Microwave devices based on superconducting surface electromagnetic wave resonator (Review article)

Abstract

In this paper we present an overview of the microwave properties of a surface electromagnetic wave resonator (SEWR) made on the basis of a superconducting film, and also consider possible applications of such resonators to create various microwave devices. Features of such a SEWR are the simplicity of its design (such a resonator, in fact, can be just the superconducting film itself on a dielectric substrate); a large amplitude of microwave electromagnetic field on the surface of the resonator’s superconducting film, which allows one to organize intense interaction of this field with the superconductor; the possibility of synchronous operation of integrated superconducting elements, embedded in the resonator, under the action of its microwave field. The review is based on our works published since 2000 and discusses the possible applications of superconducting SEWRs to create a new class of microwave filters, microwave signal generators and detectors, and other devices based on Josephson junctions.

Microwave Magnon-Plasmon-Polaritons in the Ferromagnetic Metal–Screened Insulator Structure

“…Provided the conditions → ∞ and = 1, the examined resonance structure is the plate of a real metal with finite lateral dimensions × and is located in the free space. This structure is the simplest case of the SEMWR on the basis of a conducting plate (film) with a finite thickness [6,8,9,12,13]. But if < ∞ and ≥ 1, the RFM-NMI-IM resonance structure can be identified with an SEMWR (layer of a real metal on a dielectric substrate) arranged on the wall surface in a rectangular waveguide (the ideal metal screen).…”

“…Note that just such SEMWRs on the basis of a conducting film deposited onto a dielectric substrate are used in practice. For the efficient excitation of oscillations in the SEMWR, the latter is mounted inside a rectangular waveguide [6][7][8][9][10][11][12][13].…”

“…A complete theoretical analysis of the microwave properties of the SEMWR is rather complicated [6][7][8]12,13]. Therefore, let us only consider the simplified model introduced in Section 3.…”

“…For this purpose, let us make the following substitutions in expressions (2): the substitution e −i → sin( ) in the components and and the substitution e −i → cos( ) in the component , assuming ≈ / . In addition, we should take into account that the distribution of the electromagnetic field in the RM-SI resonance structure does not depend on the coordinate (as is indicated by the index = 0 for the fundamental SEMWR mode E 01 ; note that this mode was experimentally determined to be quasi-uniform in the SEMWRs [6,8,9,13]). Taking the aforesaid into account, we obtain the following expressions for the electromagnetic field components at the fundamental mode of oscillations in the SEMWR, E 01 :…”

“…is the relative dielectric permittivity of the medium: = ( ) for the real metal, = for the insulator, and → −∞ √ −1 for the ideal metal quency interval [6,7]. This system turned out convenient for developing various superconducting devices with Josephson junctions [8][9][10][11] (see also recent reviews [12,13]). The theoretical prediction of surface plasmons [14], the quasiparticles that describe collective oscillations of the electron density near the conducting-medium boundary, became a powerful impetus for intensifying the SEMW studies.…”