Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 76: Plasmonics and Nanooptics VII: Applications and Other Aspects

O 76.4: Vortrag

Mittwoch, 22. März 2017, 15:45–16:00, TRE Ma

Anderson localization in disordered plasmonic waveguide arrays — •Cherpakova Zlata, Felix Bleckmann, and Stefan Linden — Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Nußallee 12, 53115 Bonn, Germany

We report on the observation of Anderson localization in disordered arrays of evanescently coupled dielectric-loaded surface plasmon polariton (SPP) waveguides. The samples are fabricated by negative-tone gray-scale electron beam lithography. On-diagonal disorder is introduced to the arrays by randomly altering the waveguides effective refractive index which is a monotonous function of the waveguide height. Thus, by choosing the maximum variation of the waveguide height we can control the degree of disorder. SPPs were excited by shining a highly focused laser beam on the grating, deposited on top of the central waveguide. The spatial evolution of the SPP field intensity is monitored by real space leakage radiation microscopy (LRM). The corresponding momentum-resolved spectra which reveal the information on the energy spectrum of an equivalent condensed matter system is measured as well by making use of Fourier space LRM. With these techniques we experimentally demonstrate the transverse localization of the SPP with increasing degree of disorder both in real and Fourier space.