For 40 years, the FernUniversität in Hagen has been devoted strictly to distance teaching. Ten years ago, an MSc program in Electrical Engineering was started, consisting of different directions of emphasis. One of them is a full 3-4 semester program on Photonics. Here, we report about the concept, the tools, the status and the experiences during recent years with this program.
The material characteristics in the THz-domain are an outstanding issue that challenge the development of suitable waveguides. It was shown that a simple metallic wires can provide waveguding with low attenuation and low dispersion. However, the need of an efficient coupling of free-space radiation limits the capabilities of the metallic wires. Here we suggest a coupling method which promise a significant increase in the coupling efficiency. We use the endfire-method which allows an excitation of the waveguide modes by direct illumination to the wire's front facet. The incident field is shaped in the field distribution by a spiral axicon and the polarization is modified by a sub-wavelength grating.
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