Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.23: Poster

Dienstag, 8. März 2005, 16:30–19:00, Poster TU F

Photonic Crystal Microwave Resonators for Magnetic Resonance Applications — •A. von Rhein, E. von Rhein, M. Wanjek, and S. Greulich-Weber — Universität Paderborn, Department Physik, Warburger Straße 100, 33098 Paderborn

Electron paramagnetic resonance and multiple resonance techniques like electron nuclear double resonance and optically detected magnetic resonance are powerful tools for the investigation of defects in solids. Recently high frequency sources (100 GHz) at reasonable costs became available for magnetic resonance (MR) spectroscopy providing higher spectral resolution and in principle higher sensitivity compared to lower frequencies. Usually the microwave absorption due to the MR signal is measured using a microwave bridge balanced by a microwave resonator containing the sample. At high frequencies the resonator becomes rather small which requires the development of new resonator designs. Especially for optical detection of MR optical access to the sample is needed which at high frequencies only allows the use of Fabry-Perot resonators, which provide relatively small quality factors. We present new resonator designs on the basis of photonic crystals also suitable for low frequency MR providing additional features not known from conventional resonators.