Metal-Dielectric Structures for Metamaterial Applications in IR and THz Ranges
Professor Andrei Lavrinenko
DTU Fotonik, Kgs. Lyngby, TechnicalUniversity of Denmark
3:30 pm Monday, 28 February 2011, EN101 Lecture Theatre (EN Building), Hawthorn.
This talk will summarize our activity on 2D and 3D metamaterials targeting both IR and THz ranges. We designed 3D metamaterials with effective parameters (EP) which do not depend on the number of layers. To characterize metamaterial properties in a robust way we proposed and elaborated a simple effective-wave-propagation method for the EP retrieval, demonstrating it in numerous examples. We discuss problems of EP retrieval in the cases of strong coupling between unit cells and for metamaterials with cubic unit cells for isotropic response.
Optical 3D samples (silverized woodpiles) are fabricated by two-photon polymerization and electroless silver deposition. Woodpiles are characterized in IR transmission-reflection measurements. Transmission enhancement at the edges of woodpiles has been observed. 2D THz metamaterials are fabricated in successive application of photolithography and electrochemical growth. Characterization has revealed their remarkable features as almost omnidirectional polarization filters.
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