[13p-N324-1~13] 3.12 Nanoscale optical science and near-field optics

[13p-N324-4] Observation of ultrafast modulation of tunneling current on MIR-STM

〇Masashi Ishikawa¹, Yusuke Arashida¹, Ippo Igarashi¹, Akira Hatanaka¹, Hiroyuki Mogi¹, Shoji Yoshida¹, Osamu Takeuchi¹, Hidemi Shigekawa¹ (1.Univ. of Tsukuba)

Keywords:SPM, Time resolved, femto seconds

Recently, THz-STM has attracted much attention as a method to observe ultrafast phenomena with atomic resolution. In order to observe electron dynamics at femtosecond scale, which is beyond the time resolution of THz-STM, we have been developing a mid-infrared (MIR)-STM using sub-cycle MIR pulses with a shorter pulse duration than THz electric field. In this study, we succeeded in observing ultrafast modulation of the tunneling current less than 20 fs by the mid-infrared pulse, and confirmed that the bandwidth of the incident electric field is maintained.