Super-Resolution and Reconstruction of Sparse Sub-Wavelength Images (2009)
Gazit, Snir, Szameit, Alexander, Eldar, Yonina C., Segev, Mordechai
We use compressed sensing to demonstrate theoretically the reconstruction of sub-wavelength features from measured far-field, and provide experimental proof-of-concept. The methods can be applied to...
Prefect Klein tunneling in anisotropic graphene-like photonic lattices (2009)
Bahat-Treidel, Omri, Peleg, Or, Grobman, Mark, Shapira, Nadav, Pereg-Barnea, T., Segev, Mordechai
We study the scattering of waves off a potential step in deformed honeycomb lattices. For small deformations below a critical value, perfect Klein tunneling is obtained. This means that a potential...
Song Lan, Ming-feng Shih, Mordechai Segev
cond, photorefractive solitons form at microwatt (and lower) optical power levels. 12 Third, the photorefractive response is wavelength sensitive; therefore a weak soliton beam can guide an intense...
Stable Self-Guided Propagation of Two (2007)
Optical Harmonics Coupled, Victoria V. Steblina, Er V. Buryak, A. Sammut, Deyu Zhou, Mordechai Segev, ...
this paper we give the positive answer to the collapse suppression question, demonstrating that parametric interaction of two optical waves and a low-frequency field coupled through optical...
Two-dimensional multi-pole solitons in nonlocal nonlinear media (2006)
Rotschild, Carmel, Xu, Zhiyong, Cohen, Oren, Kartashov, Yaroslav V., Torner, Lluis, Segev, Mordechai
We present the experimental observation of scalar multi-pole solitons in highly nonlocal nonlinear media, including dipole-, tri-pole, quadru-pole, and necklace-type solitons, organized as arrays of...
Rotschild, Carmel, Cohen, Oren, Manela, Ofer, Segev, Mordechai, Carmon, Tal
We present an experimental study on wave propagation in highly nonlocal optically nonlinear media, for which far-away boundary conditions significantly affect the evolution of localized beams. As an...
Observation of 2nd band vortex solitons in 2D photonic lattices (2005)
Bartal, Guy, Manela, Ofer, Cohen, Oren, Fleischer, Jason W., Segev, Mordechai
We demonstrate second-band bright vortex-array solitons in photonic lattices. This constitutes the first experimental observation of higher-band solitons in any 2D periodic system. These solitons...
Brillouin-zone spectroscopy of nonlinear photonic lattices (2005)
Bartal, Guy, Cohen, Oren, Buljan, Hrvoje, Fleischer, Jason W., Manela, Ofer, Segev, Mordechai
We present a novel, real-time, experimental technique for linear and nonlinear Brillouin zone spectroscopy of photonic lattices. The method relies on excitation with random-phase waves and far-field...
Pattern formation in a ring cavity with temporally incoherent feedback (2004)
Schwartz, Tal, Fleischer, Jason W., Cohen, Oren, Buljan, Hrvjoe, Segev, Mordechai, Carmon, Tal
We present a theoretical and experimental study of modulation instability and pattern formation in a passive nonlinear optical cavity that is longer than the coherence length of the light circulating...
Random-phase spatial solitons in instantaneous nonlocal nonlinear media (2004)
Cohen, Oren, Buljan, Hrvoje, Schwartz, Tal, Fleischer, Jason W., Segev, Mordechai
We predict random-phase spatial solitons in instantaneous nonlocal nonlinear media. The key mechanism responsible for self-trapping of such incoherent wave-packets is played by the non-local (rather...
Collisions of two solitons in an arbitrary number of coupled nonlinear Schrödinger equations (2003)
Ken Steiglitz, Suzanne M. Sears, Mordechai Segev, Mariusz H. Jakubowski, Richard Squier
We show that pairwise soliton collisions in N>2 intensity-coupled nonlinear Schrödinger equations can be reduced to pairwise soliton collisions in two coupled equations. The reduction applies to...
Information transfer via cascaded collisions of vector solitons (2001)
Charalambos Anastassiou, Jason W. Fleischer, Tal Carmon, Mordechai Segev, Ken Steiglitz
We demonstrate experimentally the transport of information from one vector (Manakov-like) spatial soliton to another via collisions with a third, intermediate soliton. © 2001 Optical Society of...
Delayed-Action Interaction and Spin-Orbit Coupling between Solitons (2001)
Christodoulides, Demetrios N., Musslimani, Ziad H., Segev, Mordechai, Soljacic, Marin
Modulation Instability and Pattern Formation in Spatially Incoherent Light Beams (2000)
Kip, Detlef, Soljacic, Marin, Segev, Mordechai, Eugenieva, Evgenia, Christodoulides, Demetrios N.
We present the first experimental observation of modulation instability of partially spatially incoherent light beams in non-instantaneous nonlinear media. We show that even in such a nonlinear...
Bouncing of vector solitons (2000)
Charalambos Anastassiou, Ken Steiglitz, Darrin Lewis, Mordechai Segev, J. A. Giordmaine
Abstract: We show how to control the collisions of vector solitons: from solitons going through each other, to solitons bouncing off each other. In bouncing, a weak soliton component switches most of...
Induced Coherence and Stable Soliton Spiraling (1998)
Buryak, Alexander V., Kivshar, Yuri S., Shih, Ming-feng, Segev, Mordechai
We develop a theory of soliton spiraling in a bulk nonlinear medium and reveal a new physical mechanism: periodic power exchange via induced coherence, which can lead to stable spiraling and the...
Self-trapping of Necklace beams in Self-focusing Kerr media (1998)
Soljacic, Marin, Sears, Suzanne, Segev, Mordechai
We show that an azimuthally-periodically-modulated bright ring "necklace" beam can self-trap in self-focusing Kerr media and can exhibit stable propagation for very large distances. These are the...
Ostrovskaya, Elena A., Kivshar, Yuri S., Chen, Zhigang, Segev, Mordechai
We describe a physical mechanism for creating multi-soliton bound states where solitons are glued together by attraction between the beams they guide, `solitonic gluons'. We verify the concept of the...
Hongxing Meng, Gregory Salamo, Mordechai Segev
vels deep in the forbidden energy gap, thereby increasing the conductivity (decreasing the resistivity) in the illuminated region. Therefore the applied voltage creates an electric field primarily in...
High-Intensity Nanosecond Photorefractive Spatial Solitons (1998)
Konstantin Kos, Gregory Salamo, Mordechai Segev
al intensity, it is precisely this dependence that prevents the existence of stable two-dimensional (2D) bright Kerr solitons. Recently, a new type of spatial soliton 1 based on the photorefractive...
Interaction between vector solitons and solitonic gluons (1998)
Elena A. Ostrovskaya, Yuri S. Kivshar, Zhigang Chen, Mordechai Segev
We describe a physical mechanism for creating multisoliton bound states by which optical solitons are glued together by attraction between the nonsoliton beams that they guide, solitonic gluons. We...
Coherent Collisions of Photorefractive Solitons (1997)
Hongxing Meng, Greg Salamo, Ming-feng Shih, Mordechai Segev
torefractive solitons was reported. 16 Here we report observations of coherent collisions between photorefractive solitons. The solitons exert repulsion or attraction forces upon each other,...
Steady-State Vortex-Screening Solitons Formed in Biased Photorefractive Media (1997)
Zhigang Chen, Ming-feng Shih, Mordechai Segev, Daniel W. Wilson, Richard E. Muller, Paul D. Maker
ripes in any direction in the transverse plane. Thus it was possible to generate isotropic structures such as dark soliton crosses and grids 4 as well as circular vortex solitons. 2,3 Following the...
Nonlinear self-phase matching of optical second harmonic generation in lithium niobate (1996)
Orlov, Sergei, Yariv, Amnon, Segev, Mordechai
We show that the nonlinear index perturbation due to light-induced photovoltaic space-charge field in LiNbO3 can give rise to self-phase matching of second harmonic generation. Increase of the...
Optical and electrical Barkhausen noise induced by recording ferroelectric domain holograms (1995)
Kewitsch, Anthony S., Saito, Akira, Yariv, Amnon, Segev, Mordechai, Neurgaonkar, Ratnakar R.
Ferroelectric domain gratings with periods of the order of an optical wavelength are induced in strontium barium niobate by photorefractive space-charge fields. We measure the Barkhausen noise in...
Light-induced absorption in photorefractive strontium barium niobate (1994)
Orlov, Sergei, Segev, Mordechai, Yariv, Amnon, Neurgaonkar, Ratnakar R.
Sr0.59Bao.41Nb2O6 and Sro.75Bao.25Nb2O6 exhibit an intensity-dependent absorption in the visible spectral range. We perform pump (green)-probe (red) measurements and find variation as high as 0.45...
Stability of photorefractive spatial solitons (1994)
Segev, Mordechai, Crosignani, Bruno, Di Porto, Paolo, Yariv, Amnon, Duree, Galen, Salamo, Gregory, ...
We present a theoretical analysis of the stability of photorefractive spatial solitons along with experimental results that show that the solitons are stable for small-scale perturbations but break...
Double phase conjugation (1994)
Engin, Doruk, Segev, Mordechai, Orlov, Sergei, Yariv, Amnon, Valley, George C.
We model the double phase-conjugate mirror (DPCM) as a function of time, the average direction of propagation of the two beams forming the DPCM, and one transverse coordinate. Calculations show that...
Intersubband-transition-induced phase matching (1994)
Almogy, Gilad, Segev, Mordechai, Yariv, Amnon
We suggest the use of the refractive-index changes associated with the intersubband transitions in quantum wells for phase matching in nonlinear materials. An improvement in the conversion efficiency...
Dimensionality and size of photorefractive spatial solitons (1994)
Duree, Galen, Salamo, Gregory, Segev, Mordechai, Yariv, Amnon, Crosignani, Bruno, Di Porto, Paolo, ...
We study experimentally self-trapping of optical beams in photorefractive media and show that the trapping is inherently asymmetric with respect to the two (transverse) trapping dimensions. We also...
Conjugation fidelity and reflectivity in photorefractive double phase-conjugate mirrors (1994)
Orlov, Sergei, Segev, Mordechai, Yariv, Amnon, Valley, George C.
We present an experimental study of the behavior of photorefractive double phase-conjugate mirrors that illustrates recent theoretical predictions. We observe a sharp fidelity threshold that...
Temporal evolution of photorefractive double phase-conjugate mirrors (1993)
Segev, Mordechai, Engin, Doruk, Yariv, Amnon, Valley, George C.
We present wave-optics calculations of the temporal and spatial evolution from random noise of a double phase-conjugate mirror in photorefractive media that show its image exchange and phase-reversal...
Rosen, Joseph, Segev, Mordechai, Yariv, Amnon, Barhen, Jacob
We suggest a method for coding high-resolution computer-generated volume holograms. It involves splitting the computer-generated hologram into multiple holograms, their individual recording as volume...
Selective page-addressable fixing of volume holograms in Sr0.75Ba0.25Nb2O6 crystals (1993)
Kewitsch, Anthony S., Segev, Mordechai, Yariv, Amnon, Neurgaonkar, Ratnakar
We demonstrate selective fixing of volume holograms in photorefractive media. Each holographic page may be fixed individually and overwritten without destroying the other fixed pages. We present...
Temporal evolution of fanning in photorefractive materials (1993)
Segev, Mordechai, Engin, Doruk, Yariv, Amnon, Valley, George C.
We present detailed calculations of the temporal and spatial evolution of beam fanning in photorefractive crystals that is initiated by scattering from noise. We show that fanning starts from beam...
Wavelength-multiplexed computer-generated volume holography (1993)
Rosen, Joseph, Segev, Mordechai, Yariv, Amnon
We demonstrate recording and reconstruction of multiple-computer-generated wavelength-multiplexed volume holograms in a holographic storage medium. The holograms display high selectivity, and their...
Electric-field multiplexing/demultiplexing of volume holograms in photorefractive media (1993)
Kewitsch, Anthony S., Segev, Mordechai, Yariv, Amnon, Neurgaonkar, Ratnakar R.
We propose a new method of volume hologram multiplexing/demultiplexing in noncentrosymmetric media. Volume holograms may be multiplexed by tuning the material parameters of the recording medium (such...
Self-enhanced diffraction from fixed photorefractive gratings during coherent reconstruction (1993)
Segev, Mordechai, Kewitsch, Anthony, Yariv, Amnon, Rakuljic, George A.
We explore, theoretically and experimentally, the effects of self-enhancement (or self-depletion) of the diffraction which occurs during coherent reconstruction from fixed photorefractive gratings....
Self-trapping of optical beams in photorefractive media (1993)
Crosignani, Bruno, Segev, Mordechai, Engin, Doruk, Di Porto, Paolo, Yariv, Amnon, Salamo, Greg
We study the possibility of self-trapping of an optical beam in a photorefractive medium under the combined influence of diffraction and self-scattering (two-wave mixing) of its spatial frequency...
Joseph Rosen, Mordechai Segev, Aminon Yariv, Jacob Barhen
We suggest a method for coding high-resolution computer-generated volume holograms. It involves splitting the computer-generated hologram into multiple holograms, their individual recording as volume...
Interferometric electro-optical signal processors with partially coherent illumination (1992)
Rosen, Joseph, Segev, Mordechai, Shamir, Joseph, Yaiv, Amnon
Fourier- and Hartley-related transforms are realized in a family of interferometers. The implementation of these interferometers as image correlators is investigated theoretically and experimentally...
Limitation on holographic storage in photorefractive waveguides (1992)
Segev, Mordechai, Yariv, Amnon, Shamir, Joseph
We show that photorefractive waveguide devices are subject to a limitation on their holographic storage capability owing to transversely nonuniform nonlinear losses to evanescent and radiation modes.
Optical interferometry between image-bearing beams and their redirected phase conjugates (1992)
Segev, Mordechai, Yariv, Amnon
We present three new interferometers, which are based on interference between combinations of image-bearing optical fields and their redirected phase-conjugate reflections in two- and...
Wavelength-multiplexed computer-generated volume holography (1992)
Joseph Rosen, Mordechai Segev, Amnnon Yariv
We demonstrate recording and reconstruction of multiple-computer-generated wavelength-multiplexed volume holograms in a holographic storage medium. The holograms display high selectivity, and their...
Phase conjugation involving incoherent counterpropagating beams in photorefractive media (1991)
Segev, Mordechai, Yariv, Amnon
We propose and analyze a new type of phase conjugation between counterpropagating beams in photorefractive materials based on diffraction from transmission gratings only. This effect does not require...
Interferometric electro-optical signal processors with partially coherent (1991)
Joseph Rosen, Mordechai Segev, Joseph Shamir, Amnon Yariv
illumination
Mathematical frontiers in optical solitons
Bronski, Jared C., Segev, Mordechai, Weinstein, Michael I.
Solitons are localized concentrations of field energy, resulting from a balance of dispersive and nonlinear effects. They are ubiquitous in the natural sciences. In recent years optical solitons have...
Clustering of solitons in weakly correlated wavefronts
Chen, Zhigang, Sears, Suzanne M., Martin, Hector, Christodoulides, Demetrios N., Segev, Mordechai
We demonstrate theoretically and experimentally the spontaneous clustering of solitons in partially coherent wavefronts during the final stages of pattern formation initiated by modulation...
Mathematical frontiers in optical solitons
Bronski, Jared C., Segev, Mordechai, Weinstein, Michael I.
Solitons are localized concentrations of field energy, resulting from a balance of dispersive and nonlinear effects. They are ubiquitous in the natural sciences. In recent years optical solitons have...
Clustering of solitons in weakly correlated wavefronts
Chen, Zhigang, Sears, Suzanne M., Martin, Hector, Christodoulides, Demetrios N., Segev, Mordechai
We demonstrate theoretically and experimentally the spontaneous clustering of solitons in partially coherent wavefronts during the final stages of pattern formation initiated by modulation...