Vibrational Nanospectroscopy by Observation of Molecular Free Induction Decay with Ultrafast Infrared Near-field Scattering
|Date and time||
Nov 15, 2011
from 11:10 AM to 12:00 PM
|Location||60 St. George Street, MP 606|
University of Colorado at Boulder
Scattering type near-field optical microscopy (s-SNOM) combined with coherent ultrafast mid infrared light source can provide a time domain approach to vibrational spectroscopy at nanometer scale. The molecular free induction decay behavior is observed with tip scattering and phase sensitive heterodyne detection, asymmetric FT-IR measurements are carried out on surface polymer samples. This approach demonstrates vibrational spectroscopy with sub-diffraction limit spatial resolution and enables spectroscopic studies on heterogeneous samples that suffer from spatial inhomogeneous broadening. High sensitivity of about one thousand vibrational bonds is also demonstrated. A prospective time resolved pump/probe implementation with IR s-SNOM will be discussed.
PLEASE NOTE NON STANDARD DAY.
|Contact Name||Joane Magnaye|