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HL: Fachverband Halbleiterphysik

HL 23: Plasmonics and Nanophotonics I (Joint Session with DS/O)

HL 23.10: Vortrag

Dienstag, 23. März 2010, 12:45–13:00, H2

Surface Plasmon Resonance Coupling on Magnetically Capped Gold Nanorods — •Gillian Doyle and Dominic Zerulla — Plasmonic and Ultrafast Optics Group, School of Physics, University College Dublin, Belfield, Dublin 4, Ireland

Nanorods compared to their spherical counterparts exhibit enhanced sensitivity and are used for a wide variety of applications from bio-sensing to solar cells. The presence of two resonance peaks in their scattering spectra allows their two geometrical axes, the longitudinal and transverse axes to be separately distinguished. In this research we use iron capped gold nanorods with geometrical dimensions in the range of 60 x 700 nm. Coupling of the surface plasmons between the two axes is investigated both in multiple particle and single particle experiments and the effect of the proximity of particles to each other and their associated coupling is considered. In the single particle experiments a 532 nm laser beam is used to optically trap and manipulate a nanorod, while coupling white light to the setup allows Mie Scattering Spectroscopy (MSS) to be performed on a single particle. Large sample MSS experiments provide more intense signals for detection and give an insight into phenomena occurring at the surface of the nanoparticle [1]. In addition, the intensity of the scattering cross section by these nanorods is examined by magnetically manipulating the particles themselves and opening a novel method of optimum signal detection of SP resonances on nanorods.

[1] G Doyle, D. Zerulla, Applied Physics A, Vol 89, No. 2, 2007