Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Transport and Confinement II

CPP 24.2: Talk

Tuesday, April 1, 2014, 15:15–15:30, ZEU 260

Thermal Diffusivity Measured with a Single Nanoparticle — •André Heber, Markus Selmke, and Frank Cichos — Molecular Nano-photonics Group, Universität Leipzig, Germany

The thermal transport properties in soft matter and biological systems are of high fundamental interest. As these materials are highly heterogeneous spatially resolved measurements such as thermal diffusivity measurements are necessary to gain detailed insights. In addition far-field optical read out is desired to minimize perturbations. We use a single metallic nanoparticle that is heated by an intensity modulated resonant laser beam. This results in a thermal wave around the particle and an accompanying refractive change. The change in the refractive index is detected by a weakly absorbed laser beam. Utilizing recent progress in single particle photothermal microscopy we are able to deduce the thermal diffusivity from the action of the thermal wave on the detection laser. With single particle photothermal microscopy it is possible to measure thermal conductivities in a great variety of materials. This scheme can easily be implemented into conventional optical microscopes.