Prof. Uzi Efron Profile

Prof. Uzi Efron

Researcher at Ben-Gurion Univ of the Negev

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 2 September 2009 Paper

Fast surface plasmon-polariton-based optical phase modulator

O. Guilatt, B. Apter, U. Efron

Proceedings Volume 7395, 73952B (2009) https://doi.org/10.1117/12.825674

KEYWORDS: Phase shift keying, Spiral phase plates, Modulation, Refractive index, Modulators, Phase modulation, Dielectrics, Spatial light modulators, Absorption, Electro optics

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Proceedings Article | 2 September 2009 Paper

Peripheral vision enhancement for the AMD impaired

Michael Weyl, Uzi Efron

Proceedings Volume 7443, 74432E (2009) https://doi.org/10.1117/12.825685

KEYWORDS: Visualization, Eye, Image enhancement, Enhanced vision, Spatial resolution, Spatial frequencies, Signal detection, Diamond, Resolution enhancement technologies, Macula

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Proceedings Article | 28 August 2009 Paper

Design of integrated eye tracker-display device for head mounted systems

Y. David, B. Apter, N. Thirer, I. Baal-Zedaka, U. Efron

Proceedings Volume 7419, 741910 (2009) https://doi.org/10.1117/12.826316

KEYWORDS: Eye, Image processing, Near infrared, LCDs, Imaging systems, Electrodes, Head-mounted displays, Liquid crystal on silicon, Retina, Control systems

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Proceedings Article | 20 August 2009 Paper

Study of LSPR-enhanced absorption for solar cell applications: preliminary results

O. Guilatt, B. Apter, U. Efron

Proceedings Volume 7411, 74110M (2009) https://doi.org/10.1117/12.825679

KEYWORDS: Absorption, Silicon, Silica, Silver, Solar cells, Plasmonics, Resonance enhancement, Finite-difference time-domain method, Surface plasmons, Interfaces

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Proceedings Article | 26 September 2007 Paper

Back-illuminated CMOS APS with low crosstalk level

Y. David, U. Efron

Proceedings Volume 6660, 666015 (2007) https://doi.org/10.1117/12.732809

KEYWORDS: Imaging systems, Diodes, Back illuminated sensors, CMOS technology, Transceivers, Transistors, Quantum efficiency, LCDs, Device simulation, Liquid crystal on silicon

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Proceedings Article | 24 September 2007 Paper

Image enhancement methods for the visually impaired

O. Bogillo, U. Efron

Proceedings Volume 6696, 66960H (2007) https://doi.org/10.1117/12.732896

KEYWORDS: Image enhancement, Visualization, Image processing, Image filtering, Contrast sensitivity, Computer simulations, Visual process modeling, Image quality, Spatial frequencies, Image contrast enhancement

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Proceedings Article | 12 September 2007 Paper

Considerations concerning an image transceiver system design

Nonel Thirer, Yitzhak David, I. Baal Zedaka, Uzi Efron

Proceedings Volume 6660, 666012 (2007) https://doi.org/10.1117/12.733039

KEYWORDS: Image processing, Field programmable gate arrays, Imaging systems, Video processing, Video, Transceivers, Clocks, Data conversion, Embedded systems, Information technology

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Proceedings Article | 12 September 2007 Paper

Computer simulation of liquid crystal spatial light modulator based on surface plasmon resonance

P. Kogan, B. Apter, I. Baal-Zedaka, U. Efron

Proceedings Volume 6654, 66540N (2007) https://doi.org/10.1117/12.732989

KEYWORDS: Metals, Surface plasmons, Refractive index, Spatial light modulators, Liquid crystals, Spatial resolution, Modulation, Dielectrics, Silver, Finite-difference time-domain method

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Spatial resolution is an important performance characteristic of spatial light modulators (SLM). This parameter depends on the physical properties of the electro-optical material, as well as on the design features of the SLM. One of the key factors affecting the spatial resolution of liquid crystal (LC)-based SLM is the fringing field effect. This effect can be reduced in thin LC cells with corresponding reduction in the electro-optical response. A strong electro-optic response in thin LC layer can be attained using the Surface Plasmon Resonance (SPR) phenomenon. While SPR-based LC SLMs were already demonstrated about 15 years ago, their development has been hampered by the fact that these devices are expected to have a relatively low resolution, due to the finite propagation length (several tens of micrometers) of the surface plasmons (SP). This study is aimed at improving the spatial resolution of the SPR-SLM by optimizing the metal-dielectric structure of the device. In particular, a small-scale patterning of the metal layer supporting the propagation of SPs is considered a possible solution for reducing the spatial blurring associated with long propagation length of SPs. Detailed computer simulations of the spatial resolution of the SPR-based LC SLM structure have been carried out using both the rigorous coupled wave analysis (RCWA) and the finite difference time domain (FDTD) method. These simulations were performed for an SLM structure based on the well-known prism-type, Kretschmann excitation configuration. The SLM performance for various spatial resolutions was simulated by introducing a dielectric layer with periodically modulated refractive index. The RCWA technique was used for an initial estimate of the SP excitation angle and the optimal thickness of the silver layer supporting the SP propagation. The FDTD method was used for detailed analysis of near and far field spatial distribution of the modulated light. The results of this study showing improved resolution LC-SP-SLM are presented here.r

Proceedings Article | 15 September 2006 Paper

Recent studies in LC devices and technology

U. Efron, B. Apter, R. Israeli, I. David, I. Baal-Zedaka

Proceedings Volume 6332, 63320K (2006) https://doi.org/10.1117/12.680995

KEYWORDS: Liquid crystals, Electrodes, Diffraction, Electro optics, Reflectivity, Refractive index, LCDs, Modulation, Phase modulation, Diffraction gratings

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Proceedings Article | 7 September 2006 Paper

Improvement of pipelines implementations in FPGA designs

Nonel Thirer, Yitzhak David, I. Baal Zedaka, Uzi Efron

Proceedings Volume 6294, 62940T (2006) https://doi.org/10.1117/12.678445

KEYWORDS: Image processing, Field programmable gate arrays, Data conversion, Clocks, Superposition, Signal processing, Video processing, Image acquisition, Intelligence systems, Imaging systems

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Proceedings Article | 6 September 2006 Paper

Low vision goggles: optical design studies

Ofer Levy, Boris Apter, Uzi Efron

Proceedings Volume 6289, 62890I (2006) https://doi.org/10.1117/12.680941

KEYWORDS: Goggles, Optical design, Eye, Beam splitters, Modulation transfer functions, Mirrors, Imaging systems, Monochromatic aberrations, Visualization, Video

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Proceedings Article | 25 August 2006 Paper

Modeling of image perception and discrimination by the visually impaired

Avi Benguigui, Uzi Efron

Proceedings Volume 6313, 63130F (2006) https://doi.org/10.1117/12.679791

KEYWORDS: Visual process modeling, Visualization, Spatial frequencies, Image enhancement, Goggles, Contrast sensitivity, Electro optical modeling, Transceivers, Retina, Holons

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Proceedings Article | 15 September 2005 Paper

Efficient face recognition method using a combined phase congruency/Gabor wavelet technique

E. Bezalel, U. Efron

Proceedings Volume 5908, 59081K (2005) https://doi.org/10.1117/12.618226

KEYWORDS: Principal component analysis, Image filtering, Wavelets, Image processing, Facial recognition systems, Phase measurement, Distance measurement, Edge detection, Wavelet transforms, Image compression

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Proceedings Article | 13 September 2005 Paper

Electro-optical wide-angle beam deflection based on transversal-field-induced refractive index inhomogeneity in a liquid crystal layer

Boris Apter, Eldad Bahat-Treidel, Uzi Efron

Proceedings Volume 5892, 58921B (2005) https://doi.org/10.1117/12.618239

KEYWORDS: Liquid crystals, Electrodes, Refractive index, Glasses, Ray tracing, CCD cameras, Collimators, Electro optics, Far-field diffraction, Diffraction

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Proceedings Article | 30 August 2005 Paper

Studies of fringing field effects in liquid crystal beam-steering devices

Uzi Efron, Boris Apter, Eldad Bahat-Treidel

Proceedings Volume 5936, 59360P (2005) https://doi.org/10.1117/12.618218

KEYWORDS: Liquid crystals, Diffraction, Computer simulations, Electrodes, Instrument modeling, Diffraction gratings, LCDs, Dielectrics, Performance modeling, Fourier transforms

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SPIE Journal Paper | 1 May 2005

Continuously controllable, wide-angle liquid crystal beam deflector based on the transversal field effect in a three-electrode cell

Boris Apter, Eldad Bahat-Treidel, Uzi Efron

OE, Vol. 44, Issue 05, 054001, (May 2005) https://doi.org/10.1117/12.10.1117/1.1911125

KEYWORDS: Liquid crystals, Electrodes, Refractive index, Ray tracing, CCD cameras, Optical engineering, Glasses, Birefringence, Diffraction, Computer simulations

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SPIE Journal Paper | 1 December 2004

Simple method for controlled variation of liquid crystal cell thickness

Eldad Bahat-Treidel, Boris Apter, Uzi Efron

OE, Vol. 43, Issue 12, (December 2004) https://doi.org/10.1117/12.10.1117/1.1810143

KEYWORDS: Liquid crystals, Holons, Photodetectors, Electrical engineering, LCDs, Optical alignment, Birefringence, Sensors, Polarizers, Fiber amplifiers

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Proceedings Article | 8 November 2001 Paper

CMOS/LCOS-based image transceiver device: II

Uzi Efron, Isak Davidov, Vladimir Sinelnikov, Asher Friesem

Proceedings Volume 4457, (2001) https://doi.org/10.1117/12.447753

KEYWORDS: LCDs, Imaging systems, Image processing, Silicon, Transceivers, Liquid crystals, Information technology, Liquid crystal on silicon, Data conversion, Electrodes

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Proceedings Article | 8 November 2001 Paper

LC-based subwavelength diffractive optical element structures for optical cross-connect applications

Boris Apter, Shy Acco, Uzi Efron

Proceedings Volume 4457, (2001) https://doi.org/10.1117/12.447757

KEYWORDS: Liquid crystals, Diffraction, Diffraction gratings, Metals, Refractive index, Electrodes, Reflectivity, Phase shift keying, Phase modulation, Binary data

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Proceedings Article | 15 May 2001 Paper

CMOS-liquid-crystal-based image transceiver device

Uzi Efron, Isak Davidov, Vladimir Sinelnikov, Ilya Levin

Proceedings Volume 4306, (2001) https://doi.org/10.1117/12.426960

KEYWORDS: LCDs, Image processing, Imaging systems, Silicon, Transceivers, Information technology, Liquid crystals, Electrodes, Video, Data conversion

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Proceedings Article | 30 March 2001 Paper

LC-beam steering device based on subwavelength diffractive optical element structure

Boris Apter, Eli Schwartz, Uzi Efron

Proceedings Volume 4294, (2001) https://doi.org/10.1117/12.420778

KEYWORDS: Liquid crystals, Diffraction gratings, Diffraction, Glasses, Electrodes, Refractive index, Beam steering, Diffractive optical elements, Phase modulation, Fabry–Perot interferometers

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Proceedings Article | 15 September 1995 Paper

Ultrastructure synthesis of special architectures for photonic applications: high-frequency electro-optic modulators and high-density optical memories

Larry Dalton, Aaron Harper, Jingsong Zhu, William Steier, R. Salovey, J. Wu, Uzi Efron

Proceedings Volume 2528, (1995) https://doi.org/10.1117/12.219537

KEYWORDS: Chromophores, Polymers, Electro optic polymers, Sol-gels, Nonlinear optics, Polymer thin films, Electro optics, Hole burning spectroscopy, Electrooptic modulators, Optical storage

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Proceedings Article | 13 August 1993 Paper

Application of wire-grid silicon liquid crystal light valve in nonlinear optical pattern recognition

Bahram Javidi, Guanshen Zhang, Amir Fazlollahi, Uzi Efron

Proceedings Volume 1911, (1993) https://doi.org/10.1117/12.151221

KEYWORDS: Liquid crystals, Light valves, Optical correlators, Computer simulations, Joint transforms, Fourier transforms, Beam splitters, Optical pattern recognition, Silicon, Liquid crystal on silicon

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Proceedings Article | 15 June 1992 Paper

Dynamic IR scene projection using the Hughes liquid crystal light valve

Richard Forber, Anson Au, Uzi Efron, Keyvan Sayyah, Shin-Tson Wu, George Goldsmith

Proceedings Volume 1665, (1992) https://doi.org/10.1117/12.60394

KEYWORDS: Liquid crystals, Projection systems, Black bodies, Infrared imaging, Silicon, Modulation, Diodes, Spatial resolution, Light valves, Image resolution

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Proceedings Article | 1 June 1991 Paper

Charge-coupled-device-addressed liquid-crystal light valve: an update

Uzi Efron, W. Byles, Norman Goodwin, Richard Forber, Keyvan Sayyah, ChiungSheng Wu, Murray Welkowsky

Proceedings Volume 1455, (1991) https://doi.org/10.1117/12.44695

KEYWORDS: Charge-coupled devices, Liquid crystals, Silicon, Light valves, Video, Semiconducting wafers, Spatial light modulators, CCD cameras, Modulation, Oxides

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Proceedings Article | 1 June 1991 Paper

Schottky diode silicon liquid-crystal light valve

Keyvan Sayyah, Uzi Efron, Richard Forber, Norman Goodwin, Philip Reif

Proceedings Volume 1455, (1991) https://doi.org/10.1117/12.44697

KEYWORDS: Liquid crystals, Diodes, Silicon, Visible radiation, Modulation transfer functions, Light valves, Liquid crystal on silicon, Spatial light modulators, Modulation, Crystals

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