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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 9 — Sep. 1, 2009
  • pp: A6–A13

An investigation of the lowest-order transverse-electric ( TE 1 ) mode of the parallel-plate waveguide for THz pulse propagation

Rajind Mendis and Daniel M. Mittleman  »View Author Affiliations


JOSA B, Vol. 26, Issue 9, pp. A6-A13 (2009)
http://dx.doi.org/10.1364/JOSAB.26.0000A6


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Abstract

We experimentally and theoretically investigate the lowest-order transverse-electric ( TE 1 ) mode of the parallel-plate waveguide (PPWG) for the propagation of broadband THz pulses. We demonstrate undistorted THz pulse propagation via the single TE 1 mode, solving the group-velocity-dispersion and spectral-filtering problems caused by the mode’s low-frequency cutoff. We observe a remarkable counterintuitive property of the TE 1 mode: its attenuation decreases with increasing frequency for all frequencies above cutoff. This phenomenon has not been observed with any other THz waveguide to date, and it can enable extremely low-loss propagation. We present a physical interpretation of this frequency-dependent behavior using a simple plane-wave description of the TE 1 mode propagation. We also find that it is possible to achieve almost 100% coupling to the TE 1 mode from a focused free-space Gaussian beam. In addition, using the above plane-wave analysis, we show how to mitigate the diffraction losses inherent to long path-length PPWGs via the use of transverse-concave plates.

© 2009 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(320.5390) Ultrafast optics : Picosecond phenomena
(320.5540) Ultrafast optics : Pulse shaping

History
Original Manuscript: February 2, 2009
Manuscript Accepted: March 10, 2009
Published: April 27, 2009

Citation
Rajind Mendis and Daniel M. Mittleman, "An investigation of the lowest-order transverse-electric (TE1) mode of the parallel-plate waveguide for THz pulse propagation," J. Opt. Soc. Am. B 26, A6-A13 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-9-A6


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