Abstract
The optical behavior of a terahertz imaging system employing a train of four identical off-axis parabolic mirrors with oblique incidence angle illumination is investigated in this work. The aperture filling and aberrations of a single off-axis parabolic mirror when illuminated by a Gaussian terahertz beam at its focus point is measured and simulated. The amplitude of E-field in transverse electric (TE) and transverse magnetic (TM) polarizations at target plane reveals a significant cross polarization, even when there is zero cross polarization at the source beam, amplitude of which is ∼ 33% of TE polarization. The investigation of the E-field on the detector plane reveals that this ratio is ∼ 1.5% at the detector plane, and the cross polarized E-field at the target plane is rotated back to co polarization. Although its amplitude is negligible, the TM distribution at detector plane is bimodal and tilted about the optical axis.
Original language | English |
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Title of host publication | 2022 16th European Conference on Antennas and Propagation (EuCAP) |
Publisher | IEEE |
Pages | 1-4 |
Number of pages | 4 |
ISBN (Electronic) | 978-88-31299-04-6 |
ISBN (Print) | 978-1-6654-1604-7 |
DOIs | |
Publication status | Published - 2022 |
Event | EuCAP 2022: 2022 16th European Conference on Antennas and Propagation (EuCAP) - Madrid, Spain Duration: 27 Mar 2022 → 1 Apr 2022 |
Conference
Conference | EuCAP 2022 |
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Country/Territory | Spain |
City | Madrid |
Period | 27/03/22 → 1/04/22 |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-careOtherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Keywords
- THz
- sub-millimeter wave
- polarization
- off-axis parabolic mirror