Presentation Information
[16a-PB4-5]Effect of the tilt angle of a flat-plate sample in focused-transmission measurements using THz-TDS
〇Osamu Morikawa1, Kohji Yamamoto2, Kazuyoshi Kurihara2, Takashi Furuya2, Fumiyoshi Kuwashima3, Hideaki Kitahara2, Masahiko Tani2 (1.JCGA, 2.Univ. Fukui, 3.O. G. Univ.)
Keywords:
THz-TDS,focusing,refractive index
In our previous study, we proposed a calculation method based on the inner product of Gaussian-shaped radiation and detection patterns for the case where a sample is inserted into the electromagnetic wave focusing region of a terahertz time-domain spectroscopy (THz-TDS) system. However, the calculated results did not agree with the experimental measurements, and the influence of axis misalignment caused by tilting of the sample plate was also pointed out. Therefore, in the present study, measurements were performed while varying the tilt angle of the sample plate in the focusing region. As the plate is tilted, the transmittance decreases, particularly at high frequencies (above approximately 100–200 GHz). Moreover, even when the plate is nearly perpendicular, a reduction in transmittance at high frequencies was observed.