Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: Plasmonics and Nanooptics IV

O 53.10: Vortrag

Mittwoch, 24. März 2010, 17:15–17:30, H32

Characterization of Single Gold Nanoparticles Using Confocal Interference Microscopy in Combination with Higher Order Laser Modes — •Frank Wackenhut¹, Tina Züchner¹, Antonio Virgilio Failla^1,2, and Alfred J. Meixner¹ — ¹Eberhard-Karls-Universität Tübingen, Institut für Physikalische und Theoretische Chemie, Tübingen, Germany — ²Max-Planck-Institut für Entwicklungsbiologie, Tübingen, Germany

By using confocal interference microscpoy in combination with higher order laser modes it is possible to directly image the orientation and to detect the shape of single metal nanoparticles, with sizes well beyond the diffraction limit [1,2]. Metal nanoparticles can be imaged by detecting both their luminesence or the elastically scattered light. In the scattering detection mode the visualized pattern strongly depends on the local environment, e.g. the refractive index of the surrounding medium [3]. With this technique we are also able to observe and quantify dynamics in the motion of single nanoparticles [4]. Ongoing measurements show that this technique might be utilized for studying the wavelength dependence of the polarizability tensor of a single gold nanorod.

[1] A.V. Failla, H. Qian, H. Qian, A. Hartschuh, A. J. Meixner (2006), Nano Lett. 6, 1374. [2] T. Züchner, A. V. Failla, A. J. Meixner (2008), J. Microsc. 229, 337. [3] T. Züchner, A. V. Failla, M. Steiner, A. J. Meixner (2008), Opt. Expr. 16, 14635. [4] T. Züchner, F. Wackenhut, A. V. Failla, A. J. Meixner (2009), Appl. Surf. Sci. 255, 5391.