[15p-2E-1~12] 4.7 Terahertz Photonics

▲ [15p-2E-10] Time-Resolved Observation of Dynamical Franz-Keldysh Effect under Coherent Multi-Cycle Terahertz Pulses

〇Hideki Hirori^1,2, Kento Uchida¹, Koichiro Tanaka¹, Tomohito Otobe³, Toshimitsu Mochizuki⁴, Changsu Kim⁴, Masahiro Yoshita⁴, Hidefumi Akiyama⁴, Loren Pfeiffer⁵, Ken West⁵ (1.Kyoto Univ., 2.JST-PRESTO, 3.JAEA, 4.Univ. of Tokyo, 5.Princeton Univ.)

Keywords:Nonlinear THz spectroscopy

We measured the absorption changes near the bandgap of GaAs QW driven by an alternating THz field using multi-cycle THz-pump and NIR probe experiments. We found that a phase shift between the modulation of the absorption change and the applied pump field appears and it becomes significant as the electric field decreases.