Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 1: Application of Thin Films
DS 1.6: Vortrag
Montag, 31. März 2014, 10:45–11:00, CHE 91
Phonon Blocking in Multilayers produced by Pulsed Laser Deposition — •Florian Döring1, Christian Eberl1, Anna Major1, Susanne Schlenkrich1, Felix Schlenkrich1, Martin Lüttich2, Maria Mansurova2, Benjamin Lenk2, Sarah Hoffmann3, Markus Münzenberg2, and Hans-Ulrich Krebs1 — 1Institute for Materials Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 21st Institute of Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 3Institute for x-ray physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
Multilayer insulations are a modern high-technology approach for minimizing thermal transport, which is important for thermoelectric materials, thermal barrier coatings, solid state refridgerators and cryogenic applications. In these multilayer structures, the thermal conductivity can be reduced by an increasing number of interfaces between two materials with a high acoustic mismatch resulting in different phonon dispersion relations. Therefore, different types of multilayers, consisting of various metals (e.g. W, Ti, or Cu), oxides (e.g. ZrO2 or MgO) and polymers (e.g. PC), were selected and pulsed laser deposited (PLD at 248 nm) with high quality and afterwards analysed by ultrafast pump-probe reflectivity measurements. Thereby we found fast phonon modes on ps time scales that indicate possible candidates for THz frequency band gap phononic metamaterials. In this contribution, the necessary steps for the fabrication of phononic metamaterials by PLD and first results of reflectivity measurements are discussed.