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19 February 2014 Anderson localized modes in a disordered glass optical fiber
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A beam of light can propagate in a time-invariant transversely disordered waveguide because of transverse Anderson localization. We developed a disordered glass optical ber from a porous artisan glass (satin quartz). The refractive index pro le of the disordered glass optical ber is composed of a non-uniform distribution of air voids which can be approximated as longitudinally invariant. The ll-fraction of air voids is higher at the regions closer to the boundary compared with the central regions. The experimental results show that the beam radius of a localized beam is smaller at the regions closer to the boundary than the one at the central regions. In order to understand the reason behind these observations, the fully vectorial modes of the disordered glass ber are calculated using the actual scanning electron microscope image of the ber tip. The numerical calculations show that the modes at regions closer to the boundary of the ber are more localized compared with the modes at the central regions. Coupling of an input beam to the less-localized modes with large tails at the central regions of the ber results in a large beam radius. In comparison, a beam of light launched at the regions close to the boundary couples to the highly compact modes of the ber and results in a small localized beam radius.
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Salman Karbasi, Seyedrasoul Hosseini, Karl W. Koch, Thomas Hawkins, John Ballato, and Arash Mafi "Anderson localized modes in a disordered glass optical fiber", Proc. SPIE 8994, Photonic and Phononic Properties of Engineered Nanostructures IV, 899420 (19 February 2014);


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