title: Terahertz plastic compound lenses.
abstract: We present terahertz (THz) lenses made of highly refracting polymeric compounds which provide a better focusing performance and an increased functionality in comparison to conventional THz lenses. Using mixtures consisting of polypropylene (PP) and alumina as well as PP and zinc sulfide allows a significant increase of the refractive index while simultaneously keeping a low extinction and dispersion. With these new material combinations, lenses with an increased focusing capability are realized. This is evaluated by focal plane measurements using a fiber coupled THz time-domain spectrometer.
authors.affiliation: Department of Physics and Materials Sciences Center, Philipps-Universität Marburg, Marburg, Germany. matthias.wichmann@physik.uni-marburg.de
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authors.lastname: Wichmann
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authors.lastname: Kocic
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authors.lastname: Lippert
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authors.lastname: Schwerdtfeger
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authors.lastname: Schumann
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authors.lastname: Heidemeyer
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authors.lastname: Bastian
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authors.lastname: Bastian
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authors.lastname: Koch