Abstract
We experimentally demonstrate the Anderson localization of surface plasmon polaritons (SPPs) at optical frequencies in two-dimensional (2D) nanostructures. By increasing the positional disorder of the silver nanohole arrays on a glass substrate, strong 2D localization of SPPs appears with an exponentially decreased electric field, the reduced propagation length and the rapid disappearance of the autocorrelation coefficient. Moreover, we manage to realize the localized SPP-photon-exciton interactions in the 2D disordered silver nanoarrays combined with fluorescent dye molecules. Due to the disorder in the nanoarray, the collected photoluminescence from fluorescent dye molecules is enhanced by over 3 orders of magnitude comparing to that on the silver film without nanostructures. Our study extends Anderson localization of SPPs at visible regime to 2D disordered systems, and provides a unique way to enhance light-matter interaction in SPP-based nanodevices.
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