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Updated: Jun 26, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
Terahertz Bessel-Gauss beams of radial and azimuthal polarization from microstructured photoconductive antennas
S Winnerl1, B Zimmermann, F Peter
1Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden Rossendorf, Dresden, Germany. s.winnerl@fzd.de
Abstract:
We report on emission and detection of pulsed terahertz radiation of radial and azimuthal polarization by microstructured photoconductive antennas. To this end the electrode geometry of the emitter is inverse to the desired THz field pattern and a second periodic structure prevents destructive interference effects. Beam profiles of freely propagating THz waves are studied for divergent and refocused beams. They can be well described as the lowest order Bessel-Gauss modes with a divergence comparable to linearly polarized Gaussian beams. Additionally, mode sensitive detection is demonstrated for radially polarized radiation.
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