Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Coupled Nanostructures and Light Localization

O 50.10: Vortrag

Mittwoch, 18. März 2015, 12:45–13:00, MA 043

Observation of Anderson localization in disordered plasmonic waveguide arrays — •Tim Vogler, Felix Bleckmann, and Stefan Linden — Physikalisches Institut, Nussallee 12, 53115 Bonn

Evanescently coupled waveguide arrays have become important model systems to investigate the evolution of coherent waves in complex structures. Here, we use arrays of dielectric loaded surface plasmon polariton waveguides (DLSPPWs) to study the propagation of surface plasmon polaritons (SPPs) in disordered media. The DLSPPWs consist of dielectric ridges that are deposited by negative-tone gray-scale electron beam lithography on top of a gold film. Disorder is intentionally introduced by either varying the heights of the individual DLSPPWs (on-diagonal disorder) or by varying their separations (off-diagonal disorder). The evolution of the SPP intensity inside of the arrays is monitored by leakage radiation microscopy. We observe a cross-over from discrete diffraction to Anderson localization as we increase the degree of disorder. Our experimental results are in excellent agreement with theoretical predictions from condensed matter physics and numerical calculations based on the coupled mode theory.