Materials Literature
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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…
The design of conformal arrays radiating the same field of reference linear arrangements is addressed within the Material-by-Design (MbD) framework by exploiting a two-step Quasi-Conformal Transformation Optics (QCTO) procedure. Unlike state-of-the-art design methods, the proposed approach allows to enforce that both…
A radial-axial hybrid GRIN theory is developed in order to explore the solution space of an achromatic GRIN singlet. With the achromatic hybrid GRIN theory in hand, the tradeoffs between thickness, curvature, and GRIN type can be directly studied in the context of SWaP (size, weight, and power) reduction. Finally, the…
A mode-mixing cavity, consisting of an electrically-large rectangular cavity with one deformed corner, supports distinct modes as a function of driving frequency. Perforating one side of this cavity, the modes formed within can be projected into an imaging domain, multiplexing the scene's spatial content into backscat…
Conventional passive metamaterials always suffer from the limitation of loss and dispersion due to fundamental causality issue. Especially it becomes severe due to material loss at terahertz frequency. Our work resolves the loss problem by introducing gain device into the metamaterial structure. A passive volumetric m…
In this paper, we present a broadband extraordinary transmission through a one-dimensional grating at terahertz frequencies. The grating with a tapered slit is carved periodically on a high-index GaAs substrate. The material for the grating is undoped Indium Antimonide. The geometry of the tapered slit is optimized to…