Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors

Pouyan Rezapoor; Aleksi  Tamminen; Aleksi  Tamminen; Juha Ala-Laurinaho; Nuria Llombart; Helena  Rodilla; Jan Stake; Zachary D. Taylor

doi:10.23919/EuCAP53622.2022.9769500

Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors

Pouyan Rezapoor, Aleksi Tamminen, Aleksi Tamminen, Juha Ala-Laurinaho, Nuria Llombart, Helena Rodilla, Jan Stake, Zachary D. Taylor

Tera-Hertz Sensing

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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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
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	https://doi.org/10.23919/EuCAP53622.2022.9769500
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
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-care
Otherwise 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

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10.23919/EuCAP53622.2022.9769500

Cross_polarization_in_swept_beam_THz_imaging_systems_using_off_axis_parabolic_mirrorsFinal published version, 10.2 MB

Cite this

@inproceedings{8f979324993f428492fe9c365218a5d7,

title = "Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors",

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.",

keywords = "THz, sub-millimeter wave, polarization, off-axis parabolic mirror",

author = "Pouyan Rezapoor and Aleksi Tamminen and Aleksi Tamminen and Juha Ala-Laurinaho and Nuria Llombart and Helena Rodilla and Jan Stake and Taylor, {Zachary D.}",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise 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. ; EuCAP 2022 : 2022 16th European Conference on Antennas and Propagation (EuCAP) ; Conference date: 27-03-2022 Through 01-04-2022",

year = "2022",

doi = "10.23919/EuCAP53622.2022.9769500",

language = "English",

isbn = "978-1-6654-1604-7",

pages = "1--4",

booktitle = "2022 16th European Conference on Antennas and Propagation (EuCAP)",

publisher = "IEEE",

address = "United States",

}

Rezapoor, P, Tamminen, A, Tamminen, A, Ala-Laurinaho, J, Llombart, N, Rodilla, H, Stake, J & Taylor, ZD 2022, Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors. in 2022 16th European Conference on Antennas and Propagation (EuCAP)., 9769500, IEEE, pp. 1-4, EuCAP 2022, Madrid, Spain, 27/03/22. https://doi.org/10.23919/EuCAP53622.2022.9769500

Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors. / Rezapoor, Pouyan; Tamminen, Aleksi ; Tamminen, Aleksi et al.
2022 16th European Conference on Antennas and Propagation (EuCAP). IEEE, 2022. p. 1-4 9769500.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors

AU - Rezapoor, Pouyan

AU - Tamminen, Aleksi

AU - Ala-Laurinaho, Juha

AU - Llombart, Nuria

AU - Rodilla, Helena

AU - Stake, Jan

AU - Taylor, Zachary D.

N1 - 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-care Otherwise 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.

PY - 2022

Y1 - 2022

N2 - 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.

AB - 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.

KW - THz

KW - sub-millimeter wave

KW - polarization

KW - off-axis parabolic mirror

U2 - 10.23919/EuCAP53622.2022.9769500

DO - 10.23919/EuCAP53622.2022.9769500

M3 - Conference contribution

SN - 978-1-6654-1604-7

SP - 1

EP - 4

BT - 2022 16th European Conference on Antennas and Propagation (EuCAP)

PB - IEEE

T2 - EuCAP 2022

Y2 - 27 March 2022 through 1 April 2022

ER -

Cross polarization in swept beam THz imaging systems using off-axis parabolic mirrors

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Keywords

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