Abstract

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

Full Article  |  PDF Article
Related Articles
Terahertz pulse propagation in the near field and the far field

Andreas Gürtler, Carsten Winnewisser, Hanspeter Helm, and Peter Uhd Jepsen
J. Opt. Soc. Am. A 17(1) 74-83 (2000)

Quadrupole radiation from terahertz dipole antennas

J. V. Rudd, Jon L. Johnson, and Daniel M. Mittleman
Opt. Lett. 25(20) 1556-1558 (2000)

Time reversal and object reconstruction with single-cycle pulses

A. Boh Ruffin, Joan Decker, Laurent Sanchez-Palencia, Lénaic Le Hors, John F. Whitaker, Theodore B. Norris, and J. V. Rudd
Opt. Lett. 26(10) 681-683 (2001)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (12)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription