Wire-grid polarizers for terahertz region were fabricated by manufacturing triangular grating using a ruling-based, ultraprecision diamond machining process and replicating the pattern into polymethylpentene (TPX) and cyklo-olefin copolymer (COC) sheets using hot embossing. On top of the imprinted structures, aluminum was evaporated in an oblique angle, forming an aluminum wire grid. The achieved extinction rate was over 150 for TPX polarizers and near 1000 for COC polarizers.
In this work luminescent optical epoxy samples with micropatterning were fabricated. Five different photoluminescent materials were used as substance in the curing of epoxy resin to form luminescent epoxies of different colors. The absorbance spectra of the unpatterned epoxy samples were measured with spectrometer and the luminescence intensities of all fabricated luminescent epoxy samples were measured using custom made bispectrometer. The micropatterns were copied adequately in the epoxy surface, which would also suggest that nanopatterning would also be possible. Furthermore, the ability to pattern the surface allows fabrication of for example anti-reflective, hydrophobic and selfcleaning structures. Further investigation in different luminescent materials suitable for solar concentrator applications is required in order to develop current systems.
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