Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 8: Photonische Kristalle II

HL 8.1: Vortrag

Montag, 8. März 2004, 15:15–15:30, H15

Microwave resonators for the optical detection of magnetic resonance on the basis of photonic crystals — •M. Wanjek, E. Waldmueller, and S. Greulich-Weber — University of Paderborn, Fakulty of Science, Physics Department, D-33098 Paderbron, Germany

Electron paramagnetic resonance (EPR) is an important tool for the study of the microscopic and electronic structure of defects in solids. Via the optical detection of magnetic resonance(ODMR) the optical properties of a defect can be related to its microscopic structure. Since today often only small samples are available (e.g. epi layers) the sensitivity of EPR has to be increased. In this regard efforts have been made to use high frequencies, e.g. measuring EPR at 95 GHz instead of 9.5 GHz. Usually EPR is measured using a microwave bridge with a microwave resonator containing the sample. At low frequencies cylindrical or rectangular resonators are used providing also sufficient space for field modulation coils. At high frequencies the resonator becomes considerably smaller supplying no space for field coils. External field coils would be shielded by the metallic resonator itself. Furthermore for ODMR optical access to the sample is needed, which can not be realized with usual resonators. High frequency microwave resonator designs fitting to all requirements will be presented on the basis of photonic crystals.