Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Nanoparticles and Composite Materials

CPP 2.9: Talk

Monday, March 26, 2012, 12:00–12:15, C 243

Determination of the three-dimensional orientation of gold nanorods by in-situ measuring their elastic scattering and luminescence signal — •Frank Wackenhut¹, Antonio Virgilio Failla², Tina Züchner¹, and Alfred J. Meixner¹ — ¹Eberhard Karls University, Institute of Physical and Theoretical Chemistry, Tübingen, Germany — ²University Medical Center Hamburg-Eppendorf, Hamburg, Germany

We will demonstrate that it is possible to determine the three-dimensional orientation of a single gold nanorod (GNR) by simultaneously measuring the elastic scattering and luminescence pattern. For excitation we used radially and azimuthally polarized doughnut shaped modes (RPDM/APDM). In this work we will extend the results shown in [1] to a not index matched sample geometry. We will demonstrate that the combined acquisition of four patterns (luminescence and scattering patterns excited either by a RPDM or an APDM) allows us to determine the three-dimensional orientation of individual GNRs with high precision covering the full angular spectrum. In general the luminescence pattern is mainly used to determine the GNR orientation, while the acquisition of the scattering pattern in reflection mode permits us to gain additional information about the nano environment surrounding the GNR. This extends the results shown by Züchner et al. [2] to a 3D experimental system.

[1] F. Wackenhut, A.V. Failla, T. Züchner, A. J. Meixner, (2011). Proc. SPIE 8096 (1), 80962V. [2] T. Züchner, A. V. Failla, M. Steiner, A. J. Meixner, (2008). Opt. Express, 16; 14635-14644.