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  • Vol. 25, Iss. 20 — Oct. 15, 2000
  • pp: 1556–1558

Quadrupole radiation from terahertz dipole antennas

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


Optics Letters, Vol. 25, Issue 20, pp. 1556-1558 (2000)
http://dx.doi.org/10.1364/OL.25.001556


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Abstract

We report what is to our knowledge the first detailed investigation of the polarization state of radiation from lens-coupled terahertz dipole antennas. The radiation exhibits a weak but measurable component that is polarized orthogonally to the orientation of the emitter dipole. The angular radiation pattern of this cross-polarized emission reveals that it is quadrupolar, rather than dipolar, in nature. One can understand this result by taking into account the photocurrent flowing in the strip lines that feed the dipole antenna. A Fresnel–Kirchhoff scalar diffraction calculation is used for calculating the frequency-dependent angular distribution of the radiation pattern, providing satisfactory agreement with the measurements.

© 2000 Optical Society of America

OCIS Codes
(260.5150) Physical optics : Photoconductivity
(260.5430) Physical optics : Polarization
(320.7080) Ultrafast optics : Ultrafast devices

Citation
J. V. Rudd, Jon L. Johnson, and Daniel M. Mittleman, "Quadrupole radiation from terahertz dipole antennas," Opt. Lett. 25, 1556-1558 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-20-1556


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