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This paper reports a mechanically tunable terahertz metamaterial based on microscale electrostatic actuators. The device consists of an array of suspended cantilevers, forming LC resonators with underlying capacitive pads. The applied voltage can pull the cantilever downwards to increase the capacitance value in the resonator, and thus, redshift the resonant frequency. In our preliminary experiments,...
The terahertz filters with multi-layered metamaterials are proposed and fabricated with the negative photoresist as isolation layer. The influence of the relative positions between the different layers to the electromagnetic resonance is discussed by experiment, which reveals that filter frequency is strongly related to the coupling between the different layers. The reason of the influence is theoretically...
We present recent work utilizing terahertz field enhancement in metamaterial structures to drive carrier generation in semiconductors. We implement this as a novel platform to detect terahertz radiation.
In this paper, we present our recent progress on three-dimensional (3D) metamaterials at terahertz (THz) frequencies. Using a “bottom-up” multilayer electroplating technique, a flexible and a broadband tunable metamaterial was fabricated and characterized. In agreement well with numerical simulations, characterization on these 3D metamaterials by THz time domain spectroscopy (THz-TDS) indicates excellent...
In this paper, we present novel optically tunable 3D metamaterials operating at terahertz (THz) frequencies which exhibit a tuning range of approximate 50% of the resonance frequencies. The 3D array structures, consisting of double splits ring resonators (DSRRs) with silicon pads on sapphire, were fabricated using multilayer electroplating technology (MET). As a function of incident laser power, a...
We present frequency tunable metamaterials at terahertz frequencies using broadside-coupled split ring resonators. Frequency tuning, arising from changes in near field coupling, is obtained by in-plane displacement between the SRR layers. A maximum frequency shift occurs for displacement of half a unit cell resulting in a shift of 663 GHz (51% of f0).
We present a metamaterial based terahertz (THz) detector. The detector design, which combines metamaterials and MEMs, is frequency selective, and we have fabricated and tested detectors at 95 GHz and 693 GHz with noise equivalent powers of 1.13 × 10−8 W/√Hz and 2.96 × 10−8 W/√Hz and responsivities of 16,500 V/W and 6,800 V/W, respectively. These values were achieved at room temperature and pressure.
In this paper, a novel ultra-wide band (UWB) bandpass filter(BPF) based on combined technology has been detailed researched. The proposed filter is constructed by composite right/left handed transmission line (CRLH TL) and Sierpinski carpet shaped six-staged stepped impedance lines for the first time. CRLH TL are mainly consists of Koch loop shaped defected ground structure (KDGS) etched in the ground...
In this paper we present a copper-based 3-dimensional (3D) stand-up metamaterial which displays a purely magnetic resonance at terahertz (THz) frequencies. A multilayer-electroplating technique is used to fabricate these arrayed structures and experimental results demonstrate a strong LC resonance at 1.38 THz with quality factor of 18.7. The successful design, fabrication and characterization of these...
We compare a single layer metamaterial quarter-wave plate with a meanderline polarizer. They achieve 99.9% and 99.6% circular polarization at 639 GHz, respectively. These results highlight the large degree of birefringence exhibited by metamaterial structures.
In this work, we present flexible metamaterials on free standing polyimide substrates operating at terahertz (THz) frequencies range. The successful demonstration of THz flexible metamaterials provides a path forward for creating multi-layer non-planar metamaterials such as THz invisible cloak. We also present a design for a metamaterial cylindrical shell capable of acting as an invisible cloak at...
Metamaterials are engineered materials which offer superb electromagnetic performance over naturally occurring materials, and offer great potential to construct novel devices operating in the terahertz frequency regime. Here we experimentally demonstrate metamaterial narrow band filters, perfect absorbing elements for THz imaging, and ultra-fast THz switches. Experiments are supplanted with simulation...
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