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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 7 — Apr. 1, 2014
  • pp: 1807–1810

Optically induced mode coupling and interference in a terahertz parallel plate waveguide

Lauren Gingras, Marcel Georgin, and David G. Cooke  »View Author Affiliations


Optics Letters, Vol. 39, Issue 7, pp. 1807-1810 (2014)
http://dx.doi.org/10.1364/OL.39.001807


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Abstract

We demonstrate all-optical control of terahertz (THz) wavemode coupling in a silicon-filled parallel plate waveguide. Using an asymmetric photoexcitation of charge carriers on the surface of the silicon slab within the waveguide, the symmetry is broken, and THz light is partially coupled from TEM to higher-order TM modes. The resulting interference between these modes and the residual TEM mode leads to a strong frequency-dependent transmission modulation. This frequency-selective modulation is widely tunable by adjusting the relative modal phases by translating the excitation along the propagation direction. The experimental observations are well described by a numerical and analytic model of modal interference.

© 2014 Optical Society of America

OCIS Codes
(230.4110) Optical devices : Modulators
(230.7390) Optical devices : Waveguides, planar
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Optical Devices

History
Original Manuscript: January 8, 2014
Manuscript Accepted: February 10, 2014
Published: March 20, 2014

Citation
Lauren Gingras, Marcel Georgin, and David G. Cooke, "Optically induced mode coupling and interference in a terahertz parallel plate waveguide," Opt. Lett. 39, 1807-1810 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-7-1807


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