Terahertz radiation emitted by dipole antennas of YBa2Cu3O7-/PrBa2Cu3O 7 multilayers

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The emission amplitude of terahertz radiation pulses emitted by YBa2Cu3O7- thin film antennas increases if thin PrBa2Cu3O7 layers are introduced into the film. Using the same system configuration, sample layout and excitation conditions, the signal efficiency of the electromagnetic pulses, emitted from the device, appears to be dependent on the number of mobile charge carriers inside the superconducting film. Twenty one PrBa2Cu3O7/YBa2Cu3O7 - double layers are deposited to form one multilayer structure. The PrBa2Cu3O7 layers are used to reduce the number of mobile holes in YBa2Cu3O7- without changing the intrinsic properties of the material itself. The thickness of the PrBa2Cu3O7 layers, dPBCO, is varied. dPBCO influences the mobile hole density, i.e. connected to the content x of Pr ions inside the whole multilayer structure: PrxY1-x. The signal amplitude of the emitted terahertz signal increases with increasing dPBCO within the observed thickness range. Calculations of the dependence of the signal efficiency of the emitted terahertz pulses on the transmission of the multilayer structure in the terahertz frequency range agreed well with the experimental results of Y1-xPrxBa2Cu3O7- alloys in the case of a doping x less than 0.3.

Document Type: Miscellaneous

Affiliations: 1: Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Helmholtzweg 5, D-07743 Jena, Germany 2: Research Center for Superconductor Photonics, Osaka University, Osaka 565-0871, Japan

Publication date: January 1, 2002

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