Papers by Nissim Benyosef
SPIE Proceedings, 2000
We demonstrate that near-field optical and atomic force microscopy data can be used for super-res... more We demonstrate that near-field optical and atomic force microscopy data can be used for super-resolution threedimensional (3-D) image restoration in optical sectioning fluorescence microscopy. A crucial feature in this approach is the full integration of such data sets with digital far-field images. The scanned probe data is used to provide modalities for boundary constraints which define surface optical information and spatial domains of optical alterations in a sample with a spatial precision that has been unachievable in the past. A restoration algorithm that can use such a complex of data for 3-D image deconvolution is presented. It uses a Tikhonov-Miller regularization scheme and allows for the imposition of different types of constraints to obtain super-resolution deconvolved images. Performance was tested by using simulated 3-D imaging. An example is given of the restoration of a 3-D wide field optical image of a biological specimen in the presence of atomic force constraints.
Applied Optics, 1986
ABSTRACT The correlation coefficient of the scintillations of two waves at different wavelengths ... more ABSTRACT The correlation coefficient of the scintillations of two waves at different wavelengths propagating simultaneously in the same turbulent atmosphere over the same path was measured. The results show that at weak turbulence the correlation is higher than predicted if the Kolmogorov spectrum is used. With increasing turbulence, it was found that correlation is lost much faster than predicted by MSP approximation if a constant shape turbulence spectrum is used. The experimental results can be partially accounted for if a dependence of the inner scale size parameter on turbulence strength is assumed. The experimental results indicate that with increasing turbulence strength the relative weight of the small size turbulent eddies increases.
Cleo 2011 Laser Science to Photonic Applications, May 1, 2011
We demonstrate an elliptically symmetric plasmonic lens that is illuminated by a radially-like po... more We demonstrate an elliptically symmetric plasmonic lens that is illuminated by a radially-like polarization field. This illumination function is TM polarized with regard to the plasmonic lens, ensuring optimum coupling of the incident light into surface plasmons polaritons. The structure is analyzed theoretically by using the Green function approach, and a finite difference time domain simulation. Both approaches provide similar results. Specifically we calculate and experimentally measure the field distribution on the surface and a few microns above it. The results show strong dependency of the electric field distribution on the eccentricity of the elliptic structure and the illumination wavelength. The interference of surface plasmons generates a structured pattern consisting of distinct peaks distributed inside the ellipse with locations that are wavelength dependent. This pattern can be used in several applications including structured illumination microscopy, particles beam trapping and sensing.
Infrared Technology and Applications XXIII, 1997
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Optical Engineering, 1993
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7th Mtg in Israel on Optical Engineering, 1991
Proceedings of SPIE - The International Society for Optical Engineering
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Optica Acta: International Journal of Optics, 1982
Optical Engineering, 1991
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10th Intl Optical Computing Conf, 1983
Journal of the Optical Society of America, 1978
A thermal activation energy of 1.5 eV for the activation of rhodopsin is needed to reduce the rat... more A thermal activation energy of 1.5 eV for the activation of rhodopsin is needed to reduce the rate of thermal activations below the rate of optical activation at the luminance of the absolute threshold. The thermal energy of 1.5 eV is not inconsistent with the optical threshold energy of about 1.8 eV.
Optics Letters, 2004
We suggest and demonstrate a new method for wave-front analysis based on common-path phase-shift ... more We suggest and demonstrate a new method for wave-front analysis based on common-path phase-shift interferometry. We introduce a formalism and an iterative mathematical algorithm in which the wave front is transformed, modified, and inversely transformed. The resulting intensity data are sufficient to reconstruct the entire wave front. In a more restricted case, in which the wave-front modifications are arbitrarily applied over arbitrary spatial regions of the wave front, the wave front is reconstructed semianalytically by use of a model that allows a local solution, followed by an iterative algorithm. Measurement results indicating that the suggested approach has an improved measurement accuracy with respect to existing quantitative phase measurement methods are presented.
Current Developments in Optical Design and Engineering VI, 1996
The present work delineates the principles of a direct vision color image intensifier tube. An ar... more The present work delineates the principles of a direct vision color image intensifier tube. An arrangement consisting of microchannel tube in conjunction with input color filters mosaic and matched output color filters mosaic is described. It is shown that color imaging can be achieved at very low light levels with acceptable color resolution. The present work is aimed at describing the basic theoretical model for simulation and analysis of color imaging tubes including quantification and optimization of its performance. The basic model incudes the major color tube components and operating parameters, namely, spectral characteristics of the RGB basic color filter's elements, its diameter and center-to-center spacing; spectral characteristic of the photocathode and phosphor; MCP's pore size, center-to-center spacing and gain; voltages and spacing between electrodes; tolerance of registration of input-output filters, etc. For a number of technologically achievable parameters it is shown that: (1) the resolution of the device, based on the Nyquist frequency, can reach 16 color (line pairs)/mm; (2) the light uniformity is about 5% which is insignificant; (3) realistic set of filters provides a good color transformation -- compatible to the transformation in color CRT displays; (4) cross-talk level in single basic color element from neighboring elements is about 6%; (5) the light amplification is compatible to conventional intensifier tubes; (6) the proposed configuration is not too sensitive to design parameters. It is possible to conclude that realistic configurations can produce a color direct vision image intensifier device with high resolution and good color transformation. The device simulations serve to design a workable prototype.
8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing, 1993
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Papers by Nissim Benyosef