Surface-Enhanced Impulsive Coherent Vibrational Spectroscopy.

Abstract:

:Surface-enhanced Raman spectroscopy (SERS) has attracted a lot of attention in molecular sensing because of the remarkable ability of plasmonic metal nanostructures to enhance the weak Raman scattering process. On the other hand, coherent vibrational spectroscopy triggered by impulsive excitation using ultrafast laser pulses provides complete information about the temporal evolution of molecular vibrations, allowing dynamical processes in molecular systems to be followed in "real time". Here, we combine these two concepts and demonstrate surface-enhanced impulsive vibrational spectroscopy. The vibrational modes of the ground and excited states of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), spin-coated on a substrate covered with monodisperse silver nanoparticles, are impulsively excited with a sub-10 fs pump pulse and characterized with a delayed broad-band probe pulse. The maximum enhancement in the spectrally and temporally resolved vibrational signatures averaged over the whole sample is about 4.6, while the real-time information about the instantaneous vibrational amplitude together with the initial vibrational phase is preserved. The phase is essential to determine the vibrational contributions from the ground and excited states.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Du J,Harra J,Virkki M,Mäkelä JM,Leng Y,Kauranen M,Kobayashi T

doi

10.1038/srep36471

subject

Has Abstract

pub_date

2016-11-04 00:00:00

pages

36471

issn

2045-2322

pii

srep36471

journal_volume

6

pub_type

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