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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 10 — May. 15, 2006
  • pp: 4486–4493

Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna

Yuichi Hirota, Ryo Hattori, Masahiko Tani, and Masanori Hangyo  »View Author Affiliations

Optics Express, Vol. 14, Issue 10, pp. 4486-4493 (2006)

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Generation and modulation of circularly polarized terahertz electromagnetic radiation have been demonstrated by using a four-contact photoconductive antenna and a total-reflection Si prism. The quality of the circularly polarized terahertz pulsed radiation has been evaluated by using a polarization sensitive terahertz time-domain spectroscopy system. The characteristic of the dynamic modulation between the left and right circularly polarized states of the THz radiation is also evaluated. The ellipticity of the modulated circularly polarized THz radiation without a polarizer is not as good as that of the non-modulated because of the non-uniform bias field distribution and the asymmetric pump laser intensity profile on the photoconductive gap.

© 2006 Optical Society of America

OCIS Codes
(230.5440) Optical devices : Polarization-selective devices
(300.6270) Spectroscopy : Spectroscopy, far infrared
(300.6380) Spectroscopy : Spectroscopy, modulation

ToC Category:
Optical Devices

Original Manuscript: February 15, 2006
Revised Manuscript: May 1, 2006
Manuscript Accepted: May 1, 2006
Published: May 15, 2006

Yuichi Hirota, Ryo Hattori, Masahiko Tani, and Masanori Hangyo, "Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna," Opt. Express 14, 4486-4493 (2006)

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