Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 61: Photonics II
Q 61.7: Vortrag
Freitag, 21. März 2014, 15:30–15:45, UDL HS3038
Waveguide coupling of high index whispering gallery mode resonators in the THz domain — •Martin F. Schneidereit1, Florian Sedlmeir1,2,3, Sascha Preu4, Antti V. Raisanen5, Luis Enrique García-Muñoz6, Gerd Leuchs1,2, and Harald G. L. Schwefel1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Intitute for Optics, Information and Photonics, Univ. of Erlangen-Nuremberg, Germany — 3SAOT, School of Adv. Opt. Technologies, Univ. of Erlangen-Nuremberg, Germany — 4Chair of Applied Physics, Univ. of Erlangen-Nuremberg, Germany — 5Aalto Univ. Finland — 6Univ. Carlos III de Madrid, Spain
Whispering Gallery Mode resonators (WGMs) have high Q factors and small modal volumes and can thus show strong nonlinear interactions. Furthermore, they are used as passive narrow-band filters and as frequency references. The evanescent coupling process of optical light into WGMs is straightforward. For THz radiation however, it proves a challenge as many interesting materials have high refractive bulk indices of 3 to 6, but high index coupling devices are not yet well established. In our experiments we investigate the influence of the geometry and coupling distance with respect to their impact on the coupling process. Our approach is to match the effective refractive indices between coupler and WGM by using their respective geometric dispersions. In the experiments we used a photomixing THz source, directly attached to a tapered GaAs waveguide, which then couples to a high index WGM resonator. Due to the long wavelengths of sub-THz and THz light, the coupling distance and the geometrical shape are rather easy to control.