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Terahertz two-cylinder waveguide coupler for transverse-magnetic and transverse-electric mode operation

: Theuer, M.; Shutler, A.J.; Harsha, S.; Beigang, R.; Grischkowsky, D.


Applied Physics Letters 98 (2011), Nr.7, Art. 071108, 3 S.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IPM ()
Terahertz radiation; microwave photonics; optical couplers; optical waveguide

We report the coupling and guiding of broadband terahertz radiation using a two-cylinder waveguide coupler. For the transverse electromagnetic TEM (TM0) geometry, the two opposing metal cylinders exhibit an amplitude transmission comparable to that of the cylindrical silicon lens coupled parallel-plate waveguide, but in the transverse-electric orientation the two-cylinder coupler shows much better amplitude transmission.