Location: TU, TNW, Collegezaal G (F207)

Time: 13:30 - 14:30 hrs

Prof. Masayoshi Tonouchi from Institute of Laser Engineering, Osaka University (Japan) will talk on the " Laser Terahertz Emission Microscope and Its Application ".

Abstract:
Laser terahertz (THz) emission microscope (LTEM) is reviewed. Femtosecond lasers can excite the THz waves in various electronic materials due to ultrafast current modulation. The current modulation is realized by acceleration or deceleration of photo-excited carriers, and thus LTEM visualizes dynamic photo-response of substances. The developed systems have a scanning speed of 6.5x10-5 sec/pixel, and a minimum spatial resolution better than 0.6 μm, which is defined by the laser beam diameter. We also developed pump and probe type LTEM to visualize spatial dynamic carrier response and applied it to study photoconductive switches. In addition, we will discuss its application to material science, device evaluation, etc.

Ref.  M. Tonouchi, "Cutting-edge terahertz technology,  Nature Photonics, Vol. 1, 97(2007)