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Directional emission of dielectric disks with a finite scatterer in the THz regime

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Preu,  S.
Max Planck Fellow Group, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;

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Sedlmeir,  F.
Whispering Gallery Mode Resonator, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Schwefel,  H. G. L.
Whispering Gallery Mode Resonator, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Preu, S., Schmid, S. I., Sedlmeir, F., Evers, J., & Schwefel, H. G. L. (2013). Directional emission of dielectric disks with a finite scatterer in the THz regime. OPTICS EXPRESS, 21(14), 16370-16380. doi:10.1364/OE.21.016370.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6741-A
Abstract
In the Terahertz (THz) domain, we investigate both numerically and experimentally the directional emission of whispering gallery mode resonators that are perturbed by a small scatterer in the vicinity of the resonators rim. We determine quality factor degradation, the modal structure and the emission direction for various geometries. We find that scatterers do allow for directional emission without destroying the resonator's quality factor. This finding allows for new geometries and outcoupling scenarios for active whispering gallery mode structures such as quantum cascade lasers and passive resonators such as evanescent sensors. The experimental results agree well with finite difference time domain simulations. (C) 2013 Optical Society of America