Free-space sub-terahertz field-polarization controlled by waveguide-mode-selection

• URL: http://arxiv.org/abs/2002.03200v4
• Date: Sat, 28 Aug 2021 18:30:58 GMT
• Title: Free-space sub-terahertz field-polarization controlled by waveguide-mode-selection
• Authors: Marc Westig, Holger Thierschmann, Allard Katan, Matvey Finkel, Teun M. Klapwijk
• Abstract summary: We study the free-space electro-magnetic field emitted from a multimode rectangular waveguide equipped with a diagonal-horn antenna. We find that the radiated field, excited by the fundamental waveguide mode, is characterized by a linear polarization.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study experimentally the free-space electro-magnetic field emitted from a multimode rectangular waveguide equipped with a diagonal-horn antenna. Using the frequency range of 215-580 GHz, a photo-mixer is used to launch a free-space circularly-polarized electro-magnetic field, exciting multiple modes at the input of the rectangular waveguide via an input diagonal-horn antenna. A second photo-mixer is used, together with a silicon mirror Fresnel scatterer, to act as a polarization-sensitive coherent detector to characterize the emitted field. We find that the radiated field, excited by the fundamental waveguide mode, is characterized by a linear polarization. In addition, we find that the polarization of the radiated field rotates by 45 degree if selectively exciting higher-order modes in the waveguide. Despite the higher-order modes, the radiated field appears to maintain a predominant Gaussian beam character, since an unidirectional coupling to a detector was possible, whereas the unidirectionality is independent of the frequency. We discuss a possible application of this finding.

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