Direct observation of single molecules is an ultimate experimental technique to study chemical reactions and catalytic processes on surfaces. In Nanoscale Surface Chemistry group we investigate molecular dynamics on surfaces using low-temperature scanning probe microscopy.
Giant enhancement of Raman scattering using plasmonic nanostructures has attracted increasing interest because of its potential for ultrasensitive chemical analysis, known as surface- and tip-enhanced Raman scattering/spectroscopy. We now demonstrated that dramatic enhancement of Raman scattering can be obtained at molecular point contacts. This enhancement commonly occur not only for various metal substrates [LINK].
Light scattering from plasmonic nanojunctions is routinely used to assess their optical properties. However, the microscopic mechanism remains imperfectly understood. In our latest paper, we show inelastic light scattering (ILS) from plasmonic scanning tunneling microscope (STM) junctions under ultrahigh vacuum and cryogenic conditions [LINK].
Sub-molecular photoluminescence – Photoluminescence spectroscopy using atomic-scale light reveals an optical transition of a single molecule at sub-nanometre resolution [LINK].
In this paper, we demonstrate dramatic enhancement of Raman scattering at “atomic-point contact” using low-temperature tip-enhanced Raman spectroscopy [LINK].