Nanocomposite superconductors for low loss filter design

The phenomenon of surface plasmon resonance is often used in various devices of photonics and optoelectronics, for which the speed of response and the ability to control the parameters of devices are important. The use of high- temperature superconductors as plasmonic structures has a number of features, the most important of which is low damping. In this paper, we consider the characteristic of surface plasmon resonance in nanocomposite structures consisting of a dielectric matrix with superconducting inclusions. The temperature dependence of the dielectric constant of the superconductor is calculated taking into account the two-fluid model. It is shown that the surface plasmon frequency highly depends on the temperature, which makes it possible for the practical application of nanocomposite superconductors in the design of bandpass notch filters.