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Type: Conference paper
Title: Near-field & far-field modelling of a sub-wavelength THz source
Author: Lin, H.
Fumeaux, C.
Fischer, B.
Abbott, D.
Citation: IRMMW-THz 2011: 36th International Conference on Infrared, Millimeter, and Terahertz Waves: pp.1-2
Publisher: IEEE
Publisher Place: USA
Issue Date: 2011
Series/Report no.: International Conference on Infrared Millimeter and Terahertz Waves
ISBN: 9781457705090
ISSN: 2162-2027
Conference Name: International Conference on Infrared, Millimeter and Terahertz Waves (36th : 2011 : Houston, Texas)
Editor: Koch, M.
Statement of
Hungyen Lin, Christophe Fumeaux, Bernd Michael Fischer, and Derek Abbott
Abstract: The THz emission point on a nonlinear electro-optical crystal for generating broadband THz radiation is modeled as a radiating Gaussian aperture. With the wavelengths of the infrared pump beam being much smaller than the wavelength components of the generated THz pulse, a THz sub-wavelength radiating aperture with Gaussian profile is effectively created. This paper investigates this general modelling approach for focused THz radiation generation in electro-optical crystals. Different implementations are employed for the near- and far-field regime. While a numerical approach is required to characterize near-field intensity distributions, a semi-analytical model is sufficient for far-field considerations. The near-field study has ramifications in THz near-field focused beam techniques while far-field investigations elucidate the radiation pattern shape and hence the detectable SNR.
Rights: Copyright 2011 IEEE
DOI: 10.1109/irmmw-THz.2011.6104774
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