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Moth-eye structures for reduction of Fresnel losses at THz components

: Brückner, C.; Pradarutti, B.; Riehemann, S.; Stenzel, O.; Steinkopf, R.; Gebhardt, A.; Notni, G.; Tünnermann, A.


Jäger, D. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Millimeter-Wave and Terahertz Photonics : Strasbourg, France, 5 April 2006
Bellingham/Wash.: SPIE, 2006 (SPIE Proceedings Series 6194)
ISBN: 0-8194-6250-0
Paper 61940N
Conference "Millimeter-Wave and Terahertz Photonics" <2006, Strasbourg>
Fraunhofer IOF ()
Fresnel losses; moth-eye structure; THz components; ultra-precision machining

The applicability of moth-eye structures to THz components is investigated. With the help of RCWA and effective medium theory, optimal structural parameters for one-dimensional and two-dimensional periodical surface-relief gratings are deduced. The required structural parameters are in such order of magnitude that they can be manufactured by ultra-precision machining directly into the surface of the substrate material. Benefiting is that plastic materials, which are preferred materials in THz spectral region, can be accurately manufactured by ultra-precision machining. The application of the moth-eye structures follows directly the primary shaping of the components by conventional manufacturing methods like turning and milling so that no additional materials are necessary. A comparison between several structures fabricated on planar plastic probes is given.