Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.46: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Fano resonances in plasmonic nanostructures — •Manuel Gonçalves and Othmar marti — Ulm University - Inst. of Experimental Physics, Albert-Einstein-Allee 11, 89069 Ulm, Germany

Fano resonances arise from the interference between a resonant process and the continuum (background) [1]. Recently, it was found that resonances in plasmonic nanostructures may also give rise to asymmetric resonance line shapes (Fano modes) [2]. These modes arise from interferences between electric dipole resonances, between electric dipole and quadrupole and, in some cases, between electric dipole and magnetic dipole. On the other hand, resonant modes in arrays of gold nanospheres have pronounced dips in the transmission spectrum and large figure of merit (FOM)[3]. These resonances are very sensitive to changes in the refractive index of the medium and are therefore good candidates for sensing applications.

We present a study of the Fano resonances in several plasmonic nanostructures, using the finite-element method (COMSOL Multiphysics). The dependence of the resonances on the excitation conditions, shape, size of the nanostructures and embedding medium was investigated.

[1] U. Fano, Phys. Rev., 124 1866 (1961).

[2] B. Lukyanchuk et al., Nature Materials, 9 707 (2010).

[3] Arseniy I. Kuznetsov et al., ACS Nano, 5 4843 (2011).