Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.37: Poster

Tuesday, March 21, 2017, 18:30–20:30, P4

Thermal Diffusivity Measurements with Single Particle Photothermal Microscopy — •André Heber and Frank Cichos — Universität Leipzig, Exp. Phys. I, Molecular Nano-Photonics Group, Leipzig, Germany

Photothermal single particle microscopy has proven to be a sensitive imaging technique for absorbing nanoparticles and molecules. Here, we discuss the extension of photothermal microscopy to the measurement of thermal diffusivities in the surroundings of an absorber. The photothermal contrast makes use of a heating induced refractive index change. As the refractive index change is small a modulated heating scheme is implemented in which the optical heating is harmonically modulated and the detection laser detects fluctuations at that particular modulation frequency. This configuration enables a high signal to noise ratio and adds a time scale for the measurement of thermal transport as the temperature profile is not instantly established. Here, we show how single particle microscopy can be used to sense anisotropies in the thermal transport and interfaces using single particle photothermal microscopy.