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Inhibition of light tunneling in waveguide arrays

: Szameit, A.; Kartashov, Y.V.; Dreisow, F.; Heinrich, M.; Pertsch, T.; Nolte, S.; Tünnermann, A.; Vysloukh, V.A.; Lederer, F.; Torner, L.


Physical review letters 102 (2009), Nr.15, Art. 153901, 4 S.
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer IOF ()

We report the observation of almost perfect light tunneling inhibition at the edge and inside laser-written waveguide arrays due to band collapse. When the refractive index of the guiding channels is harmonically modulated along the propagation direction and out-of-phase in adjacent guides, light is trapped in the excited waveguide over a long distance due to resonances. The phenomenon can be used for tuning the localization threshold power.