Suppression and restoration of disorder - induced light locali - zation mediated by - symmetry breaking

نویسندگان

  • Yaroslav V. Kartashov
  • Chao Hang
  • Vladimir V. Konotop
  • Victor A. Vysloukh
  • Guoxiang Huang
  • Lluis Torner
چکیده

We uncover that the breaking point of the  -symmetry in optical waveguide arrays has a dramatic impact on light localization induced by the off-diagonal disorder. Specifically, when the gain/loss control parameter approaches a critical value at which  -symmetry breaking occurs, a fast growth of the coupling between neighboring waveguides causes diffraction to dominate to an extent that light localization is strongly suppressed and statistically averaged width of the output pattern substantially increases. Beyond the symmetry-breaking point localization is gradually restored, although in this regime the power of localized modes grows upon propagation. The strength of localization monotonically increases with disorder at both, broken and unbroken  -symmetry.

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تاریخ انتشار 2015