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Anderson Localization

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Mordechai Segev – 1st expert on this subject based on the ideXlab platform

  • observation of Anderson Localization in disordered nanophotonic structures
    Science, 2017
    Co-Authors: Hanan Herzig Sheinfux, Guy Bartal, Yaakov Lumer, Guy Ankonina, Azriel Z Genack, Mordechai Segev

    Abstract:

    Anderson Localization is an interference effect crucial to the understanding of waves in disordered media. However, Localization is expected to become negligible when the features of the disordered structure are much smaller than the wavelength. Here we experimentally demonstrate the Localization of light in a disordered dielectric multilayer with an average layer thickness of 15 nanometers, deep into the subwavelength regime. We observe strong disorder-induced reflections that show that the interplay of Localization and evanescence can lead to a substantial decrease in transmission, or the opposite feature of enhanced transmission. This deep-subwavelength Anderson Localization exhibits extreme sensitivity: Varying the thickness of a single layer by 2 nanometers changes the reflection appreciably. This sensitivity, approaching the atomic scale, holds the promise of extreme subwavelength sensing.

  • Anderson Localization of light in spectrally-tailored disordered potentials
    2017 Conference on Lasers and Electro-Optics (CLEO), 2017
    Co-Authors: Alex Dikopoltsev, Hanan Herzig Sheinfux, Mordechai Segev

    Abstract:

    We demonstrate, against current knowledge, that Anderson Localization can occur for wavepackets outside the spectral extent of the disordered potential, mediated by second order transitions.

  • Anderson Localization of light
    Nature Photonics, 2013
    Co-Authors: Mordechai Segev, Yaron Silberberg, Demetrios N. Christodoulides

    Abstract:

    The Anderson Localization of light within disordered media has become a topic of great interest in recent years. Here the characterization of the effect and its related phenomena are reviewed, with a discussion on the role that nonlinearity and quantum correlated photons can play.

G Modugno – 2nd expert on this subject based on the ideXlab platform

  • measurement of the mobility edge for 3d Anderson Localization
    Nature Physics, 2015
    Co-Authors: G Semeghini, M Inguscio, M Fattori, M Landini, P Castilho, G Spagnolli, Andreas Trenkwalder, G Modugno

    Abstract:

    The mobility edge characterizes the transition from Localization to diffusion. This key parameter in Anderson Localization was measured for a system of ultracold atoms in a tunable disordered potential created by laser speckles.

  • Anderson Localization in bose einstein condensates
    Reports on Progress in Physics, 2010
    Co-Authors: G Modugno

    Abstract:

    The understanding of disordered quantum systems is still far from being complete, despite many decades of research on a variety of physical systems. In this review we discuss how Bose–Einstein condensates of ultracold atoms in disordered potentials have opened a new window for studying fundamental phenomena related to disorder. In particular, we direct our attention to recent experimental studies on Anderson Localization and on the interplay of disorder and weak interactions. These realize a very promising starting point for a deeper understanding of the complex behaviour of interacting, disordered systems.

  • Anderson Localization of a non interacting bose einstein condensate
    Nature, 2008
    Co-Authors: G Roati, C Derrico, L Fallani, M Fattori, C Fort, M Zaccanti, G Modugno, M Modugno, M Inguscio

    Abstract:

    Anderson Localization of waves in disordered media was originally predicted fifty years ago, in the context of transport of electrons in crystals. The phenomenon is much more general and has been observed in a variety of systems, but never directly for matter waves. The authors use a non-interacting Bose–Einstein condensate of ultracold atoms to study Anderson Localization. The effect is clearly demonstrated through investigations of the transport properties and spatial and momentum distributions. The highly controllable nature of the system may render it useful for investigations of the interplay between disorder and interaction, and to uncover exotic quantum phases. Anderson Localization of waves in disordered media was originally predicted1 fifty years ago, in the context of transport of electrons in crystals2. The phenomenon is much more general3 and has been observed in a variety of systems, including light waves4,5. However, Anderson Localization has not been observed directly for matter waves. Owing to the high degree of control over most of the system parameters (in particular the interaction strength), ultracold atoms offer opportunities for the study of disorder-induced Localization6. Here we use a non-interacting Bose–Einstein condensate to study Anderson Localization. The experiment is performed with a one-dimensional quasi-periodic lattice—a system that features a crossover between extended and exponentially localized states, as in the case of purely random disorder in higher dimensions. Localization is clearly demonstrated through investigations of the transport properties and spatial and momentum distributions. We characterize the crossover, finding that the critical disorder strength scales with the tunnelling energy of the atoms in the lattice. This controllable system may be used to investigate the interplay of disorder and interaction (ref. 7 and references therein), and to explore exotic quantum phases8,9.

Arash Mafi – 3rd expert on this subject based on the ideXlab platform

  • Disordered Anderson Localization Optical Fibers for Image Transport – A Review
    arXiv: Optics, 2019
    Co-Authors: Arash Mafi, John Ballato, Karl W. Koch, Axel Schülzgen

    Abstract:

    Disordered optical fibers show novel waveguiding properties, enabled by the transverse Anderson Localization of light, and are used for image transport. The strong transverse scattering from the transversely disordered refractive index structure results in transversely confined modes that can freely propagate in the longitudinal direction. In some sense, an Anderson Localization disordered fiber behave like a large-core multimode optical fiber, with the advantage, that most modes are highly localized in the transverse plane, so any point in the cross section of the fiber can be used for localized beam transport. This property has been used for high-quality transportation of intensity patterns and images in these optical fibers. This review covers the basics and the history of the transverse Anderson Localization in disordered optical fibers and captures the recent progress in imaging applications using these optical fibers.

  • Disordered Anderson Localization Optical Fibers for Image Transport—A Review
    Journal of Lightwave Technology, 2019
    Co-Authors: Arash Mafi, John Ballato, Karl W. Koch, Axel Schülzgen

    Abstract:

    Disordered optical fibers show novel waveguiding properties, enabled by the transverse Anderson Localization of light, and are used for image transport. The strong transverse scattering from the transversely disordered refractive index structure results in transversely confined modes that can freely propagate in the longitudinal direction. In some sense, an Anderson Localization disordered fiber behave like a large-core multimode optical fiber, with the advantage that most modes are highly localized in the transverse plane, so any point in the cross section of the fiber can be used for localized beam transport. This property has been used for high-quality transportation of intensity patterns and images in these optical fibers. This review covers the basics and the history of the transverse Anderson Localization in disordered optical fibers and captures the recent progress in imaging applications using these optical fibers.

  • Image Transport through Anderson Localization
    2018 IEEE Photonics Society Summer Topical Meeting Series (SUM), 2018
    Co-Authors: Arash Mafi

    Abstract:

    Anderson Localization has been a subject of intense research for sixty years. It is highly desirable to harness its curious and interesting properties in practical applications. I will survey recent advances in this direction by using this phenomenon for high-quality image transport in optical fibers.