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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 18, Iss. 10 — Oct. 1, 2001
  • pp: 1524–1533

Cross-polarized angular emission patterns from lens-coupled terahertz antennas

J. Van Rudd, Jon L. Johnson, and Daniel M. Mittleman  »View Author Affiliations

JOSA B, Vol. 18, Issue 10, pp. 1524-1533 (2001)

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We report detailed measurements of the cross-polarized radiation from lens-coupled terahertz dipole antennas, of the sort commonly used in terahertz time-domain spectroscopy. We compare two different antenna geometries and measure both polarization components as a function of emission angle. The qualitative features of these patterns are not specific to one particular emitter geometry but appear to be generally characteristic of these lens-coupled systems. These measurements are used to determine the angle-dependent ellipticity of the emitted terahertz beam. We conclude that a low f-number collection system (≲f/5) unavoidably results in a beam with a small but measurable ellipticity. This has important implications for any measurements in which a purely linearly polarized wave is required.

© 2001 Optical Society of America

OCIS Codes
(260.3090) Physical optics : Infrared, far
(320.7080) Ultrafast optics : Ultrafast devices
(320.7160) Ultrafast optics : Ultrafast technology

J. Van Rudd, Jon L. Johnson, and Daniel M. Mittleman, "Cross-polarized angular emission patterns from lens-coupled terahertz antennas," J. Opt. Soc. Am. B 18, 1524-1533 (2001)

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