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Opt Express. 2010 Aug 16;18(17):17672-83. doi: 10.1364/OE.18.017672.

Modelling of sub-wavelength THz sources as Gaussian apertures.

Author information

  • 1School of Electrical & Electronic Engineering, The University of Adelaide, SA 5005, Australia. hlin@eleceng.adelaide.edu.au

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.

PMID:
20721154
[PubMed - indexed for MEDLINE]
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