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Design and fabrication of coplanar YBCO structures on lithium niobate substrates
Rozan, Edouard; Collado Gómez, Juan Carlos; García, A.; O'Callaghan Castellà, Juan Manuel; Pous Andrés, Rafael; Fàbrega i Soler, Lluís; Rius Casals, Juan Manuel; Rubí, R.; Fontcuberta, Josep; Harackiewicz, F.
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones
YBa2Cu3O7-δ (YBCO) with low RF losses has been successfully deposited onto lithium niobate (LNO) to improve the performance of electrooptic Mach-Zender modulators. Epitaxial, c-axis oriented superconducting YBCO thin films have been grown on X-cut LNO single crystals with a yttria-stabilized zirconia (YSZ) buffer layer by RF magnetron sputtering. This buffer layer is needed to obtain good superconducting properties of the YBCO grown. Numerical tools have been developed to analyze CPW structures based on YBCO/YSZ/LNO trilayers, and they indicate that YSZ thickness has to be kept to the minimum necessary for good YBCO growth. With this restriction, the RF losses of YBCO/YSZ/LNO samples have been measured. The results from these measurements are used to quantify the performance enhancement in a Mach-Zender modulator using YBCO electrodes.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques
Superconductive devices
Lithium niobate
barium compounds
coplanar waveguides
electro-optical modulation
high-temperature superconductors
lithium compounds
sputtered coatings
superconducting epitaxial layers
superconducting microwave devices
yttrium compounds
RF loss
RF magnetron sputtering
YBCO/YSZ/LNO trilayer
YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// coplanar waveguide
YBa/sub 2/Cu/sub 3/O/sub 7/-ZrO/sub 2/Y/sub 2/O/sub 3/-LiNbO/sub 3/
electro-optic Mach-Zehnder modulator
lithium niobate substrate
superconducting epitaxial thin film
yttria stabilized zirconia buffer layer
Circuits de microones
Superconductors a altes temperatures

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