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

Mayuko Takai; Kazunori Shibata; Mitsuharu Uemoto; Shinichi Watanabe

doi:10.7567/APEX.9.052206

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

Mayuko Takai, Kazunori Shibata, Mitsuharu Uemoto, Shinichi Watanabe

Department of Physics

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

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 language	English
Article number	052206
Journal	Applied Physics Express
Volume	9
Issue number	5
DOIs	https://doi.org/10.7567/APEX.9.052206
Publication status	Published - 2016 May

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Spatial polarization variation in terahertz electromagnetic wave focused by off-axis parabolic mirror",

abstract = "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.",

author = "Mayuko Takai and Kazunori Shibata and Mitsuharu Uemoto and Shinichi Watanabe",

note = "Funding Information: M.T. and S.W. would like to thank Dr. M. Okano for critical reading of the manuscript. This work was partially supported by the Japan Science and Technology Agency (JST) under Collaborative Research Based on Industrial Demand {"}Terahertz-wave: Towards Innovative Development of Terahertz-wave Technologies and Applications{"}. Publisher Copyright: {\textcopyright} 2016 The Japan Society of Applied Physics.",

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AU - Uemoto, Mitsuharu

AU - Watanabe, Shinichi

N1 - Funding Information: M.T. and S.W. would like to thank Dr. M. Okano for critical reading of the manuscript. This work was partially supported by the Japan Science and Technology Agency (JST) under Collaborative Research Based on Industrial Demand "Terahertz-wave: Towards Innovative Development of Terahertz-wave Technologies and Applications". Publisher Copyright: © 2016 The Japan Society of Applied Physics.

PY - 2016/5

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N2 - 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.

AB - 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.

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

Abstract

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