Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Photonics II
Q 16.3: Talk
Monday, March 18, 2013, 17:00–17:15, A 310
Directional emission of dielectric disks with a finite scatterer in the THz regime — •J. Evers1, S. I. Schmid1, S. Preu2, F. Sedlmeir3,4, G. Leuchs3,4, and H. G. L. Schwefel3,4 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg — 2Lehrstuhl für Angewandte Physik, Universität Erlangen-Nürnberg, D-91058 Erlangen — 3Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, D-91058 Erlangen — 4Max-Planck-Institut für die Physik des Lichts, D-91058 Erlangen
Directional emission of a whispering gallery mode resonator perturbed by a small hole acting as a scatterer in the vicinity of the resonator edge is discussed. We model the setup using finite-difference time-domain (FDTD) calculations of the electromagnetic field in a spatial region containing the resonator, but not the detector placed at larger distance in the far field. We then extrapolate the detection signal based on a Poynting vector analysis of the FDTD data. The numerical predictions agree well to experimental data obtained with cm scale resonators in the Terahertz domain.