Materials Literature
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We study the properties of dipolar wave propagation in linear chains of isotropic particles with independent electric and magnetic response, embedded in vacuum. It is shown that transverse-polarization left-handed waves can be supported by the structure even if the chain's particles possess positive polar-izabilities…
A two dimensional magneto-dielectric substrate is designed for miniaturization of a rectangular microstrip patch antenna with circular polarization. A metamaterial structure that used for realizing the two dimensional magneto-dielectric substrate increases the constitutive parameters of the substrate. Furthermore, the…
In this paper a novel Radar Absorbing Material (RAM) structure with enhanced reflecting and absorbing properties in the 2-18 GHz band is presented. Shielding properties are improved with nano-graphene particles deposited on the surface of composite materials. The nanomaterial allows an ad hoc optimization of the elect…
We applied the BroadBand Green's Function with Low wavenumber extraction (BBGFL) to calculate band diagrams of periodic structures with non-circular dielectric scatterers. A low wavenumber component is subtracted out from the periodic Green's function to obtain the broadband periodic Green's function with fast converg…
The scattering properties of a lossless isotropic dielectric sphere as a function of its relative permittivity are studied and presented. The analytically calculated extinction efficiency spectrum reveal several regions of particular interest, such as plasmonic and dielectric resonances. Additional details about the r…
In this contribution, we present a compact polarization rotator consisting of a single chiral particle able to transform a linearly polarized wave in the corresponding cross-polarized wave. Thanks to its electrically thin structure, it can find applications in both radiating and transmitting components at microwave fr…
An interesting metamaterial Non-Crosstalk structure with anisotropic properties has been developed in the Nanoplasmonics and Metamaterials Research Lab at RIT. It is a cubical structure with Multilayer Metal-Insulator (MMI) stack-up, in the center of which are two groves cut orthogonal to each other. The dielectric pr…
We discuss the possibility of rectifying infrared radiation using metal-insulator-metal (MIM) tunneling nanodiodes, which are nano-engineered to nano-rectennas and hyperbolic metamaterials (HMMs). We show that a lithographically patterned HMM may enable efficient, broadband and omnidirectional rectification of mid-inf…
A novel technique for suppression of orthogonal polarization in a microstrip composite right/left-handed leaky-wave antenna has been proposed. The presented technique is based on mirroring of every second unit cell which improves the desired vertical polarization. The proposed simple technique has been experimentally…
The system matrix resulting from a frequency-domain finite-element based analysis of a general electromagnetic problem is indefinite, the condition number of which is also large in general, preventing efficient solutions of the system matrix. Instead of staying with the original indefinite operator to develop fast sol…
In this paper, a procedure to calculate the dyadic impedance (or admittance) Green's function for a grounded layer of LCs is briefly presented. To validate the theoretical procedure, an example of dispersion calculation of a grounded layer of LCs is presented, showing excellent agreement with the simulations made with…
A two-element antenna array with a 1/40-wavelength interval is proposed, and analysed using the method of moments (MoM). Based on the time reversal (TR) technique, the two antenna elements can work simultaneously with little interference when metal-wire resonators are loaded controllably. It shows that the resonators…
This work presents the characterization of a metasurface (MTS) antenna which supports two orthogonal surface waves (SWs) of transverse electric (TE) and transverse magnetic (TM) types that, at the operating frequency, propagate in the structure with the same phase velocity. The introduction of a rotationally symmetric…
We propose a THz spatial filter using frequency selective surfaces (FSS) integrated with bimaterial actuator for switching. The actuator consists of two materials that have different thermal expansion rates and can be designed based on temperature tuning. The goal for this design is to develop high performance reconfi…
In this work, electric field distribution is compared between the dipole and bow-tie Optical Nano Antenna (ONA) structures using the Finite Difference Time Domain (FDTD) simulations. These results are very crucial for sensing applications. It will help us decide how much thickness would be appropriate for covering the…
Gradient-index (GRIN) optics has seen a surge of interest due to the advent of Transformation Optics (TO) which has enabled a new generation of GRIN devices. Moreover, these devices often have better performance than what has been achieved with more traditional GRIN design techniques. In order to better understand the…
In the present paper, we present a testbed appropriate for the evaluation of the bandwidth enhancement of effective permeability of a metamaterial when non-Foster circuits are used. The proposed methodology is used for the evaluation of the bandwidth enhancement of a split ring resonator sample when a negative inducto…
This paper theoretically presents nonreciprocity of propagation characteristics of guided waves in a transversely magnetized ferrite slab with a thick perfect electric conductor (PEC) strip grating. The effect of the metal strip thickness on the nonreciprocity of the propagation characteristics is theoretically and nu…
Here, we propose the design of a nonlinear microwave metasurface with the aim to obtain mantle cloaking devices exhibiting a power-dependent behavior. For this purpose, we load a properly patterned metallic surface with pin diodes and use it as a conformal cloak of a metallic rod. By properly modeling the nonlinear be…
Starting from the numerical solver based on boundary-integral spectral element method, the optical/electro-optic Kerr effects ignored by most previous study in third harmonic optical nano-structure design are effectively analyzed. Under strong localized surface plasmonic resonances, the optical Kerr effect behaves imp…