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In this paper two metamaterial structures are presented for the design of millimeter and terahertz (THz) bolometers. The first design is composed of U-shaped resonant structures grouped together to achieve strong absorption and wide-bandwidth properties. The second design is a hybrid between a serpentine and a spiral structure which provides strong absorption over a much wider bandwidth (> 100...
This paper introduces a UWB high gain Vivaldi antenna fabricated with a polymer-based 3D printer. 3D printing technology allows for simple fabrication that is easier, faster, and lower cost compared to traditional microfabrication and metal fabrication techniques. Two 3D printed designs are presented, the first of which is a simple Vivaldi notch antenna with a radiating slotline cavity. The second...
In this paper, the design of THz thin-film components using single and multi-objective evolutionary algorithms is introduced. Each structure is optimized through a HFSS-MATLAB interface with infinitely periodic boundary conditions and plane wave incidence. First, terahertz band-stop filters are investigated based on a dual-cross structure. The filters are optimized for rejection, bandwidth, and multi-resonant...
A novel metamaterial inspired resonating structure coupled with a microfluidic channel has been evaluated for sensing applications in the microwave frequency range. The structure is based on an open split ring resonator (OSRR) design, was simulated in a finite element analysis tool (Ansys HFSS®) and tested using a Vector Network Analyzer to detect changes in resonant frequency, amplitude, and phase...
This paper presents the design, fabrication and characterization of a terahertz (THz) spoof surface plasmon based near field probe. It is built using a single side metalized bulls-eye plastic structure with a micro-lens at the aperture. 3-D printing is used in the fabrication of the plastic structure followed by a thin film metal coating. Details analysis is carried out using FEM simulation tool....
In this paper, lossy metasurfaces are employed in the design of uncooled terahertz (THz) bolometers on polymer substrate. The metasurface bolometer is composed of a metal backed low loss dielectric substrate and thin patterned lossy metal layer. Numerical simulations using finite element method (FEM) are carried out to design optimal unit cells with high absorptivity. An array of these unit cells...
This paper presents a plastic, surface plasmon (SP) enhanced bullseye antenna for millimeter wave and terahertz (THz) frequency range. A low refractive index plastic layer is used to confine incident electromagnetic energy to the structure. A metal grating layer focuses the incident wave through a subwavelength aperture via SP. The electromagnetic propagation characteristics were simulated and analyzed...
Carbon fibers are utilized in the fabrication of terahertz (THz) polarizers on polymer substrates. Commercially available fibers are aligned on a polymer substrate through a dip coating process. During the dip coating process, the fibers align in parallel to each other on the substrate. A multilayer structure is achieved using this approach. This fine alignment and multi-level stacking leads to THz...
This paper demonstrates fabrication and characterization of reduced graphene oxide (RGO) based Schottky diodes on a flexible substrate. Current-voltage measurements on the fabricated devices show strong non-linearity. Diodes are tested for high frequency applications such as detection, frequency multiplication and mixing over a frequency range of 1–18 GHz. The devices show third order frequency multiplication...
Design and fabrication of dielectric lenses for terahertz (THz) focal plane arrays are presented in this paper. Lenses are designed using optical lens and ellipsoid function theory in the terahertz range (centered at f = 300GHz). In order to enhance coupling to planar circuits on wafer, two types of lenses are considered: modified hemispherical, such as extended hemispherical and hypo-hemispherical...
This paper presents a high-quality factor (Q) X-band oscillator that utilizes a planar metamaterial-inspired modified split ring resonator (mSRR) in its design. The mSRR of this paper has a quality factor above 300 at 7.89GHz. Design of an X-band oscillator circuit is presented in this paper. In comparison to dielectric resonators, metamaterial resonators can prove to be reliable under harsh conditions,...
This paper presents a new compact bandstop filter designed using a novel periodic structure. The proposed periodic resonant structure is based upon a split ring resonator (SRR) design, and it shows the characteristics of a bandstop LC resonator. The designed bandstop filter has the desired characteristics such as wide bandwidth, sharp and deep skirt performance and small physical size. Details of...
A modified split ring resonator (mSRR) is incorporated into a compact folded dipole antenna structure to lower the resonant frequency of the circuit. The resonance characteristics of the antenna are further improved by incorporating a solid ground plane. By integrating a varactor diode as an integral part of the antenna, the resonance characteristics of the antenna can be electronically tuned. A tuning...
In this paper, a broad band reconfigurable phase shifter designs utilizing composite right/left-handed transmission line (CRLH TL) metamaterials is demonstrated for X-band applications. Metamaterial unit cells are designed that allows seamless integration of active devices (varactor diodes) in order to achieve reconfigurability. Design equations and properties with arbitrary phase, band-pass characteristic,...
In this paper, two microstrip transmission line based metamaterial structures (sub-wavelength sized resonators) are designed and implemented in near field sensing of dielectric materials. One structure is designed for band-stop and the other for band-pass performance in the X-band region. These resonators load the microstrip lines on both the sides. Resonator on one side is used in interrogation of...
In this paper, a spoof surface plasmon assisted antenna is paired with a metamaterial enhanced bolometer structure in the formation of a THz focal plane array pixel. The antenna element focuses the electromagnetic wave onto the bolometer element and the bolometer detects this incident power through resistance change. Numerical analysis was performed in order to simulate the plasmonic structure at...
This paper presents planar metal patterned structures that support surface plasmon polaritons (SPPs) like propagation mode. Four unit cells, each having a solid ground plane, were designed that support SPPs. To optimize return loss, these structures were first simulated as infinitely periodic in two dimensions. These were then further optimized by designing waveguide structures. Using multi-band unit...
In this paper, THz circuits and sensors are designed and experimentally implemented using a cost effective plastic injection micromolding process. Plastic resin, having low refractive index and loss in THz region, was used as the base material to manufacture THz circuits. Periodic structures such as photonic bandgap (PBG) were utilized to design THz circuits and sensors. Numerical simulations were...
A novel power meter operating from 0.1 to 0.2 THz is presented. The power meter has utilized a thin-film metamaterial inspired absorbing layer. This absorber has the desired characteristics such as ultra-wide bandwidth and strong absorption. In a bolometer-like measurement setup, it functions as a wideband high-responsivity THz detector. The absorbing layer consists of a low loss thin dielectric membrane...
In this paper, plastic microinjection molded WR-3 rectangular metalized waveguides are demonstrated. The process is simple to implement and allows fabrication of complex 3D structures. Different types of waveguide filters are fabricated using this process and measured results are reported. Simulation results show that filters with good performance in the millimeter and sub-millimeter wave range can...
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