11 November 2014 Tailoring fabrication parameters of silver helical metamaterials for enhanced polarization properties in terahertz regime
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Abstract
Metallic helices have been extensively researched and demonstrated for their application as broadband circular polarizers in different frequency regimes. For making such 3D helices, two photon lithography (TPL) has been employed in conjunction with electroplating of metals. Recently, our group has demonstrated selective silver electroless plating of two photon fabricated polymer (SU-8) structures on silicon substrate. This procedure allows us to make metal-coated polymer helices. In this work, we examine how these fabrication process parameters could be tailored to obtain higher extinction ratios for circular polarizers in THz regime (or MIR regime). We further analyze the role of aspect-ratio of helices in their polarizing action. We will present both simulation and experimental results to show the improved performance of the polarizers.
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Shuvan Prashant Turaga, Kwan Bum Choi, Yuanjun Yan, Andrew A. Bettiol, "Tailoring fabrication parameters of silver helical metamaterials for enhanced polarization properties in terahertz regime", Proc. SPIE 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III, 927507 (11 November 2014); doi: 10.1117/12.2070846; https://doi.org/10.1117/12.2070846
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