. "Terahertz radiation; tunable structures; photonic crystals; metamaterials; modulators; soft mode"@en . . "2011-03-18+01:00"^^ . " tunable structures" . . "14"^^ . " modulators" . "Terahertz radiation" . "14"^^ . "http://www.isvav.cz/projectDetail.do?rowId=IAA100100907"^^ . . "2013-06-28+02:00"^^ . "In last years, the terahertz spectral range has witnessed a rapid progress in terms of sources, detectors and a quest for new applications. The project aims to conduct research into materials and experimental configurations with optical properties in the THz region commandable by external parameters. Applying a bias appears to be the most promising approach; then, the resulting components act as modulators usable e.g.for data transfer. Within the project we will investigate theoretically and experimentally the properties of thin film ferroelectrics and metamaterials based on doped silicon. One of the means for achieving a high tunability is to use resonant configurations of 1D photonic crystal-like structures with a defect of periodicity. Thus, one can enhance the electrical field within the defect material and increase the nonlinear response of the whole structure. The research will aim at a substantial improvement in achievable parameters of resulting tunable structures."@en . "Ve spektr\u00E1ln\u00ED oblasti elektromagnetick\u00FDch vln ozna\u010Dovan\u00FDch jako terahertzov\u00E9 z\u00E1\u0159en\u00ED v posledn\u00EDch letech nastal dynamick\u00FD v\u00FDvoj zdroj\u016F, detektor\u016F i nov\u00FDch aplikac\u00ED. C\u00EDlem projektu je v\u00FDzkum materi\u00E1l\u016F a takov\u00FDch uspo\u0159\u00E1d\u00E1n\u00ED, kdy optick\u00E9 vlastnosti v THz oblasti lze ovliv\u0148ovat pomoc\u00ED vn\u011Bj\u0161\u00EDch parametr\u016F. Jako jeden z nejvhodn\u011Bj\u0161\u00EDch p\u0159\u00EDstup\u016F se jev\u00ED p\u0159ilo\u017Een\u00ED elektrick\u00E9ho pole; v\u00FDsledn\u00E9 sou\u010D\u00E1stky se tak chovaj\u00ED jako modul\u00E1tory vyu\u017Eiteln\u00E9 nap\u0159. pro p\u0159enos dat. V r\u00E1mci projektu budou experiment\u00E1ln\u011B i teoreticky zkoum\u00E1ny vlastnosti tenk\u00FDch vrstev feroelektrick\u00FDch pevn\u00FDch l\u00E1tek a metamateri\u00E1l\u016F zalo\u017Een\u00FDch na dotovan\u00E9m k\u0159em\u00EDku. Jedn\u00EDm z prost\u0159edk\u016F pro dosa\u017Een\u00ED vysok\u00E9 laditelnosti je pou\u017Eit\u00ED rezonantn\u00EDho uspo\u0159\u00E1d\u00E1n\u00ED struktury typu jednorozm\u011Brn\u00E9ho fotonick\u00E9ho krystalu s poruchou periodicity; t\u00EDm lze dos\u00E1hnout zes\u00EDlen\u00ED elektrick\u00E9ho pole v materi\u00E1lu defektu a zv\u00FD\u0161en\u00ED neline\u00E1rn\u00ED odezvu cel\u00E9 struktury. V\u00FDzkum metamateri\u00E1l\u016F bude zam\u011B\u0159en na v\u00FDznamn\u00E9 zlep\u0161en\u00ED dosa\u017Eiteln\u00FDch parametr\u016F v\u00FDsledn\u00FDch struktur." . . . "2011-12-31+01:00"^^ . . . . . "IAA100100907" . "Aktivn\u011B laditeln\u00E9 struktury a metamateri\u00E1ly pro terahertzovou oblast" . . . . . "Actively tunable structures and metamaterials for the terahertz range"@en . " metamaterials" . "2009-01-01+01:00"^^ . . "0"^^ . . " photonic crystals" . . "Changes of THz properties of ferroelectric materials with temperature and bias were studied. The results were explained by a theory based on lattice dynamics. Geometries of dielectric metamaterials with a negative effective permeability were developed."@en . "3"^^ . . "Byly studov\u00E1ny zm\u011Bny THz vlastnost\u00ED feroelektrick\u00FDch l\u00E1tek s teplotou a elektrick\u00FDm nap\u011Bt\u00EDm. V\u00FDsledky byly objasn\u011Bny pomoc\u00ED teorie na \u00FArovni m\u0159\u00ED\u017Eov\u00E9 dynamiky. D\u00E1le byly vyvinuty geometrie dielektrick\u00FDch metamateri\u00E1l\u016F se z\u00E1pornou efektivn\u00ED permeabilitou."@cs . "1"^^ .