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https://hdl.handle.net/2440/62034
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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 1094-4087 |
Statement of Responsibility: | 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 |
DOI: | 10.1364/OE.18.017672 |
Published version: | http://dx.doi.org/10.1364/oe.18.017672 |
Appears in Collections: | Aurora harvest 5 Electrical and Electronic Engineering publications |
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