Simultaneous acquisition of complex transmittance and birefringence with two counter-rotating, circularly polarized THz pulses
Posted on 2018-11-05 - 16:10
Here we demonstrate simultaneous measurements of the complex transmittance and birefringence using left- and right-handed circularly polarized terahertz (THz) pulses. We change the polarization of the THz pulses periodically by modulating the polarization of the pump pulses directed onto a ZnTe (111) crystal, and we convert linear to circular polarization using a broadband THz quarter-wave plate. By integrating the alternating-emission system with the polarization-sensitive terahertz time-domain spectrometer, we are able to obtain the electric-field vector of the transmitted terahertz pulses for both the left- and right-handed circular polarizations. Utilizing this technique, we are able to measure simultaneously the frequency-dependent complex refractive indices (real and imaginary parts) and the orientations of the slow and fast axes of birefringent materials, a quartz disc and a barium borate crystal, in a single temporal sweep.
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Kawada, Yoichi; Yoshioka, Katsumasa; Arashida, Yusuke; Katayama, Ikufumi; Takeda, Jun; Takahashi, Hironori (2018). Simultaneous acquisition of complex transmittance and birefringence with two counter-rotating, circularly polarized THz pulses. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4224410.v1
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AUTHORS (6)
YK
Yoichi Kawada
KY
Katsumasa Yoshioka
YA
Yusuke Arashida
IK
Ikufumi Katayama
JT
Jun Takeda
HT
Hironori Takahashi