抄録
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.
| 本文言語 | English |
|---|---|
| 論文番号 | 052206 |
| ジャーナル | Applied Physics Express |
| 巻 | 9 |
| 号 | 5 |
| DOI | |
| 出版ステータス | Published - 2016 5月 |
ASJC Scopus subject areas
- 工学（全般）
- 物理学および天文学（全般）