Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 98: Plasmonics and Nanooptics V
O 98.6: Vortrag
Freitag, 4. April 2014, 11:45–12:00, TRE Ma
Fano resonances in T-like configured nanospheroids — •Manuel Gonçalves1, Taron Makaryan2, Hayk Minassian3, Armen Melikyan4, and Othmar Marti1 — 1Ulm University - Inst. of Experimental Physics, Ulm, Germany — 2Yerevan State University - Radiophysics Department, Yerevan Armenia — 3Yerevan Physics Institute, Yerevan, Armenia — 4Russian-Armenian (Slavonic) University, Yerevan, Armenia
Nowadays the growing interest towards systems of metallic nanoparticles is often conditioned by the possibility of revealing Fano resonancies in surface plasmon (SP) oscillations. In this communication we consider plasmonic coupling effects in metallic spheroidal nanoparticles when they form T-like configuration. While identical spheroids do not present Fano resonances, proper choice of aspect ratios of non identical spheroids makes possible strong dipole-quadrupole coupling. When the length of the horizontal spheroid is approximately twice of the length of vertical one Fano resonance takes place if the incident light is polarized along the vertical spheroid and leads of pronounced atenuation in the scattering. Calculations were carried out using COMSOL Multiphysics software for Au spheroids of several aspect ratios and interparticle separations. At the Fano resonance, calculations of near field distribution show that the energy of surface plasmon (SP) oscillations is mainly concentrated in the horizontal spheroid. It is important to note that due to the symmetry of the system the dipole moment of horizontal spheroid vanishes, and the radiation losses are conditioned only by the SP oscillations in the vertical one.