Characterization of the terahertz near-field output of parallel-plate waveguides

Hui Zhan; Rajind Mendis; Daniel M. Mittleman

doi:10.1364/JOSAB.28.000558

Journal of the Optical Society of America B
Vol. 28,
Issue 3,
pp. 558-566
(2011)
•https://doi.org/10.1364/JOSAB.28.000558

Characterization of the terahertz near-field output of parallel-plate waveguides

Hui Zhan, Rajind Mendis, and Daniel M. Mittleman

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Hui Zhan, Rajind Mendis, and Daniel M. Mittleman, "Characterization of the terahertz near-field output of parallel-plate waveguides," J. Opt. Soc. Am. B 28, 558-566 (2011)

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Abstract

We experimentally characterize the field confinement properties of various parallel-plate waveguide (PPWG) geometries in the terahertz spectral range. In contrast to infinite-width PPWGs with free-space diffraction along the unshielded direction, finite-width (and also tapered) PPWGs show well-confined THz fields at the output facet. Both the transverse field component, perpendicular to the inside surfaces, and the longitudinal component, parallel to the propagation direction, exhibit strong lateral confinement. We also observe an antisymmetric longitudinal field distribution across the air gap, analogous to the symmetric surface plasmon polariton mode observed in optical slot waveguides.

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Waveguide	Input Width $w_{in}$	Output Width $w_{out}$	Untapered Length	Tapered Length	Total Length
S1	$1 cm$	$5 mm$	$5 cm$	$5 cm$	$10 cm$
S2	$1 cm$	$2 mm$	$5 cm$	$5 cm$	$10 cm$
S3	$1 cm$	$1 mm$	$5 cm$	$5 cm$	$10 cm$
S4	$1 cm$	$0.2 mm$	$5 cm$	$5 cm$	$10 cm$
L1	$1 cm$	$5 mm$	$5 cm$	$20 cm$	$25 cm$
L2	$1 cm$	$2 mm$	$5 cm$	$20 cm$	$25 cm$
L3	$1 cm$	$1 mm$	$5 cm$	$20 cm$	$25 cm$
L4	$1 cm$	$0.2 mm$	$5 cm$	$20 cm$	$25 cm$
M1	$1 cm$	$120 μm$	$5 cm$	$20 cm$	$25 cm$
M2	$1 cm$	$100 μm$	$5 cm$	$20 cm$	$25 cm$
M3	$1 cm$	$40 μm$	$5 cm$	$20 cm$	$25 cm$
M4	$1 cm$	$10 μm$	$5 cm$	$20 cm$	$25 cm$

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Journal of the Optical Society of America B