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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Tunable Anderson localization in disorder graphene sheet arrays.

Yi Xu, Hai-dong Deng

    Optics Letters
    |February 25, 2016
    PubMed
    Summary

    Researchers found Anderson localization in coupled monolayer graphene waveguide arrays. Disorder in coupling strength and gate voltage control wave propagation, enabling tailored electromagnetic wave manipulation.

    Area of Science:

    • Physics
    • Materials Science
    • Optoelectronics

    Background:

    • Coupled waveguide arrays are essential for optical signal processing.
    • Graphene's unique electronic properties offer novel ways to control light propagation.
    • Anderson localization is a phenomenon where waves become trapped due to disorder.

    Purpose of the Study:

    • To investigate Anderson localization in coupled monolayer graphene waveguide arrays (CMGWAs).
    • To explore the influence of disorder in coupling strength on localization properties.
    • To demonstrate the electric tunability of Anderson localization in CMGWAs.

    Main Methods:

    • Theoretical analysis of electromagnetic wave propagation in CMGWAs.
    • Introduction of disorder in coupling strength between adjacent waveguides.

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  • Full vectorial simulations incorporating graphene's tunable surface conductivity.
  • Analysis of Anderson localization modes in the strong coupling regime.

    • Main Results:

    • Anderson localization was observed in CMGWAs with disordered coupling strengths.
    • Statistical parameters of disordering coupling strength allow tailoring of Anderson localization modes.
    • The strength of Anderson localization is controllable via applied gate voltage due to graphene's tunable conductivity.
    • Observed phenomena extend beyond the predictions of coupled-mode theory.

    Conclusions:

    • Disorder-induced Anderson localization is a viable mechanism for controlling wave propagation in CMGWAs.
    • Graphene's electric tunability provides a powerful method for manipulating Anderson localization.
    • These findings offer new possibilities for designing advanced optical devices and controlling electromagnetic waves.