Modelling of sub-wavelength THz sources as Gaussian apertures

Lin, Hungyen and Fumeaux, Christophe and Fischer, Bernd M. and Abbott, Derek (2010) Modelling of sub-wavelength THz sources as Gaussian apertures. Optics Express, 18 (17). pp. 17672-17683. ISSN 1094-4087

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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 break-down 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.

Item Type: Journal Article
Journal or Publication Title: Optics Express
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
Departments: Faculty of Science and Technology > Engineering
ID Code: 76839
Deposited By: ep_importer_pure
Deposited On: 24 Nov 2015 10:32
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 08:41
URI: https://eprints.lancs.ac.uk/id/eprint/76839

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