"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 12, 2016

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Local excitation of dipole resonance mode in microstrip closed ring resonator of subterahertz frequencies


A. Snezhko 1,2, O. Volkov 1, V. Gubankov 1, I. Gundareva 1,3, Yu. Divin 1,3, V. Pavlovskiy 1, V. Pokalyakin 1

1 Kotelnikov Institute of Radio-engineering and Electronics of RAS

2 Moscow Institute of Physics and Technology

3 Peter Grünberg Institute, PGI-5, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany


The paper is received on December 4, 2016


Abstract. Here the results of subterahertz frequency closed ring resonator study are presented. Microstrip ring resonator was formed from cooper 400 mm film of 400 mm thickness on sapphire substrate by ultraviolet lithography and wet etching and covered by thin PMMA layer. It has a form of square with 111 mm external side length and 95 mm internal side length. Substrate with the resonator was attached to planar bicrystal Josephson junction from YBa2Cu3O7-x high temperature superconductor on NdGaO3 substrate. Resonator was excited by the electric field of Josephson junction in 200-650 GHz frequency range. A dependence of Josephson junction differential resistance on frequency has a peculiarity, related to resonance mode excitation. It is known that in ac Josephson effect dc voltage bias is proportional to the Josephson oscillation frequency. In our case peculiarity voltage corresponded to central resonance frequency of 321 GHz. To analyze resonance mode observed, 3D electromagnetic simulation was performed. A passive electrodynamic system was considered, which consisted of Josephson junction electrodes and a resonator. Real part of the electrodynamic system admittance vs. frequency dependence and current density distribution at the resonance frequency were calculated, It was shown that the resonance observed corresponded to excitation of an even dipole mode. Excitation of this mode was related to electrodynamic system symmetry. This result agreed with earlier experiments on electromagnetic radiation interaction with arrays of microstrip ring resonators.

Key words: superconductivity, Josephson junction, terahertz electronics.


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