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Calabazas Creek Research, Inc. and the University of Maryland are developing high quantum efficiency (QE) reservoir cathodes for accelerators, free-electron lasers, ultra-fast electron microscopes and other applications. High QE materials are deposited on an emitter sealing a reservoir of cesium chromate. An integral heater provides a continuous flow of cesium to replace that lost by evaporation,...
We have proposed using nano-antennas to improve the response performance of infrared detectors. Prototypes of mid-infrared superconducting hot electron bolometer formed by a twin-slot-antenna with an NbN strip were fabricated. By the irradiation of mid-infrared (λ=4.89 μm) pulsed light, clear polarization dependency of responses was observed. When the HEB was biased close to the critical current,...
We describe the microstructuring of a silicon surface to act as a spatially tunable dielectric layer. As an example, we show FDTD simulations and fabrication results of it used as an antireflective layer optimized for the terahertz region.
The Horizon 2020 TWEETHER project is proposing for the first time a millimeter wave traveling wave tube (TWT) as enabling device for a new generation of high data rate wireless networks for point to multipoint. The W-band is an unused portion of the spectrum comprised in the range 92–95 GHz that offers multigigabit data rate. The distribution of the signal over a wide area and the strong atmospheric...
Over the past ten years, several silicon microfabrication techniques have emerged to fabricate components for THz instruments. Our approach focuses on the use of multiple silicon dioxide (SiO2) masks and consecutive silicon etching steps using deep reactive ion etching (DRIE) to create multi-step devices with very fine features. We are reporting here on the fabrication of hydrid couplers and a turnstile...
We demonstrate a simple and cost-effective method for fabricating silver-nanoparticle metamaterial structures on a flexible substrate based on inkjet printing. Specifically, we used inkjet printing with an ordinary printer to obtain an array of split-ring resonators (SRRs) on a sheet of paper. We designed the SRR array to exhibit a resonance in the THz region, which we observed through THz time-domain...
We present the first experimental realization of a terahertz (THz) waveguide that exhibits a negative effective index of refraction. To demonstrate this, we designed fabricated and characterized a linear array of three-dimensional structures that consist of split ring resonators and posts. THz radiation is launched and guided in the form of surface plasmon polaritons (SPPs) along the 3D metallic structures...
We report on a carbon nanotubes (CNTs) terahertz (THz) detector based on photothermoelectric effect. We achieved room temperature THz detection, and found that photothermoelectric effect of CNTs, as a THz detected signal, strongly depended on electrode metals, revealing a detailed mechanism of THz responses occurring at the interface between CNTs and electrodes. This result provides a strong possibility...
A kind of single-mode graphene loaded double ridge plasmon waveguide (GDRW) is proposed here, it demonstrates excellent mode confinement and long propagation length. Tunable propagation properties can be realized by changing either Fermi energy level or geometrical parameters, the structure of GDRW can efficiently suppress interference between adjacent devices. So, it can qualify the integration application...
An international consortium including the University of California, Davis (UC Davis), Beijing Vacuum Electronics Research Institute (BVERI), and Lancaster University is involved in the design and fabrication of 0.346 THz BWOs to replace the bulky FIR laser at the plasma diagnostic at the NSTX-U fusion device. The use of a highly energetic beam in a wide channel double corrugated waveguide has been...
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