Photoconductive terahertz antenna with radial symmetry - Electronics Letters
نویسنده
چکیده
It has been demonstrated recently that it is possible to guide broadband terahertz pulses utilising a novel coaxial waveguide. This technique is hindered by the difficulty in exciting the radially polarised fundamental mode of the waveguide. To optimise mode matching, a novel radially symmetric photoconductive terahertz antenna is proposed. Using finite element method simulations and analytical calculations, it is shown that this antenna can generate the desired radial polarisation.
منابع مشابه
The excitation and emission of terahertz surface plasmon polaritons on metal wire waveguides
The development of effective techniques for guiding pulsed terahertz radiation is essential for the continued development of terahertz spectroscopy and imaging applications based on the technique of time-domain spectroscopy. Terahertz surface plasmon polaritons (SPPs) can be excited and guided on cylindrical metal wires with low loss and dispersion. This propagating surface wave, known as a Som...
متن کاملExcitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna.
The generation of terahertz (THz) transients in photoconductive emitters has been studied by varying the spatial extent and density of the optically excited photocarriers in asymmetrically excited, biased low-temperature-grown GaAs antenna structures. We find a pronounced dependence of the THz pulse intensity and broadband (>6.0 THz) spectral distribution on the pump excitation density and simu...
متن کاملModeling and Design of Photoconductive and Superconductive Terahertz Photomixer Sources
Terahertz technology is a fast growing field with variety of applications in biology and medicine, medical imaging, material spectroscopy and sensing, monitoring and spectroscopy in pharmaceutical industry, security, and high-data-rate short-range communications. Among different terahertz sources, photomixers are potentially compact, low power consuming, coherent, low-cost, and tunable continuo...
متن کاملComputational modeling of plasmonic thin-film terahertz photoconductive antennas
This work presents a computational approach for investigating terahertz photoconductive antennas with enhanced performance via thin-film plasmonic electrode configurations. The commercially available finite element method solver COMSOL Multiphysics is implemented to solve Maxwell’s wave equations along with the coupled drift-diffusion/Poisson’s equations. The proposed approach is compared with ...
متن کاملHigh Sensitivity Terahertz Detection through Large-Area Plasmonic Nano-Antenna Arrays
Plasmonic photoconductive antennas have great promise for increasing responsivity and detection sensitivity of conventional photoconductive detectors in time-domain terahertz imaging and spectroscopy systems. However, operation bandwidth of previously demonstrated plasmonic photoconductive antennas has been limited by bandwidth constraints of their antennas and photoconductor parasitics. Here, ...
متن کامل