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We present terahertz lenses made of polymeric compounds which provide a better focusing capability and an increased functionality than state of the art lenses made of pure base polymers. This is achieved by employing mixtures between polypropylene and alumina as well as polypropylene and zinc sulfide which allows for a significant increase of the refractive index of the lens base material.
The constant drive to further miniaturization and heterogeneous system integration leads to a need for new packaging technologies which also allow large area processing with potential for low cost applications. Wafer level embedding technologies and embedding of active components into printed circuit boards (Chip-in-Polymer) are two major packaging trends in this area. This paper describes the use...
We investigate various composite systems in the terahertz frequency regime and apply different effective medium theories to model their dielectric response. A broad variety of composites is considered, ranging from polymeric compound mixtures to biological samples. For each case, the effective medium theory of choice is illuminated in detail.
We demonstrated the potential of terahertz spectroscopy for contactless and nondestructive inline control of polymeric compounding processes. Using a fiber-coupled terahertz spectrometer, we investigated molten polymers and polymeric compounds. On one hand, we studied the influence of temperature and pressure on the terahertz properties of molten polypropylene. On the other hand, various polypropylene–CaCO...
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