Directional Emission of Dielectric Disks with a Finite Scatterer in the THz Regime
arXiv:1303.1650 · doi:10.1364/OE.21.016370
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.
References in corpus (4)
- Cavity QED treatment of scattering-induced efficient free-space excitation and collection in high-Q whispering-gallery microcavities
- Pathway interference in a loop array of three coupled microresonators
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Cited by in corpus (4)
- Ultra-high Q terahertz whispering-gallery modes in a silicon resonator
- Terahertz whispering gallery mode bubble resonator
- Optimization of conformal whispering gallery modes in limaçon-shaped transformation cavities
- Quasi-polygonal Conformal Mappings for Designing Whispering Gallery Modes of Multiple Direction Emission