Observation of transverse coherent backscattering in disordered photonic structures

Martin Boguslawski, Sebastian Brake, Daniel Leykam, Anton S. Desyatnikov, Cornelia Denz

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Coherent backscattering, also referred to as weak localization, is an exciting multidisciplinary phenomenon that appears in disordered systems of multiple coherent-wave scattering. Providing proper scattering conditions in (2 + 1) dimensional randomized photonic systems, we optically implement, observe, and analyse transverse coherent backscattering. Ensembles of disordered wave-guide structures are prepared by random-intensity nondiffracting writing entities according to the beam's intensity distribution. The structure size of the induced potentials naturally define an effective mobility edge, and thus, we identify a crucial impact of the plane probe waves' spatial frequency on the strength and shape of the spectral coherent backscattering signal. We additionally observe transverse elastic scattering as a precursor of weak localization. To testify the coherent character as a fundamental condition for coherent backscattering, we propose a scheme to continuously reduce the spatial coherence of the probe beam which directly reduces the degree of localization and coherent backscattering. With our experiments, we propose a testing platform that allows comprehensive examination of coherent backscattering with a broad set of preparation parameters and under uncritical laboratory conditions. Our results are directly transferable to more complex systems of disordered wave potentials, not being restricted to photonic systems.

    Original languageEnglish
    Article number10439
    JournalScientific Reports
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - Dec 1 2017

    ASJC Scopus subject areas

    • General

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