Tip-enhanced Raman and THz nanospectroscopy
Owing to the long-time collaborations with the students/postdocs/professors from Philippines since I was an exchange student in Instrumentation Physics Laboratory (headed by Prof. Caesar Saloma), NIP, UPD in 1998-1999, tip-enhanced Raman spectroscopy (TERS) has been successfully developed in the various environments such as ambient, liquid, and low temperature (UHV-LT). The spatial resolution and the sensitivity of TERS has been proven to achieve sub-nanometer and single molecule level, respectively. Based on our prediction in 2006, TERS in UHV-LT achieved even the atomistic spatial resolution that visualized the interior of the single molecule.
While TERS and the related techniques showed the unprecedented resolution in space, the resolution in time has been very poor. This fact opened up the second opportunity to reinforce the collaboration with Filipino scientists in the field of THz science. In this presentation, we will introduce our challenge towards ultrafast time resolution up to sub-picosecond based on the combination between scanning probe microscopy and THz spectroscopy.