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Figure 8
Simulation of a Vlasov antenna with 300 GHz central frequency. The tube has a radius of 450 µm, a layer thickness of 100 µm, and [\varepsilon^{\,\prime}] = 3.8 (fused silica). The cut angle has been varied between 25° and 65°. Lower left: perpendicular to the plane component of the Poynting flux through a plane perpendicular to forward direction. The Poynting flux is calculated by a far-field to near-field transformation into the plane with minimal r.m.s. dimensions of the pattern; k is the wavenumber. Lower right: vector components of the electric field in the far zone for [{\bf e}_{r}] = [x^{\prime}({{\sin\theta}/{\theta}})\,{\bf e}_{x}] + [y^{\prime}({{\sin\theta}/{\theta}})\,{\bf e}_{y}] + [\cos\theta\,{\bf e}_{z}] with [\theta] = [({x^{\prime 2}+y^{\prime 2}})^{1/2}]. The real and imaginary parts are shown in blue and red.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 1| January 2021| Pages 18-27
https://doi.org/10.1107/S1600577520014058
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