Bogdan Alexandru Sava, Ion Sandu, Bogdan Stefanita Calin, Lucica Boroica, Ana Violeta Filip, Marius Cătălin Dincă, Alexandra Maria Isabel Trefilov, Claudiu Teodor Fleacă, Marius Dumitru, Marian Zamfirescu, Dumitru Ulieru
The optical effects were obtained by three different ways, which are opal structures, laser polymerizing and plasmonic ultrathin Ag films deposition. Opal structures were realized by deposition of a thin layer composed of sub-micron spheres of polystyrene on the surface of an optical fiber using drop-drying method and capillary method. Multiple diffraction gratings have been designed and obtained on mechanically processed optical fiber, through means of Two-Photon Polymerization via laser direct writing (3D Lithography - 3DL). Ultrathin Ag films of 1 to 9 nm thickness were deposited by RF Magnetron Sputtering onto different substrates.
Metamaterials and photonic crystals are presented as the main approaches to achieve artificial negative refractive materials. Alone or associated with lithography techniques, femtosecond laser constitutes a potential tool for manufacturing negative refractive materials in the range from GHz to optical frequencies. Multi-photon photopolymerization of transparent materials and micro/nano-machining of metallic thin films are promising methods to obtain negative refractive photonic crystals and, respectively, metamaterials. Preliminary experiments of thin-film micro-machining using a femtosecond oscillator-amplifier laser are described. Further methods to improve the femtosecond laser machining are proposed.
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