Highly tunable SrTiO3/DyScO3 heterostructures for applications in the terahertz range

Several types of multilayer structures based on SrTiO3 and DyScO3 thin films were prepared by laser ablation. The dielectric properties of these samples without and under applied static or low-frequency electric field at room temperature were determined in the terahertz spectral range by time-domain terahertz spectroscopy. We demonstrate up to 65% variation of the permittivity of SrTiO3 films and up to 33% modulation of the power transmission of terahertz waves at 500 GHz and 100 V (67 kV/cm) bias. (c) 2007 American Institute of Physics.