Time-Domain Observation of Surface-Enhanced Coherent Raman Scattering with 105–106 Enhancement
| Autor: | Pardeep Kumar, Hikaru Kuramochi, Tahei Tahara, Satoshi Takeuchi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry 010402 general chemistry 01 natural sciences 0104 chemical sciences 010309 optics symbols.namesake Fourier transform 0103 physical sciences Femtosecond symbols Optoelectronics General Materials Science Time domain Physics::Chemical Physics Physical and Theoretical Chemistry Surface plasmon resonance business Raman spectroscopy Spectroscopy Ultrashort pulse Raman scattering |
| Zdroj: | The Journal of Physical Chemistry Letters. 11:6305-6311 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.0c01411 |
| Popis: | Combining surface-enhanced Raman scattering (SERS) with the coherent nonlinear Raman technique is a promising route for achieving higher sensitivity and time-resolved SERS measurements, yet such attempts have just been started. Here, we report time-domain Raman measurements of trans-1,2-bis(4-pyridyl)ethylene (BPE) adsorbed on gold nanoparticle assemblies (GNAs), which were carried out with impulsive stimulated Raman spectroscopy using sub-8 fs pulses. We observe coherent nuclear wavepacket motion of BPE on GNAs with drastic enhancement through the surface plasmon resonance, which provides information on the Raman-active vibrations in the time domain. Through Fourier transform of the measured time-domain Raman data, we obtained SERS spectra of BPE on GNAs with enhancement factors as high as 105-106. The present study not only demonstrates applicability of time-domain nonlinear Raman techniques in SERS, i.e., surface-enhanced impulsive stimulated Raman spectroscopy (SE-ISRS), but also provides a technical basis for femtosecond time-resolved SE-ISRS experiments to track ultrafast dynamics of the adsorbates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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