Beam profiling of a commercial lens-assisted terahertz time domain spectrometer

Research output: Contribution to journalArticlepeer-review

Standard

Beam profiling of a commercial lens-assisted terahertz time domain spectrometer. / Freer, Suzanna; Gorodetsky, Andrei; Navarro-Cia, Miguel.

In: IEEE Transactions on Terahertz Science and Technology, Vol. 11, No. 1, 01.01.2021, p. 90-100.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

Bibtex

@article{7175a5b815c44e28a71586e2c84ca135,
title = "Beam profiling of a commercial lens-assisted terahertz time domain spectrometer",
abstract = "To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. Using primarily pinhole scanning methods, along with stepwise angular spectrum simulations, we investigate the profile and polarization characteristics of the beam emitted by a commercial silicon-lensintegrated THz photoconductive antenna and collimated by a TPX (polymethylpentene) lens. Our study flags the limitations of the different beam profiling methods and their impact on the beam Gaussianity estimation. A non-Gaussian asymmetric beam is observed, with main lobe beam waists along x and y varying from 8.4±0.7 mm and 7.7±0.7 mm at 0.25 THz, to 1.4±0.7 mm and 1.4±0.7 mm at 1 THz, respectively. Additionally, we report a maximum cross-polar component relative to the on-axis co-polar component of -11.6 dB and -21.2 dB, at 0.25 THz and 1 THz, respectively.",
keywords = "beam profile, edge diffraction, Gaussian beams, imaging, quasi-optics, terahertz, time-domain spectrometer",
author = "Suzanna Freer and Andrei Gorodetsky and Miguel Navarro-Cia",
year = "2021",
month = jan,
day = "1",
doi = "10.1109/TTHZ.2020.3026656",
language = "English",
volume = "11",
pages = "90--100",
journal = "IEEE Transactions on Terahertz Science and Technology",
issn = "2156-342X",
publisher = "IEEE Xplore",
number = "1",

}

RIS

TY - JOUR

T1 - Beam profiling of a commercial lens-assisted terahertz time domain spectrometer

AU - Freer, Suzanna

AU - Gorodetsky, Andrei

AU - Navarro-Cia, Miguel

PY - 2021/1/1

Y1 - 2021/1/1

N2 - To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. Using primarily pinhole scanning methods, along with stepwise angular spectrum simulations, we investigate the profile and polarization characteristics of the beam emitted by a commercial silicon-lensintegrated THz photoconductive antenna and collimated by a TPX (polymethylpentene) lens. Our study flags the limitations of the different beam profiling methods and their impact on the beam Gaussianity estimation. A non-Gaussian asymmetric beam is observed, with main lobe beam waists along x and y varying from 8.4±0.7 mm and 7.7±0.7 mm at 0.25 THz, to 1.4±0.7 mm and 1.4±0.7 mm at 1 THz, respectively. Additionally, we report a maximum cross-polar component relative to the on-axis co-polar component of -11.6 dB and -21.2 dB, at 0.25 THz and 1 THz, respectively.

AB - To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. Using primarily pinhole scanning methods, along with stepwise angular spectrum simulations, we investigate the profile and polarization characteristics of the beam emitted by a commercial silicon-lensintegrated THz photoconductive antenna and collimated by a TPX (polymethylpentene) lens. Our study flags the limitations of the different beam profiling methods and their impact on the beam Gaussianity estimation. A non-Gaussian asymmetric beam is observed, with main lobe beam waists along x and y varying from 8.4±0.7 mm and 7.7±0.7 mm at 0.25 THz, to 1.4±0.7 mm and 1.4±0.7 mm at 1 THz, respectively. Additionally, we report a maximum cross-polar component relative to the on-axis co-polar component of -11.6 dB and -21.2 dB, at 0.25 THz and 1 THz, respectively.

KW - beam profile

KW - edge diffraction

KW - Gaussian beams

KW - imaging

KW - quasi-optics

KW - terahertz

KW - time-domain spectrometer

U2 - 10.1109/TTHZ.2020.3026656

DO - 10.1109/TTHZ.2020.3026656

M3 - Article

VL - 11

SP - 90

EP - 100

JO - IEEE Transactions on Terahertz Science and Technology

JF - IEEE Transactions on Terahertz Science and Technology

SN - 2156-342X

IS - 1

ER -