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Type: Journal article
Title: Modelling of sub-wavelength THz sources as Gaussian apertures
Author: Lin, H.
Fumeaux, C.
Fischer, B.
Abbott, D.
Citation: Optics Express, 2010; 18(17):17672-17683
Publisher: Optical Soc Amer
Issue Date: 2010
ISSN: 1094-4087
Statement of
Hungyen Lin, Christophe Fumeaux, Bernd M. 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 comprehensively investigates Gaussian apertures in focused THz radiation generation in electro-optical crystals and illustrates the breakdown of the paraxial approximation at low THz frequencies. The findings show that the shape of the radiation pattern causes a reduction in detectable THz radiation and hence contributes significantly to low signal-to-noise ratio in THz radiation generation. Whilst we have demonstrated the findings on optical rectification in this paper, the model may apply without a loss of generality to other types of apertures sources in THz radiation generation.
Keywords: Normal Distribution; Spectrum Analysis; Infrared Rays; Models, Theoretical; Fiber Optic Technology; Terahertz Imaging; Crystallization; Equipment Design
Rights: © 2010 Optical Society of America
RMID: 0020101254
DOI: 10.1364/OE.18.017672
Appears in Collections:Electrical and Electronic Engineering publications

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