[19a-P3-1~14] 3.9 Terahertz technologies

[19a-P3-13] Influence of Photo-excitation for Transmitted Terahertz Waveform in Silicon

〇(M1C)Hideki Sasajima¹, Yuta Kasashima², Jessica Afalla³, Takeshi Moriyasu¹, Masahiko Tani³, Hideaki Kitahara³, Toshiro Kohmoto⁴, Mitsutaka Kumakura¹ (1.Grad. Sch. of Eng. Univ. of Fukui, 2.Fac. of Eng. Univ. of Fukui, 3.FIR Univ. of Fukui, 4.Grad. Sch. of Sci. Kobe Univ.)

Keywords:terahertz, carrier dynamics, sillicone

The carrier dynamics of photo-excited Si is investigated by the optical
pump-THz-probe spectroscopy. We discussed the carrier dynamics from a
viewpoint of the change of the THz electric waveform caused by
photo-excitation. Negative delay of the transmitted terahertz pulse was
observed under the photo-excitation, and the obtained refractive index is
analyzed by using the Drude model by optical constants depended on the
carrier density.