Spatial polarization variation in terahertz electromagnetic wave focused by off-axis parabolic mirror

Mayuko Takai, Kazunori Shibata, Mitsuharu Uemoto, Shinichi Watanabe

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We have investigated the spatial distribution of the polarization state of a terahertz electromagnetic wave focused by an off-axis parabolic mirror (OPM) in the focal plane. We employed polarization-resolved terahertz time-domain spectroscopy and found that a steep spatial variation in the polarization state appears slightly distant from the focus when a linearly polarized terahertz wave is focused. The spatial variation includes an abrupt change in the polarization state (states change between circular and linear polarizations) within a wavelength. The observed phenomena are confirmed by numerical calculations and are shown to be intrinsic to the reflection from the OPM.

Original languageEnglish
Article number052206
JournalApplied Physics Express
Issue number5
Publication statusPublished - 2016 May 1


ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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