Dresden 2011 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 18: Applications of dielectric solids

DF 18.3: Vortrag

Donnerstag, 17. März 2011, 16:40–17:00, MÜL Elch

CVD Diamond for sub-mm and THz applications — •Theo Scherer, Dirk Strauss, and Andreas Meier — Karlsruhe Institute of Technology KIT ; IMF-1 Hermann-von-Helmholtz-Platz 1 D-76344 Eggenstein-Leopoldshafen, Germany

Diamond is an outstanding material with a extremely high thermal conductivity and a very low loss tangent of < 10-5 for GHz frequencies and shows therefore a very small microwave absorption. To understand the loss mechanisms at the surface and in the bulk material of diamond the determination of loss tangent in dependence of the frequency in the range of several GHz up to THz is essential. The main absorption mechanisms for ultra-low loss materials will be described and prospects will be given for advancing these materials in the THz region. A reduction of the losses at the surface can be realized by special chemical treatment and surface finishing of the CVD diamond disk material. Resonator measurements and experimental setups for the GHz- and the THz-range will be discussed.