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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 16370–16380

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

S. Preu, S. I. Schmid, F. Sedlmeir, J. Evers, and H. G. L. Schwefel  »View Author Affiliations

Optics Express, Vol. 21, Issue 14, pp. 16370-16380 (2013)

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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.

© 2013 OSA

OCIS Codes
(230.5750) Optical devices : Resonators
(140.3945) Lasers and laser optics : Microcavities
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Optical Devices

Original Manuscript: March 6, 2013
Revised Manuscript: May 10, 2013
Manuscript Accepted: May 13, 2013
Published: July 2, 2013

S. Preu, S. I. Schmid, F. Sedlmeir, J. Evers, and H. G. L. Schwefel, "Directional emission of dielectric disks with a finite scatterer in the THz regime," Opt. Express 21, 16370-16380 (2013)

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