Materials Literature
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We theoretically and experimentally demonstrate that by utilizing a new freedom introduced by spatial dispersions in the effective parameters, Brewster effect can be extended from a single angle to a range of angles, enabling wide-angle impedance matching and total transmission of light through the surface. By designi…
A flat, focusing, metamaterial lens, operating at 60 GHz was designed using 3-layer elements consisting of metallic bars and split ring commutators. Its free space focal length is 15 mm. We also simulated a system where a pair of such lenses is placed on either side of biological tissue consisting of a 2-layer skin-bl…
We present our recent advances in nanoscale lasing action enabled by plasmonic resonances. First, we study lasing action in plasmonic crystals incorporating optically pumped four-level gain media. We show that the excitation of dark plasmonic resonances (via the gain medium) enables accessing the optimal lasing charac…
Simulation of optical properties of fishnet structures consisted of two gold layers have been performed. It is shown that in near-infrared range (optical communication frequencies) such structures possess negative refraction index and optical magnetism. The distinctive feature that define geometry of considered struct…
Complete absorption of light which has been recently demonstrated in metamaterials has drawn the attention of the scientists because of its potential application in harvesting energy and sensors. Controlling the absorption band-width, peak position and intensity are some of the essential factors in metamaterial absorb…
The behavior of optimally-designed electrothermally controlled complex materials, when implemented with different bias network setups, is investigated in this paper. The proposed devices obtained from the combination of two-hot-arm electrothermal actuators with a split-ring resonator (SRR) can be actuated by employing…
The existence of bound states within the continuum has been known since the early years of quantum mechanics. However a realistic quantum system supporting such bound states has not yet been designed. Here we present a core-shell semiconductor heterostructure composed of Hg1-xCdxTe compounds, which is able to support…
Graphene, as a sheet conductor, supports surface plasmon modes, which, due to the zero band gap of its electronic stucture, can be absorbed and re-emitted by the creation or anihilation of electron/hole pairs. This opens up the question, whether plasmons with gain can be supported by partially inverting the carrier sy…
We study optical properties of subwavelength arrays of 3D-chiral metal holes exhibiting extreme circular dichroism and optical activity. The nanoscale shape features resolved by atomic force microscopy were processed with the developed AFM-to-FDTD data pipeline for reconstruction, averaging and preparation of the hole…
Based on transformation electromagnetics concept, the design procedure of a lens antenna, which steers the radiated beam of a primary source, is presented. Laplace's equation is adopted to construct the mapping between the virtual space and the physical space. Full wave simulations are performed to validate the model.…
We propose a new lens design via isotropic refractive index of heterogeneous medium. By aid of conformal map, one transfers the full Maxwell fisheye into a mapped profile within a unit circle. By this trick, the imaging resolution of this new profile is maintained as good as the mirrored Maxwell fisheye profile or its…
Two-port multimode interference reflectors with different reflection coefficients are demonstrated in thick SOI. Measured devices feature reflectivities between 0% and 50% with worst-case peak-to-peak variations of ±12.5% over a 20 nm bandwidth (1540-1560 nm).
We investigate second-harmonic generation from arrays of metal nanoparticles as a function of the incident angle of light into the structure. The generated signal is significantly affected by the surface-lattice resonances of the structure.
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…