We show that Anderson localization is possible in waveguide arrays with periodically spaced defect waveguides having a lower refractive index. Such localization is mediated by Bragg reflection, and it takes place even if diagonal or off-diagonal disorder affects only defect waveguides. For off-diagonal disorder the localization degree of the intensity distributions monotonically grows with increasing disorder. In contrast, under appropriate conditions, increasing diagonal disorder may result in weaker localization.
© 2012 Optical Society of America
Original Manuscript: June 25, 2012
Revised Manuscript: August 8, 2012
Manuscript Accepted: August 22, 2012
Published: September 20, 2012
Valery E. Lobanov, Yaroslav V. Kartashov, Victor A. Vysloukh, and Lluis Torner, "Anderson localization in Bragg-guiding arrays with negative defects," Opt. Lett. 37, 4020-4022 (2012)