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Terahertz two-cylinder waveguide coupler for transverse-magnetic and transverse-electric mode operation
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10.1063/1.3554761
/content/aip/journal/apl/98/7/10.1063/1.3554761
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/7/10.1063/1.3554761
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Cross-sections of (a) standard PPWG with cylindrical silicon lenses for coupling. (b) two-cylinder waveguide coupler for which adiabatic wave compression is used for coupling through the subwavelength gap.

Image of FIG. 2.
FIG. 2.

Amplitude transmission of the two-cylinder coupler with TM-polarization for different gap widths. For clarity some of the curves have been lifted as follows: curve , curve , curve , and curve . For small gaps single TEM-mode propagation is observed, while for larger gaps propagation also occurs above the indicated cut-off frequencies.

Image of FIG. 3.
FIG. 3.

Amplitude transmission of the two-cylinder coupler for TE-polarization and different gap widths. For clarity the curves have been lifted as follows: curve , curve , and curve . The transmission turns on sharply at the cut-off frequencies. Also higher TE-modes are observed.

Image of FIG. 4.
FIG. 4.

Comparison of the transmitted terahertz pulses for the silicon lens coupled PPWG (lower trace) and the two-cylinder coupler (upper trace), both with gaps and mode propagation. Inset: corresponding spectral amplitudes.

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/content/aip/journal/apl/98/7/10.1063/1.3554761
2011-02-18
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz two-cylinder waveguide coupler for transverse-magnetic and transverse-electric mode operation
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/7/10.1063/1.3554761
10.1063/1.3554761
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