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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 30 — Oct. 20, 2002
  • pp: 6507–6513

Grating-assisted coupling of terahertz waves into a dielectric waveguide studied by terahertz time-domain spectroscopy

Jean-François Roux, Fabien Aquistapace, Frédéric Garet, Lionel Duvillaret, and Jean-Louis Coutaz  »View Author Affiliations


Applied Optics, Vol. 41, Issue 30, pp. 6507-6513 (2002)
http://dx.doi.org/10.1364/AO.41.006507


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Abstract

We report on the efficient coupling of terahertz (THz) waves into a dielectric waveguide by means of a diffraction grating engraved at the top of the waveguide. The waveguide is made of a 201-µm-thick high-resistivity silicon wafer. The transmission of the device, measured versus frequency by terahertz time-domain spectroscopy, shows usual m lines when a frequency component of the THz pulse spectrum satisfies the phase-matching condition and is coupled into the waveguide. The experimental data are well modeled with the differential electromagnetic method to compute the diffraction pattern of the grating device. The dispersion curve of the first four modes of propagation is determined from the frequency position of the m lines recorded for different angles of incidence of the THz beam. The waveguide exhibits a weak group velocity dispersion at high frequencies.

© 2002 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(230.7370) Optical devices : Waveguides
(260.3090) Physical optics : Infrared, far
(300.6270) Spectroscopy : Spectroscopy, far infrared
(320.7120) Ultrafast optics : Ultrafast phenomena
(350.4010) Other areas of optics : Microwaves

History
Original Manuscript: January 18, 2002
Revised Manuscript: June 25, 2002
Published: October 20, 2002

Citation
Jean-François Roux, Fabien Aquistapace, Frédéric Garet, Lionel Duvillaret, and Jean-Louis Coutaz, "Grating-assisted coupling of terahertz waves into a dielectric waveguide studied by terahertz time-domain spectroscopy," Appl. Opt. 41, 6507-6513 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-30-6507


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References

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