Electrodynamic properties of single-crystal and thin-film strontium titanate |
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Authors: | A T Findikoglu Q X Jia D W Reagor C Kwon K O Rasmussen |
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Affiliation: | Los Alamos National Laboratory , Los Alamos , New Mexico , 87545 , USA |
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Abstract: | Abstract We present a comparative study of broadband electrodynamic properties of coplanar waveguides made from nonlinear dielectric single-crystal and thin-film SrTiO3 (STO) with high-temperature superconducting thin-film YBa2Cu3O7-δ electrodes. The waveguides that use single-crystal STO exhibit a monotonic increase in refractive index, dielectric nonlinearity, and dissipation with decreasing temperature (from 80 K to 20 K), whereas those based on thin-film STO show similar but weaker effects with increasing temperature. Under dc bias, both types of waveguides show reduced refractive index, but dissipation increases in the case of single-crystal STO, while it decreases in the case of STO thin-films. |
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Keywords: | nonlinear dielectric strontium titanate high-temperature superconductor loss tangent refractive index large-signal regime |
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