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Segev M, Küsters H, Pelloni S. Transmutation of Neptunium, Americium, Technetium, and Iodine in Fast Spectrum Cores Driven by Accelerated Protons. NUCL SCI ENG 2017. [DOI: 10.13182/nse96-a28551] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Radkowsky A, Segev M, Galperin A. The Power-Sharing Formula for a Seed/Blanket Core — Resolution of a Paradox. NUCL SCI ENG 2017. [DOI: 10.13182/nse86-a17120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Segev M, Galperin A, Schwageraus E. Use of Axially Graded Burnable Boron for Hot-Spot Temperature Reduction in a Pressurized Water Reactor Core. NUCL SCI ENG 2017. [DOI: 10.13182/nse00-a2140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Stepanek J, Segev M. Surface Current Double-Heterogeneous Multilayer Multicell Methodology. NUCL SCI ENG 2017. [DOI: 10.13182/nse91-a23820] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Galperin A, Segev M, Todosow M. A Pressurized Water Reactor Plutonium Incinerator Based on Thorium Fuel and Seed-Blanket Assembly Geometry. NUCL TECHNOL 2017. [DOI: 10.13182/nt00-a3140] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Krumbein AD, Lemanska M, Segev M, Wagschal JJ, Yaari A. Reaction Rate Calculations in Uranium and Thorium Blankets Surrounding a Central Deuterium-Tritium Neutron Source. NUCL TECHNOL 2017. [DOI: 10.13182/nt80-a32457] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Weimann S, Kremer M, Plotnik Y, Lumer Y, Nolte S, Makris KG, Segev M, Rechtsman MC, Szameit A. Topologically protected bound states in photonic parity-time-symmetric crystals. NATURE MATERIALS 2017; 16:433-438. [PMID: 27918567 DOI: 10.1038/nmat4811] [Citation(s) in RCA: 155] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 10/28/2016] [Indexed: 05/05/2023]
Abstract
Parity-time (PT)-symmetric crystals are a class of non-Hermitian systems that allow, for example, the existence of modes with real propagation constants, for self-orthogonality of propagating modes, and for uni-directional invisibility at defects. Photonic PT-symmetric systems that also support topological states could be useful for shaping and routing light waves. However, it is currently debated whether topological interface states can exist at all in PT-symmetric systems. Here, we show theoretically and demonstrate experimentally the existence of such states: states that are localized at the interface between two topologically distinct PT-symmetric photonic lattices. We find analytical closed form solutions of topological PT-symmetric interface states, and observe them through fluorescence microscopy in a passive PT-symmetric dimerized photonic lattice. Our results are relevant towards approaches to localize light on the interface between non-Hermitian crystals.
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Makris KG, Kaminer I, El-Ganainy R, Efremidis NK, Chen Z, Segev M, Christodoulides DN. Accelerating diffraction-free beams in photonic lattices. OPTICS LETTERS 2014; 39:2129-2132. [PMID: 24686692 DOI: 10.1364/ol.39.002129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We study nondiffracting accelerating paraxial optical beams in periodic potentials, in both the linear and the nonlinear domains. In particular, we show that only a unique class of z-dependent lattices can support a true accelerating diffractionless beam. Accelerating lattice solitons, autofocusing beams and accelerating bullets in optical lattices are systematically examined.
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Szameit A, Shechtman Y, Osherovich E, Bullkich E, Sidorenko P, Dana H, Steiner S, Kley EB, Gazit S, Cohen-Hyams T, Shoham S, Zibulevsky M, Yavneh I, Eldar YC, Cohen O, Segev M. Sparsity-based single-shot subwavelength coherent diffractive imaging. NATURE MATERIALS 2012; 11:455-9. [PMID: 22466747 DOI: 10.1038/nmat3289] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 02/29/2012] [Indexed: 05/08/2023]
Abstract
Coherent Diffractive Imaging (CDI) is an algorithmic imaging technique where intricate features are reconstructed from measurements of the freely diffracting intensity pattern. An important goal of such lensless imaging methods is to study the structure of molecules that cannot be crystallized. Ideally, one would want to perform CDI at the highest achievable spatial resolution and in a single-shot measurement such that it could be applied to imaging of ultrafast events. However, the resolution of current CDI techniques is limited by the diffraction limit, hence they cannot resolve features smaller than one half the wavelength of the illuminating light. Here, we present sparsity-based single-shot subwavelength resolution CDI: algorithmic reconstruction of subwavelength features from far-field intensity patterns, at a resolution several times better than the diffraction limit. This work paves the way for subwavelength CDI at ultrafast rates, and it can considerably improve the CDI resolution with X-ray free-electron lasers and high harmonics.
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Levi L, Rechtsman M, Freedman B, Schwartz T, Manela O, Segev M. Disorder-Enhanced Transport in Photonic Quasicrystals. Science 2011; 332:1541-4. [DOI: 10.1126/science.1202977] [Citation(s) in RCA: 133] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Makris KG, Christodoulides DN, Peleg O, Segev M, Kip D. Optical transitions and Rabi oscillations in waveguide arrays. OPTICS EXPRESS 2008; 16:10309-10314. [PMID: 18607440 DOI: 10.1364/oe.16.010309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
It is theoretically demonstrated that Rabi interband oscillations are possible in waveguide arrays. Such transitions can take place in optical lattices when the unit-cell is periodically modulated along the propagation direction. Under phase-matching conditions, direct power transfer between two Floquet-Bloch modes can occur. In the nonlinear domain, periodic oscillations between two different lattice solitons are also possible.
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El-Ganainy R, Christodoulides DN, Musslimani ZH, Rotschild C, Segev M. Optical beam instabilities in nonlinear nanosuspensions. OPTICS LETTERS 2007; 32:3185-3187. [PMID: 17975638 DOI: 10.1364/ol.32.003185] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We investigate the modulation instability of plane waves and the transverse instabilities of soliton stripe beams propagating in nonlinear nanosuspensions. We show that in these systems the process of modulational instability depends on the input beam conditions. On the other hand, the transverse instability of soliton stripes can exhibit new features as a result of 1D collapse caused by the exponential nonlinearity.
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El-Ganainy R, Christodoulides DN, Rotschild C, Segev M. Soliton dynamics and self-induced transparency in nonlinear nanosuspensions. OPTICS EXPRESS 2007; 15:10207-10218. [PMID: 19547370 DOI: 10.1364/oe.15.010207] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We study spatial soliton dynamics in nano-particle suspensions. Starting from the Nernst-Planck and Smoluchowski equations, we demonstrate that in these systems the underlying nonlinearities as well as the nonlinear Rayleigh losses depend exponentially on optical intensity. Two different nonlinear regimes are identified depending on the refractive index contrast of the nanoparticles involved and the interesting prospect of self-induced transparency is demonstrated. Soliton stability is systematically analyzed for both 1D and 2D configurations and their propagation dynamics in the presence of Rayleigh losses is examined. The possibility of synthesizing artificial nonlinearities using mixtures of nanosuspensions is also considered.
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Pezer R, Buljan H, Bartal G, Segev M, Fleischer JW. Incoherent white-light solitons in nonlinear periodic lattices. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 73:056608. [PMID: 16803058 DOI: 10.1103/physreve.73.056608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Indexed: 05/10/2023]
Abstract
We predict the existence of lattice solitons made of incoherent white light: lattice solitons made of light originating from an ordinary incandescent light bulb. We find that the intensity structure and spatial power spectra associated with different temporal frequency constituents of incoherent white-light lattice solitons (IWLLSs) arrange themselves in a characteristic fashion, with the intensity structure more localized at higher frequencies, and the spatial power spectrum more localized at lower frequencies; the spatial correlation distance is larger at lower frequency constituents of IWLLSs. This characteristic shape of incoherent white-light lattice solitons reflects the fact that diffraction is stronger for lower temporal frequency constituents, while higher frequencies experience stronger effective nonlinearity and deeper lattice structure.
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Buljan H, Segev M, Vardi A. Incoherent matter-wave solitons and pairing instability in an attractively interacting Bose-Einstein condensate. PHYSICAL REVIEW LETTERS 2005; 95:180401. [PMID: 16383877 DOI: 10.1103/physrevlett.95.180401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2004] [Revised: 04/08/2005] [Indexed: 05/05/2023]
Abstract
The dynamics of matter-wave solitons in Bose-Einstein condensates (BEC) is considerably affected by the presence of a thermal cloud and the dynamical depletion of the condensate. Our numerical results, based on the time-dependent Hartree-Fock-Bogoliubov theory, demonstrate the collapse of the attractively interacting BEC via collisional emission of atom pairs into the thermal cloud, which splits the (quasi-one-dimensional) BEC soliton into two partially coherent solitonic structures of opposite momenta. These incoherent matter waves are analogous to optical random-phase solitons.
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Buljan H, Cohen O, Fleischer JW, Schwartz T, Segev M, Musslimani ZH, Efremidis NK, Christodoulides DN. Random-phase solitons in nonlinear periodic lattices. PHYSICAL REVIEW LETTERS 2004; 92:223901. [PMID: 15245225 DOI: 10.1103/physrevlett.92.223901] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2003] [Indexed: 05/24/2023]
Abstract
We predict the existence of random phase solitons in nonlinear periodic lattices. These solitons exist when the nonlinear response time is much longer than the characteristic time of random phase fluctuations. The intensity profiles, power spectra, and statistical (coherence) properties of these stationary waves conform to the periodicity of the lattice. The general phenomenon of such solitons is analyzed in the context of nonlinear photonic lattices.
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Buljan H, Siber A, Soljacić M, Schwartz T, Segev M, Christodoulides DN. Incoherent white light solitons in logarithmically saturable noninstantaneous nonlinear media. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 68:036607. [PMID: 14524912 DOI: 10.1103/physreve.68.036607] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2003] [Indexed: 05/24/2023]
Abstract
We analytically demonstrate the existence of white light solitons in logarithmically saturable noninstantaneous nonlinear media. This incoherent soliton has elliptic Gaussian intensity profile, and elliptic Gaussian spatial correlation statistics. The existence curve of the soliton connects the strength of the nonlinearity, the spatial correlation distance as a function of frequency, and the characteristic width of the soliton. For this soliton to exist, the spatial correlation distance must be smaller for larger temporal frequency constituents of the beam.
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Bronski JC, Segev M, Weinstein MI. Mathematical frontiers in optical solitons. Proc Natl Acad Sci U S A 2001; 98:12872-3. [PMID: 11687646 PMCID: PMC60789 DOI: 10.1073/pnas.231499298] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
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 arisen in new and exciting contexts that differ in many ways from the original context of coherent propagation in a uniform medium. We review recent developments in incoherent spatial solitons and in gap solitons in periodic structures.
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Uzdin R, Segev M, Salamo GJ. Theory of self-focusing in photorefractive InP. OPTICS LETTERS 2001; 26:1547-1549. [PMID: 18049658 DOI: 10.1364/ol.26.001547] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We present a theory of self-focusing and solitons in photorefractive InP, including the previously unexplained intensity resonance and the resonant enhancement of the space-charge field.
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Pigier C, Uzdin R, Carmon T, Segev M, Nepomnyaschchy A, Musslimani ZH. Collisions between (2+1)D rotating propeller solitons. OPTICS LETTERS 2001; 26:1577-1579. [PMID: 18049668 DOI: 10.1364/ol.26.001577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We study theoretically the collisions between (2+1)D rotating-dipole-type bimodal solitons and find that such interactions exhibit many interesting exchanges of angular momentum.
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Carmon T, Uzdin R, Pigier C, Musslimani ZH, Segev M, Nepomnyashchy A. Rotating propeller solitons. PHYSICAL REVIEW LETTERS 2001; 87:143901. [PMID: 11580651 DOI: 10.1103/physrevlett.87.143901] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2000] [Indexed: 05/23/2023]
Abstract
We demonstrate experimentally and theoretically (both analytically and numerically) a new type of spatial soliton: a rotating "propeller" soliton. This is a composite soliton made of a rotating dipole component jointly trapped with a bell-shaped component. We observe as much as 239 degrees of rotation over 13 mm of propagation (6.5 diffraction lengths).
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