Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Particles and Clusters II

O 50.3: Vortrag

Donnerstag, 29. März 2007, 11:45–12:00, H38

Arbitrary-order sum frequency generation scattering from spherical particles — •Sylvie Roke — Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart

Nonlinear optical processes have been widely applied to study materials. The most commonly used techniques rely on second-order processes, such as second harmonic (SHG) and sum frequency generation (SFG). Consequently, SHG, SFG and some higher order techniques (like THG and CARS) have been developed into well-established spectroscopic and microscopic techniques that probe the optical interface- and bulk properties of materials. SHG, SFG and THG have recently been performed in a scattering geometry, in which the interfaces (and bulk) of (nano) particles in solution or embedded in composites can be probed in-situ. This enables one to combine the fields of soft matter and surface science.

To better understand these new developments, we have calculated the expressions for arbitrary-order sum frequency scattering from small particles. We calculate the full 3-dimensional scattering pattern for the case of second-order scattering and specify the selection rules and relations that relate the molecular structure to the scattering process. From these expressions, we can derive useful insights into how molecular order, orientation, and chirality appear in the scattering pattern.