[19a-E205-1~12] 3.6 Ultrashort-pulse and high-intensity lasers

[19a-E205-9] Direct observation of tip enhanced Terahertz waveform in Terahertz-induced scanning tunneling spectroscopy

〇Yusuke Arashida¹, Shoji Yoshida¹, Hideki Hirori², Takehiro Tachizaki³, Ippo Igarashi¹, Katsumasa Yoshioka⁴, Yasuyuki Sanari², Osamu Takeuchi¹, Yoshihiko Kanemitsu², Hidemi Shigekawa¹ (1.Tsukuba Univ., 2.Kyoto Univ., 3.Tokai Univ., 4.Yokohama Natl. Univ.)

Keywords:Scanning tunneling microscopy, Terahertz, near-field

We succeeded direct observation of terahertz near-field localized between a tip and a metal substrate in scanning tunneling microscope.
Experiments were conducted using a fiber laser amplifire (1035 nm, 309 fs, 1 MHz) where the fundamental light and a terahertz wave generated by a LiNbO3 crystal were entered to the tunnel junction simultaneously.
By considering the transient I-V curve of the photo-excited tunnel junction, we established to retrieve the waveform of the terahertz near-field.