The growing and rapid interest in new artificial metamaterials, whose properties differ from the normal materials has motivated further investigations. The metamaterials have simultaneously negative permittivity and permeability. In this work, we have demonstrated theoretically the existence and behavior of the TE guided waves in a ferromagnetic/metamaterial/antiferromagnetic waveguide structure. The dispersion characteristics are performed for different kinds of metamaterials. The existence and the type of the solutions to the guided waves with respect to different physical parameters are also investigated and discussed. It has been shown that the metamaterials can lead to different, new unusual properties.
This paper investigates the effect of Au nanoparticles on the performance of 3C-SiC thin film-based ultraviolet photodetector (SiCTF-UVPD) fabricated on Si through a very practical and cost-effective process scheme. The main parameters such as the speed, sensitivity, stability, repeatability, and reliability have been systematically studied. It was observed that the Au nanoparticles substantially improved the photodetector performance with a very high sensitivity of 6.2×10 4 and fast response with rise and decay times of 0.36 s and 0.67 s, respectively at a bias voltage of 20 V. The significant increase in photocurrent from the Au nanoparticles is likely due to localized surface plasmons leading to strong absorption around the Au nanoparticles. The low-cost fabrication, high stability, high sensitivity, and very fast response of the device open good opportunities towards the development of good performance SiC thin film-based photodetectors for optoelectronic applications.
The paper is concerned with the propagation characteristics of TE surface waves in a planar wave-guide structure of a lateral antiferromagnetic-non magnetic super lattices (LANS) film bounded by a nonlinear dielectric cover and a left-handed substrate (LHM). In LHM substrate both permittivity and magnetic permeability are negative in definite frequency range. We study nonlinear dispersion properties of the TE surface waves and illustrate the power flow variation with the wave index in three different cases, i.e., when both permittivity and magnetic permeability are negative, when permittivity is negative and permeability is positive, and when both permittivity and magnetic permeability are positive. In the first case, we found that surface waves are backward traveling and the wave power variation with the wave index shows bistability behavior. We also found that by increasing the film thickness the waves turn from forward to backward traveling in the second case. In the third case, surface waves are always forward traveling.
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