Materials Literature
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We present the theoretical and numerical analysis of lasing action in a surface plasmon distributed feedback laser. We find a lasing threshold and other characteristics of the surface plasmon laser. Our calculations demonstrate that for certain parameters the lasing threshold nonmonotonically varies with the losses in…
In this contribution, we investigate the mechanism governing the Ratchet effect in patterned monolayer graphene, at the ballistic nanoscale. Still smaller than currently achievable and manifacturable devices, the simulated structures serve to exemplify the dependence of charge scattering on the arrangement of lattice…
Abstract : Ballistic gelatin samples are measured to find their density and the specific heat capacity as a function of temperature. Their volume thermal expansion coefficients, the specific heat capacity ratio (from tests in the range of 20-30 degree C), and the Grueneisen parameter as a function of temperature are c…
Two graphene-silicon field-effect transistor samples are characterized as a biological sensor of single-stranded DNA at DC and 101 GHz. In the first sample the 13-mer DNA is detected at DC and 101 GHz at three different molarities: 0.01, 1.0 and 100 nM. In the second sample it is so detected at only 1.0 nM but under p…
Recently, there has been a flurry of research in the field of alternative plasmonic materials, but for telecommunication applications, CMOS compatible materials titanium nitride and doped zinc oxides are among the most promising materials currently available. TiN is a gold-like ceramic with a permittivity cross-over n…
In this paper, we demonstrate that a wire medium (WM) slab loaded with graphene-nanopatch metasurfaces (GNMs) enables the enhancement of evanescent waves for the subwavelength imaging at terahertz (THz) frequencies. The excited surface plasmons at the lower and upper GNMs are coupled by an array of metallic wires. The…
The interaction between an object and electromagnetic waves can be described in terms of its surface impedance. By introducing large anisotropy into artificial impedance surfaces, it is possible to achieve a high degree of control over this interaction that is not possible with isotropic surfaces. These surfaces can b…
Simulation and discrimination of several different types of insulation failure has been proposed. In the present paper, five types of insulation failures that are apt to occur in power transformers are simulated using PSIM. Input-output voltage as well as input current of each insulation failure type is monitored and…
In this contribution, we propose a novel approach for the design of scattering cancellation devices operating at optical frequencies and exhibiting enhanced performance compared to the state of the art. The cloaks, consisting of an arrangement of plasmonic nanoparticles, are modeled through a 2D analytical model able…
We explore possible applications of our previously-introduced nonlocal-transformation-optics framework to scenarios of interest for dispersion engineering. In particular, we address the design of nonreciprocal effects (such as unidirectional propagation), as well as exotic effects such as the “frozen-mode” regime and…
In theory, a Super Phase Array (SPA) which radar cross section is greatly enhanced can be constructed. However no such array has been made to date. The reason for this lies in the complexity of building the key component of this SPA - the super lens. Here, we shall demonstrate how this complexity can be greatly reduce…
A simple band-notched coplanar waveguide (BNCPW) is presented in this paper, which is designed based on the idea that a defect mode in the bandgap between the fundamental and higher modes of the spoof surface plasmon polaritons (SSPPs) can be introduced to form a stopband. The BNCPW, a quite simple structure, consists…
We demonstrate a novel method to measure chromatic aberrations of microscope objectives with metallic nano-particles using incoherent white light. Extinction spectra are recorded while scanning a single nano-particle through a lens's focal plane. We show a direct correlation between the focal wavelength and the longit…
This paper reports design of a very low-cost (less than 2000 USD) CVD reactor for graphene synthesis, based on readily available off-the-shelf components. The reactor is intended for in-house graphene synthesis in metamaterial research. The reactor was manufactured and tested, and synthesized graphene samples were fou…
Spectral, angular and spatial characteristics at ultraviolet frequencies are calculated of the flat lenses based on layered Ag/TiO2structures. It is shown that phase function of MD-structure allows one to predict the ability of lens to focus the light and also to calculate its focal distance. The equation of the lens…
Photonic hypercrystals represent a new class of artificial optical composites, that has the properties of both the metamaterials and the photonic crystals, as well as some new features not found in these media. In particular, the hypercrystals support an even number of Dirac dispersion cones that originate from the Mo…
In effective medium approximation the possibility is shown and conditions are obtained for creation of epsilon-near-zero fishnet metamaterials based on the multilayered metal-dielectric nanostructure with implemented dielectric or metallic nanocylinders. It is established the possibility of realization of diffraction-…
A general theory for one-way optical guiding in periodic particle arrays is developed. Conditions on the asymmetry properties of the structure's period that are necessary to obtain asymmetric dispersion are derived. The two-type rotation principle, presented and studied in previous works on one-way guiding in particle…
Quasi-Periodic (QP) particle chains exhibit unique properties not observed in periodic ones. Furthermore, they inherently support significant long-range interactions and radiation to the surrounding medium. Hence they are fundamentally different from traditional QP structures governed by the Harper's model or the almo…
We propose an intracavity plasmon absorption spectroscopy method based on graphene active plasmonics. Maximum sensitivity is reached in the vicinity of the plasmon generation threshold. The giant amplification of sensitivity in the graphene plasmon generator is associated with a huge path length, limited only by the d…