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Enhanced coupling of terahertz radiation to cylindrical wire waveguides

Enhanced coupling of terahertz radiation to cylindrical wire waveguides

Optics Express 14(1): 279-290

Wire waveguides have recently been shown to be valuable for transporting pulsed terahertz radiation. This technique relies on the use of a scattering mechanism for input coupling. A radially polarized surface wave is excited when a linearly polarized terahertz pulse is focused on the gap between the wire waveguide and another metal structure. We calculate the input coupling efficiency using a simulation based on the Finite Element Method (FEM). Additional FEM results indicate that enhanced coupling efficiency can be achieved through the use of a radially symmetric photoconductive antenna. Experimental results confirm that such an antenna can generate terahertz radiation which couples to the radial waveguide mode with greatly improved efficiency.

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Accession: 052982954

Download citation: RISBibTeXText

PMID: 19503341

DOI: 10.1364/OPEX.14.000279

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