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We report fabrication method and THz characterization of composite filmscontaining either aligned metallic (tin alloy) microwires or chalcogenideAs2Se3 microwires. The microwire arrays are made by stack-and-draw fiberfabrication technique using multi-step co-drawing of low-melting-temperaturemetals or semiconductor glasses together with polymers. Fibers are then stackedtogether and pressed into composite films. Transmission through metamaterialfilms is studied in the whole THz range (0.1-20 THz) using a combination ofFTIR and TDS. Metal containing metamaterials are found to have strongpolarizing properties, while semiconductor containing materials arepolarization independent and could have a designable high refractive index.Using the transfer matrix theory, we show how to retrieve the complexpolarization dependent refractive index of the composite films. We then detailthe selfconsistent algorithm for retrieving the optical properties of the metalalloy used in the fabrication of the metamaterial layers by using an effectivemedium approximation. Finally, we study challenges in fabrication ofmetamaterials with sub-micrometer metallic wires by repeated stack-and-drawprocess by comparing samples made using 2, 3 and 4 consecutive drawings. Whenusing metallic alloys we observe phase separation effects and nano-gridsformation on small metallic wires.

Composite THz materials using aligned metallic and semiconductor microwires, experiments and interpretation