are a widely used measure of retinal illuminance in vision science and visual optics, but disagreements exist for the definition and interpretation of this photometric unit. The purpose of this communication is to resolve the confusion by providing a sound conceptual basis for interpreting trolands as a measure of angular flux density incident upon the retina. Using a simplified optical analysis, we show that the troland value of an extended source is the intensity in micro-candelas of an equivalent point source located at the eye's posterior nodal point that produces the same illuminance in the retinal image as does the extended source. Read More

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https://www.osapublishing.org/abstract.cfm?URI=josaa-35-5-81
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http://dx.doi.org/10.1364/JOSAA.35.000813DOI Listing
May 2018
7 Reads

Efficient, nonlinear phase estimation with the nonmodulated pyramid wavefront sensor.

Authors:
Richard A Frazin

J Opt Soc Am A Opt Image Sci Vis 2018 Apr;35(4):594-607

The sensitivity of the pyramid wavefront sensor (PyWFS) has made it a popular choice for astronomical adaptive optics (AAO) systems. The PyWFS is at its most sensitive when it is used without modulation of the input beam. In nonmodulated mode, the device is highly nonlinear. Read More

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http://dx.doi.org/10.1364/JOSAA.35.000594DOI Listing
April 2018
1 Read

Modeling astronomical adaptive optics performance with temporally filtered Wiener reconstruction of slope data.

J Opt Soc Am A Opt Image Sci Vis 2017 Oct;34(10):1877-1887

We build on a long-standing tradition in astronomical adaptive optics (AO) of specifying performance metrics and error budgets using linear systems modeling in the spatial-frequency domain. Our goal is to provide a comprehensive tool for the calculation of error budgets in terms of residual temporally filtered phase power spectral densities and variances. In addition, the fast simulation of AO-corrected point spread functions (PSFs) provided by this method can be used as inputs for simulations of science observations with next-generation instruments and telescopes, in particular to predict post-coronagraphic contrast improvements for planet finder systems. Read More

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https://www.osapublishing.org/abstract.cfm?URI=josaa-34-10-1
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http://dx.doi.org/10.1364/JOSAA.34.001877DOI Listing
October 2017
4 Reads

Stokes-vector and Mueller-matrix polarimetry [Invited].

Authors:
R M A Azzam

J Opt Soc Am A Opt Image Sci Vis 2016 Jul;33(7):1396-408

This paper reviews the current status of instruments for measuring the full 4×1 Stokes vector S, which describes the state of polarization (SOP) of totally or partially polarized light, and the 4×4 Mueller matrix M, which determines how the SOP is transformed as light interacts with a material sample or an optical element or system. The principle of operation of each instrument is briefly explained by using the Stokes-Mueller calculus. The development of fast, automated, imaging, and spectroscopic instruments over the last 50 years has greatly expanded the range of applications of optical polarimetry and ellipsometry in almost every branch of science and technology. Read More

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http://dx.doi.org/10.1364/JOSAA.33.001396DOI Listing
July 2016
1 Read

Statistical framework for the utilization of simultaneous pupil plane and focal plane telemetry for exoplanet imaging. I. Accounting for aberrations in multiple planes.

Authors:
Richard A Frazin

J Opt Soc Am A Opt Image Sci Vis 2016 04;33(4):712-25

A new generation of telescopes with mirror diameters of 20 m or more, called extremely large telescopes (ELTs), has the potential to provide unprecedented imaging and spectroscopy of exoplanetary systems, if the difficulties in achieving the extremely high dynamic range required to differentiate the planetary signal from the star can be overcome to a sufficient degree. Fully utilizing the potential of ELTs for exoplanet imaging will likely require simultaneous and self-consistent determination of both the planetary image and the unknown aberrations in multiple planes of the optical system, using statistical inference based on the wavefront sensor and science camera data streams. This approach promises to overcome the most important systematic errors inherent in the various schemes based on differential imaging, such as angular differential imaging and spectral differential imaging. Read More

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http://dx.doi.org/10.1364/JOSAA.33.000712DOI Listing
April 2016
1 Read

Fast high-order perturbation of surfaces methods for simulation of multilayer plasmonic devices and metamaterials.

J Opt Soc Am A Opt Image Sci Vis 2014 Aug;31(8):1820-31

The scattering of time-harmonic linear waves by periodic media arises in a wide array of applications from materials science and nondestructive testing to remote sensing and oceanography. In this work we have in mind applications in optics, more specifically plasmonics, and the surface plasmon polaritons that are at the heart of remarkable phenomena such as extraordinary optical transmission, surface-enhanced Raman scattering, and surface plasmon resonance biosensing. In this paper we develop robust, highly accurate, and extremely rapid numerical solvers for approximating solutions to grating scattering problems in the frequency regime where these are commonly used. Read More

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http://dx.doi.org/10.1364/JOSAA.31.001820DOI Listing

Static and predictive tomographic reconstruction for wide-field multi-object adaptive optics systems.

J Opt Soc Am A Opt Image Sci Vis 2014 Jan;31(1):101-13

Multi-object adaptive optics (MOAO) systems are still in their infancy: their complex optical designs for tomographic, wide-field wavefront sensing, coupled with open-loop (OL) correction, make their calibration a challenge. The correction of a discrete number of specific directions in the field allows for streamlined application of a general class of spatio-angular algorithms, initially proposed in Whiteley et al. [J. Read More

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http://dx.doi.org/10.1364/JOSAA.31.000101DOI Listing
January 2014

Optical transfer function of the supersonic mixing layer.

J Opt Soc Am A Opt Image Sci Vis 2012 Dec;29(12):2628-37

College of Photon-electron Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China.

The optical path difference (OPD) of the supersonic mixing layer with convective Mach number 0.5 is measured using the nanoparticle-based planar laser scattering technique, and its short-exposure optical transfer function (OTF) is computed with the proper orthogonal decomposition (POD). The OPD is analyzed from the viewpoint of structure function, and remarkable power law behavior is found. Read More

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http://dx.doi.org/10.1364/JOSAA.29.002628DOI Listing
December 2012

Empirical model for target depth estimation used in the time-domain subsurface imaging.

J Opt Soc Am A Opt Image Sci Vis 2012 Oct;29(10):2174-80

Laboratory for Media Technology, Swiss Federal Laboratories for Materials Science and Technology (EMPA), 8600 Dübendorf, Switzerland.

Monte Carlo simulations were performed in order to obtain reflectance measurements from phantoms typically used in biomedical optics when either unpolarized or circularly polarized incident light is used. Phantoms contain spherical targets of different diameters, placed at different depths, with higher absorption than the surrounding medium, which are detected using a coaxial setup of laser and detector. The considered turbid media have highly anisotropic scattering phase functions, so detected light for the considered times of flight is not diffuse, but rather in the multiple-scattering regime. Read More

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http://dx.doi.org/10.1364/JOSAA.29.002174DOI Listing
October 2012

Generalized laws of refraction that can lead to wave-optically forbidden light-ray fields.

J Opt Soc Am A Opt Image Sci Vis 2012 Jul;29(7):1407-11

SUPA, School of Physics & Astronomy, University of Glasgow, Glasgow, UK.

The recent demonstration of a metamaterial phase hologram so thin that it can be classified as an interface in the effective-medium approximation [Science 334, 333 (2011)] has dramatically increased interest in generalized laws of refraction. Based on the fact that scalar wave optics allows only certain light-ray fields, we divide generalized laws of refraction into two categories. When applied to a planar cross section through any allowed light-ray field, the laws in the first category always result in a cross section through an allowed light-ray field again, whereas the laws in the second category can result in a cross section through a forbidden light-ray field. Read More

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http://dx.doi.org/10.1364/JOSAA.29.001407DOI Listing

High-efficiency x-ray gratings with asymmetric-cut multilayers.

J Opt Soc Am A Opt Image Sci Vis 2012 Mar;29(3):216-30

Photon Science, DESY, Hamburg, Germany.

We present the fabrication and analysis of efficient and highly dispersive gratings for the x-ray and extreme ultraviolet (EUV) regime. We show that an asymmetric-cut multilayer structure can act as a near-perfect blazed grating. The precision and high line density are achieved by layer deposition of materials, which can be controlled to the angstrom level. Read More

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http://dx.doi.org/10.1364/JOSAA.29.000216DOI Listing
March 2012
48 Reads

The Farnsworth Flashlight is not equivalent to the Farnsworth Lantern.

Authors:
Stephen Dain

J Opt Soc Am A Opt Image Sci Vis 2012 Feb;29(2):A377-82

Optics and Radiometry Laboratory, School of Optometry and Vision Science, University of New South Wales, Sydney, NSW 2052, Australia.

The Farnsworth Lantern has been accepted in many occupational applications. Modern instruments purporting to be equivalent were inevitable given the ubiquity of its use. The OPTEC900® (Stereo Optical) has been validated and adopted as an acceptable substitute, although the fail rate is slightly higher. Read More

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https://www.osapublishing.org/abstract.cfm?URI=josaa-29-2-A3
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http://dx.doi.org/10.1364/JOSAA.29.00A377DOI Listing
February 2012
1 Read

Do color appearance judgments interfere with detection of small threshold stimuli?

J Opt Soc Am A Opt Image Sci Vis 2012 Feb;29(2):A258-67

University of Houston, College of Optometry, 4901 Calhoun Rd., Houston, Texas 77204, USA.

The application of adaptive optics to vision science creates the potential to directly probe the link between the retinal mosaic and visual perception. However, interrogation on a cellular level requires small, threshold stimuli and therefore an implicit detection model. Unfortunately the parameters governing detection at cone threshold are poorly constrained, and whether or not appearance judgments interact with detectability under these conditions is unknown. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3671591PMC
http://dx.doi.org/10.1364/JOSAA.29.00A258DOI Listing
February 2012
1 Read

Reflection and transmission of normally incident full-vector X waves on planar interfaces.

J Opt Soc Am A Opt Image Sci Vis 2012 Jan;29(1):139-52

Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.

The reflection and transmission of full-vector X waves normally incident on planar half-spaces and slabs are studied. For this purpose, X waves are expanded in terms of weighted vector Bessel beams; this new decomposition and reconstruction method offers a more lucid and intuitive interpretation of the physical phenomena observed upon the reflection or transmission of X waves when compared to the conventional plane-wave decomposition technique. Using the Bessel beam expansion approach, we have characterized changes in the field shape and the intensity distribution of the transmitted and reflected full-vector X waves. Read More

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http://dx.doi.org/10.1364/JOSAA.29.000139DOI Listing
January 2012
1.560 Impact Factor

Convergence analysis and oscillations in the method of fictitious sources applied to dielectric scattering problems.

J Opt Soc Am A Opt Image Sci Vis 2012 Jan;29(1):1-10

Department of Radio Science and Engineering, School of Electrical Engineering, Aalto University, Espoo, Finland.

Several wave scattering phenomena in optics are modeled by the method of fictitious sources (MFS). Despite its interesting features, the effectiveness of the MFS and its applicability are restricted by open issues, including the placement of the fictitious sources (FS) and the fields' convergence. Concerning these issues, we investigate here the MFS convergence and study oscillations in its solutions for a representative scattering problem of a dielectric cylinder illuminated by a current filament. Read More

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http://dx.doi.org/10.1364/JOSAA.29.000001DOI Listing
January 2012
2 Reads

Scaling law for computational imaging using spherical optics.

J Opt Soc Am A Opt Image Sci Vis 2011 Dec;28(12):2540-53

Computer Science Department, Columbia University, New York, New York 10027, USA.

The resolution of a camera system determines the fidelity of visual features in captured images. Higher resolution implies greater fidelity and, thus, greater accuracy when performing automated vision tasks, such as object detection, recognition, and tracking. However, the resolution of any camera is fundamentally limited by geometric aberrations. Read More

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http://dx.doi.org/10.1364/JOSAA.28.002540DOI Listing
December 2011
2 Reads

Subwavelength imaging by a graded-index photonic-crystal flat lens in a honeycomb lattice.

J Opt Soc Am A Opt Image Sci Vis 2011 Oct;28(10):2171-5

Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, China.

The left-handed behavior of a photonic-crystal flat lens with a graded index in a honeycomb lattice is proposed and theoretically studied. The performance of the flat superlens imaging of this structure has been demonstrated by finite-difference time-domain simulations. The full width at half-maximum of the image decreases to 62% compared to that of the image of a photonic-crystal slab without a graded index. Read More

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http://dx.doi.org/10.1364/JOSAA.28.002171DOI Listing
October 2011
1 Read

Effects of symmetry breaking on plasmon resonance in a noncoaxial nanotube and nanotube dimer.

J Opt Soc Am A Opt Image Sci Vis 2011 Aug;28(8):1662-7

College of Physics Science and Technology, Central South University, Changsha 410083, China.

The effects of symmetry breaking on plasmonic properties of one nanotube and three types of nanotube dimers are numerically investigated. It is found that increasing the coaxial offset can result in redshifting of the transmission spectra and the existence of more peaks in the nanoegglike structures, while the nanocuplike structures present the opposite and more complex behaviors. We also study the combined effects of coaxial offset and gap size. Read More

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http://dx.doi.org/10.1364/JOSAA.28.001662DOI Listing
August 2011
2 Reads

Electromagnetic enhancement by a periodic array of nanogrooves in a metallic substrate.

J Opt Soc Am A Opt Image Sci Vis 2011 May;28(5):879-86

Key Laboratory of Opto-Electronic Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China.

We present comprehensive investigations of the electromagnetic enhancement by a periodic array of rectangular nanogrooves in a metallic substrate. The impacts of array parameters and of illumination conditions on the enhanced electric-field intensity are explored using fully vectorial methods. The calculations are performed mainly for gold and for the visible and infrared wavelengths. Read More

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http://dx.doi.org/10.1364/JOSAA.28.000879DOI Listing
May 2011
8 Reads

Emitting far-field multicolor patterns and characters through plastic diffractive micro-optics elements illuminated by common Gaussian lasers in the visible range.

J Opt Soc Am A Opt Image Sci Vis 2011 Apr;28(4):724-33

Wuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology, Wuhan 430074, Hubei Province, China.

Far-field multicolor patterns and characters are emitted effectively in a relatively wide and deep spatial region by plastic diffractive micro-optics elements (DMOEs), which are illuminated directly by common Gaussian lasers in the visible range. Phase-only DMOEs are composed of a large number of fine step-shaped phase microstructures distributed sequentially over the plastic wafer selected. The initial DMOEs in silicon wafer are fabricated by an innovative technique with a combination of a single-mask ultraviolet photolithography and low-cost and rapid wet KOH etching. Read More

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http://dx.doi.org/10.1364/JOSAA.28.000724DOI Listing
April 2011
1 Read
1.560 Impact Factor

Comprehensive microscopic model of the extraordinary optical transmission.

J Opt Soc Am A Opt Image Sci Vis 2010 Dec;27(12):2542-50

Key Laboratory of Opto-electronic Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China.

As shown in a recent letter [Nature 452, 728 (2008)] with a microscopic model, the phenomenon of the extraordinary optical transmission (EOT) is intrinsically due to two distinct surface waves: the surface plasmon polariton and the quasi-cylindrical wave (quasi-CW) that efficiently funnel light into the hole aperture at resonance. Here we present a comprehensive microscopic model of the EOT that takes into account the two surface waves. The model preserves the desirable physical insight of the previous approach, but since it additionally takes into account the quasi-CWs, it provides highly accurate predictions over a much broader spectral range, from visible to microwave radiation. Read More

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http://dx.doi.org/10.1364/JOSAA.27.002542DOI Listing
December 2010

Performance comparison of wavefront reconstruction and control algorithms for Extremely Large Telescopes.

J Opt Soc Am A Opt Image Sci Vis 2010 Nov;27(11):A9-18

Instituto de Astrofísica de Canarias, Santa Cruz de Tenerife 38205, Spain.

Extremely Large Telescopes (ELTs) are very challenging with respect to their adaptive optics (AO) requirements. Their diameters and the specifications required by the astronomical science for which they are being designed imply a huge increment in the number of degrees of freedom in the deformable mirrors. Faster algorithms are needed to implement the real-time reconstruction and control in AO at the required speed. Read More

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http://dx.doi.org/10.1364/JOSAA.27.0000A9DOI Listing
November 2010

Tomography approach for multi-object adaptive optics.

J Opt Soc Am A Opt Image Sci Vis 2010 Nov;27(11):A253-64

Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA), Observatoire de Paris, CNRS, UPMC, Universite Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, France.

Multi-object adaptive optics (MOAO) is a solution developed to perform a correction by adaptive optics (AO) in a science large field of view. As in many wide-field AO schemes, a tomographic reconstruction of the turbulence volume is required in order to compute the MOAO corrections to be applied in the dedicated directions of the observed very faint targets. The specificity of MOAO is the open-loop control of the deformable mirrors by a number of wavefront sensors (WFSs) that are coupled to bright guide stars in different directions. Read More

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http://dx.doi.org/10.1364/JOSAA.27.00A253DOI Listing
November 2010
3 Reads

Design of a one-dimensional electromagnetic transparent wall.

J Opt Soc Am A Opt Image Sci Vis 2010 Oct;27(10):2237-43

School of Information Science and Engineering, Lanzhou University, Lanzhou 730000, China.

For a one-dimensional (1D) anisotropic slab, if its electromagnetic parameters satisfy certain conditions, an incident wave can be totally transmitted without any reflections. In this work, a classical method based on analytical results and a transformation optics method using an arbitrary piecewise continuous transformation function are applied to design a 1D electromagnetic transparent wall, whose presence does not disturb the field distribution in the ambient environment. Material parameters and the geometrical requirement of the layered structure using these two different methods are derived, and they agree well with each other. Read More

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http://dx.doi.org/10.1364/JOSAA.27.002237DOI Listing
October 2010
4 Reads

Electromagnetic enhancement by a single nano-groove in metallic substrate.

J Opt Soc Am A Opt Image Sci Vis 2010 Jul;27(7):1555-60

Key Laboratory of Opto-electronic Information Science and Technology, Ministry of Education,Institute of Modern Optics, Nankai University, Tianjin 300071, China.

We propose systematic investigations of the electromagnetic enhancement by a single nano-groove in gold substrate. The impacts of the groove parameters and of the illumination conditions on the enhanced intensity are explored using a fully vectorial numerical method. The obtained data can be well predicted and explained by a simple Fabry-Perot model. Read More

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http://dx.doi.org/10.1364/JOSAA.27.001555DOI Listing
July 2010
44 Reads

Explicit relations and optimal parameters for sidelobe suppression in optical vortices with a modified Bessel function.

J Opt Soc Am A Opt Image Sci Vis 2010 Apr;27(4):935-40

Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science & Technology,Ministry of Education of China, Nankai University, Tianjin, 300071, China.

This paper establishes explicit relations between the radial modulation and the optimal sidelobe expression effect in the Bessel-like modulation technique. It verifies that both central and outer ring areas of the phase plate result in sidelobes in the diffraction pattern, and the corresponding structural dimensions can be determined quantitatively. This approach gives rise to complete sidelobe suppression by taking optimal modulation parameters. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000935DOI Listing
April 2010
2 Reads

On the nonparaxial corrections of Bessel-Gauss beams.

J Opt Soc Am A Opt Image Sci Vis 2010 Mar;27(3):458-60

Optics Research Group, Department of Imaging Science and Technology, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.

The nonparaxial corrections for Bessel-Gauss beams were derived recently using two different approaches [Borghi et al., J. Opt. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000458DOI Listing
March 2010
1 Read

Signal processing for sidelobe suppression in optical coherence tomography images.

J Opt Soc Am A Opt Image Sci Vis 2010 Mar;27(3):415-21

Institute of Modern Optics, Nankai University, Key Laboratory of Opto-electronic Information Science and Technology, Education Ministry of China, Tianjin 300071, China.

In an optical coherence tomography system, the sidelobes of the point-spread function (PSF) introduced from the optical source reduce the A-scan imaging resolution and contrast of the images. A gradual iterative signal subtraction method based on the study of a point signal influenced by other points with different distances through the PSF is proposed in this paper. Comparing with the CLEAN algorithm and two typical deconvolution methods, the processed results demonstrate this algorithm can reduce sidelobes effectively with the least runtime. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000415DOI Listing
March 2010
20 Reads

Convergence analysis of the Newton algorithm and a pseudo-time marching scheme for diffuse correlation tomography.

J Opt Soc Am A Opt Image Sci Vis 2010 Feb;27(2):259-67

Department of Instrumentation, Indian Institute of Science, Bangalore, 560012, India.

We propose a self-regularized pseudo-time marching scheme to solve the ill-posed, nonlinear inverse problem associated with diffuse propagation of coherent light in a tissuelike object. In particular, in the context of diffuse correlation tomography (DCT), we consider the recovery of mechanical property distributions from partial and noisy boundary measurements of light intensity autocorrelation. We prove the existence of a minimizer for the Newton algorithm after establishing the existence of weak solutions for the forward equation of light amplitude autocorrelation and its Fréchet derivative and adjoint. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000259DOI Listing
February 2010

Recovery of spectral reflectances of imaged objects by the use of features of spectral reflectances.

J Opt Soc Am A Opt Image Sci Vis 2010 Feb;27(2):251-8

Department of Informatics, School of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashi-osaka, Osaka 577-8502, Japan.

Recovery of spectral reflectances of objects being imaged through the use of sensor responses is important to reproduce color images under various illuminations. Although the Wiener estimation is usually used for the recovery, the recovery performance of the estimation depends on the autocorrelation matrix of the spectral reflectances and the noise present in an image acquisition system. The purpose of the present paper is to show that the Wiener estimation with the noise variance estimated by the previous proposal [IEEE Trans. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000251DOI Listing
February 2010

The prior statistics of object colors.

Authors:
Jan J Koenderink

J Opt Soc Am A Opt Image Sci Vis 2010 Feb;27(2):206-17

Delft University of Technology, Faculty of Electrical Engineering, Mathematics, and Computer Science, Mekelweg 4, 2628 CD Delft, The Netherlands.

The prior statistics of object colors is of much interest because extensive statistical investigations of reflectance spectra reveal highly non-uniform structure in color space common to several very different databases. This common structure is due to the visual system rather than to the statistics of environmental structure. Analysis involves an investigation of the proper sample space of spectral reflectance factors and of the statistical consequences of the projection of spectral reflectances on the color solid. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000206DOI Listing
February 2010
2 Reads

Perceptual prominence of Hering's chromatic primaries.

J Opt Soc Am A Opt Image Sci Vis 2010 Feb;27(2):159-65

Polymer and Color Chemistry Program, Department of Textile Engineering, Chemistry, and Science, North Carolina State University, 2104 Research Drive, Raleigh, North Carolina 27695-8301, USA.

Reported are results of an experiment involving perceptual assessment of very large color differences using samples representing approximate mean Hering opponent generic unique hues (guHs) based on subject selections, intermediate hues (iHs) using Munsell samples intermediate between guHs, and pairings of both guHs and iHs with a neutral gray. Sample pairs were assessed by 28 color normal subjects twice, with a gap of at least 24 hours between assessments. Results were calculated for individual subjects and the entire group. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000159DOI Listing
February 2010
1 Read

Sizing homogeneous spherical particles from intensity-only angular scatter.

J Opt Soc Am A Opt Image Sci Vis 2010 Feb;27(2):151-8

Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

A set of algorithms is proposed to retrieve the size of spherically symmetric particles from the measured intensity of angular scatter data. Of special interest are low-contrast particles whose real part of the index of refraction is between 1.03 and 1. Read More

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http://dx.doi.org/10.1364/JOSAA.27.000151DOI Listing
February 2010

A neurophysiology-inspired steady-state color appearance model.

J Opt Soc Am A Opt Image Sci Vis 2009 Apr;26(4):776-82

Department of Computer Science, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK.

Color appearance models predict how a patch of color is perceived under specific illumination. We derive a new model based on neuroscientific insights, leading to a simpler explanation of color appearance while at the same time predicting existing psychophysical data with similar accuracy for chroma and higher accuracy for lightness and hue. Read More

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Study on electromagnetic scattering from the time-varying lossy dielectric ocean and a moving conducting plate above it.

Authors:
R Wang L-X Guo

J Opt Soc Am A Opt Image Sci Vis 2009 Mar;26(3):517-29

School of Science, Xidian University, Xi'an, Shaanxi Province, China.

The problem of electromagnetic (EM) scattering between the time-varying lossy dielectric ocean and a moving target is always solved by using some numerical algorithm. However, the elements of the impedance matrix and the surface electric and magnetic currents of the lossy dielectric ocean must be determined and evaluated again at different moments due to the varying of the ocean with time, and the numerical algorithm will produce an enormous amount of calculation. To overcome this shortcoming, the reciprocity theorem is used to solve the coupling field between a time-varying lossy dielectric ocean and a moving conducting plate above it. Read More

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Partially coherent illumination in full-field interferometric synthetic aperture microscopy.

J Opt Soc Am A Opt Image Sci Vis 2009 Feb;26(2):376-86

Beckman Institute for Advanced Science and Technology and the Department of Electrical and ComputerEngineering, University of Illinois at Urbana-Champaign, 405 North Mathews, Urbana, Illinois 61801, USA.

A model is developed for optical coherence tomography and interferometric synthetic aperture microscopy (ISAM) systems employing full-field frequency-scanned illumination with partial spatial coherence. This model is used to derive efficient ISAM inverse scattering algorithms that give diffraction-limited resolution in regions typically regarded as out of focus. Partial spatial coherence of the source is shown to have the advantage of mitigating multiple-scattering effects that can otherwise produce significant artifacts in full-field coherent imaging. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2883335PMC
February 2009
2 Reads

Deconvolution methods for image deblurring in optical coherence tomography.

J Opt Soc Am A Opt Image Sci Vis 2009 Jan;26(1):72-7

Institute of Modern Optics, Nankai University, Key Laboratory of Opto-electronic Information Science and Technology, Education Ministry of China, Tianjin, China.

Two-dimensional deconvolution methods are proposed to deblur optical coherence tomography images. One employs a two-dimensional deconvolution with a matrix given by the product of the longitudinal and transversal point-spread functions as its kernel, which can be taken as the general point-spread function of an optical coherence tomography system. The other uses two one-dimensional deconvolutions with the longitudinal and transversal point-spread functions successively. Read More

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January 2009
20 Reads

On design of free-form refractive beam shapers, sensitivity to figure error, and convexity of lenses.

Authors:
Vladimir Oliker

J Opt Soc Am A Opt Image Sci Vis 2008 Dec;25(12):3067-76

Department of Mathematics and Computer Science, Emory University, Atlanta, Georgia 30322, USA.

The problem of design of a two-lens optical system for reshaping the irradiance distribution of a laser beam in a prescribed manner is considered in the geometrical optics approximation. The presented design equations are derived in a rigorous manner and are applicable to free-form two-lens optical systems without any a priori symmetry assumptions on radiance profiles and beam cross sections. The obtained equations are applied to derive an equation defining sensitivity of the output radiation intensity to figure errors. Read More

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December 2008
2 Reads

Quantitative photoacoustic tomography from boundary pressure measurements: noniterative recovery of optical absorption coefficient from the reconstructed absorbed energy map.

J Opt Soc Am A Opt Image Sci Vis 2008 Sep;25(9):2347-56

Structures Laboratory, Department of Civil Engineering, Indian Institute of Science, Bangalore, India.

We describe a noniterative method for recovering optical absorption coefficient distribution from the absorbed energy map reconstructed using simulated and noisy boundary pressure measurements. The source reconstruction problem is first solved for the absorbed energy map corresponding to single- and multiple-source illuminations from the side of the imaging plane. It is shown that the absorbed energy map and the absorption coefficient distribution, recovered from the single-source illumination with a large variation in photon flux distribution, have signal-to-noise ratios comparable to those of the reconstructed parameters from a more uniform photon density distribution corresponding to multiple-source illuminations. Read More

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September 2008
4 Reads

Factors affecting the psychophysical image quality evaluation of mobile phone displays: the case of transmissive liquid-crystal displays.

J Opt Soc Am A Opt Image Sci Vis 2008 Sep;25(9):2215-22

Department of Colour Science, University of Leeds, Leeds, UK.

Display manufacturers require new data and computational models that consider the effect of ambient illumination in order to develop higher-quality displays. In this study, typical variations of small-sized mobile LCDs that exist in the real world were first simulated using a device characterization technique. In addition, psychophysical attributes (e. Read More

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September 2008
2 Reads

Phase retrieval with prior information.

Authors:
R Irwan R G Lane

J Opt Soc Am A 1998 Sep;15(9):2302-11

Department of Electrical and Electronic Engineering, University of Canterbury, Christchurch, New Zealand.

An algorithm for phase retrieval with Bayesian statistics is discussed. It is shown how the statistics of Kolmogorov turbulence can be used to compute the likelihood for a particular phase screen. This likelihood is then added to that of the observed data to produce a functional that is maximized directly by use of conjugate gradient maximization. Read More

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September 1998
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Robust determination of the anisotropic polarizability of nanoparticles using coherent confocal microscopy.

J Opt Soc Am A Opt Image Sci Vis 2008 Aug;25(8):2102-13

The Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

A coherent confocal microscope is proposed as a means to fully characterize the elastic scattering properties of a nanoparticle as a function of wavelength. Using a high numerical aperture lens, two-dimensional scanning, and a simple vector-beam shaper, the rank-2 polarizability tensor is estimated from a single confocal image. A method for computationally efficient data processing is described, and numerical simulations show that this algorithm is robust to noise and uncertainty in the focal plane position. Read More

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August 2008
2 Reads

Can laser speckle flowmetry be made a quantitative tool?

J Opt Soc Am A Opt Image Sci Vis 2008 Aug;25(8):2088-94

Department of Biomedical Engineering, Oregon Health and Science University, Portland, OR 97239, USA.

The ultimate objective of laser speckle flowmetry (and a host of specific implementations such as laser speckle contrast analysis, LASCA or LSCA; laser speckle spatial contrast analysis, LSSCA; laser speckle temporal contrast analysis, LSTCA; etc.) is to infer flow velocity from the observed speckle contrast. Despite numerous demonstrations over the past 25 years of such a qualitative relationship, no convincing quantitative relationship has been proven. Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2572153PMC
August 2008
1 Read

Multilayered optical memory with bits stored as refractive index change. III. Numerical results of a conventional multilayered optical memory.

J Opt Soc Am A Opt Image Sci Vis 2008 Jul;25(7):1810-9

Shanghai Key Laboratory of Contemporary Optics System, College of Optics and Electronic Information Engineering, University of Shanghai for Science and Technology, Shanghai, China.

In terms of the electromagnetic theories described in Part I of our current investigations [J. Opt. Soc. Read More

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July 2008
4 Reads

Multilayered optical memory with bits stored as refractive index change. II. Numerical results of a waveguide multilayered optical memory.

J Opt Soc Am A Opt Image Sci Vis 2008 Jul;25(7):1799-809

Shanghai Key Laboratory of Contemporary Optics System, College of Optics and Electronic Information Engineering, University of Shanghai for Science and Technology, Shanghai, China.

In terms of the electromagnetic theory described in Part I of our current investigations [J. Opt. Soc. Read More

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July 2008
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Stochastic electromagnetic beams focused by a bifocal lens.

J Opt Soc Am A Opt Image Sci Vis 2008 Jul;25(7):1710-5

Department of Electronic Science & Technology, Institute of Optics & Photonics, Huaqiao University, Quanzhou, Fujian, China.

In this paper, we study the focusing of a stochastic electromagnetic beam by a bifocal lens. By taking the electromagnetic Gaussian Schell-model (EGSM) beam as an example, the changes in the spectral density, in the spectral degree of coherence, and in the spectral degree of polarization of the EGSM beam as the beam is focused by an unapertured bifocal lens are investigated. It is shown that the spectral density, the spectral degree of coherence, and the spectral degree of polarization of the focused electromagnetic EGSM beams depend upon the coherence lengths and focal lengths of the bifocal lens. Read More

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July 2008
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Diffraction analysis of blazed transmission gratings with a modified extended scalar theory.

J Opt Soc Am A Opt Image Sci Vis 2008 Jun;25(6):1253-9

Key Laboratory of Opto-Electronic Information Science and Technology (Ministry of Education), Institute of Modern Optics, Nankai University, Tianjin 300071, China.

An alternative interpretation of the diffraction of blazed transmission gratings with moderate structure period is proposed according to a modified extended scalar theory (MEST). The diffraction field on the bottom facet of the grating is considered to be the interference of four subfields investigated in the problem of diffraction of a plane wave by an infinite half-plane. It is observed that MEST gives the total field that agrees with rigorous coupled-wave analysis (RCWA), and the result is more reliable than that of extended scalar theory (EST). Read More

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June 2008
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Optical design of freeform two-mirror beam-shaping systems.

Authors:
Vladimir Oliker

J Opt Soc Am A Opt Image Sci Vis 2007 Dec;24(12):3741-52

Department of Mathematics and Computer Science, Emory University, Atlanta, Georgia 30322, USA.

The problem of design of a two-mirror optical system for reshaping the irradiance distribution of a laser beam in a prescribed manner is considered in the geometrical optics approximation. The presented design equations are derived in a rigorous manner and are applicable to two-mirror optical systems not limited to radiance profiles and beam cross sections that are rotational or rectangular symmetric. The resulting mirrors are free-form surfaces not restricted by a priori constraints. Read More

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December 2007
2 Reads

Spectral self-interference microscopy for low-signal nanoscale axial imaging.

J Opt Soc Am A Opt Image Sci Vis 2007 Nov;24(11):3587-99

Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 405 North Mathews Avenue, Urbana, Illinois 61801, USA.

A theoretical and numerical analysis of spectral self-interference microscopy (SSM) is presented with the goal of expanding the realm of SSM applications. In particular, this work is intended to enable SSM imaging in low-signal applications such as single-molecule studies. A comprehensive electromagnetic model for SSM is presented, allowing arbitrary forms of the excitation field, detection optics, and tensor sample response. Read More

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http://ultra.bu.edu/papers/2007_Bryn_JOSA.pdf
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November 2007
4 Reads

Statistical analysis of a scatter plate interferometer.

Authors:
Jiabi Chen

J Opt Soc Am A Opt Image Sci Vis 2007 Jul;24(7):2082-8

College of Opto-Electro-Information Engineering, University of Shanghai for Science and Technology, China.

A scatter plate interferometer is analyzed based on the principle of statistical optics for what is to my knowledge the first time. It is shown that the optical complex amplitude distribution of scattered-direct light that is scattered by the first scatter plate and transmitted through the second scatter plate is equivalent to the distribution of direct-scattered light that is transmitted through the first scatter plate and scattered by the second scatter plate if there are no aberrations in the tested optical elements. Then the mechanism producing interference fringes and fringe contrast are discussed by means of a statistical method. Read More

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July 2007
1 Read