Ultrafast plasmon dynamics and evanescent field distribution of reproducible surface-enhanced Raman-scattering substrates
| Autor: | Jörg Petschulat, Benjamin Dietzek, Andreas Tünnermann, Robert Möller, Ronald Siebert, Roland Mattheis, Henrik Schneidewind, U. Hübner, Jiirgen Popp, Thomas Pertsch, Dana Cialla |
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| Rok vydání: | 2009 |
| Předmět: |
Time Factors
Evanescent wave Field (physics) Surface Properties Metal Nanoparticles Nanotechnology Statistics::Other Statistics engineering.material Spectrum Analysis Raman Sensitivity and Specificity Biochemistry Analytical Chemistry symbols.namesake Optics Particle Size Physics::Chemical Physics Spectroscopy Plasmon Microscopy Confocal business.industry Chemistry Reproducibility of Results symbols engineering Noble metal Gold Time-resolved spectroscopy business Ultrashort pulse Raman scattering |
| Zdroj: | Analytical and Bioanalytical Chemistry. 394:1811-1818 |
| ISSN: | 1618-2650 1618-2642 |
| DOI: | 10.1007/s00216-009-2749-1 |
| Popis: | Surface-enhanced Raman scattering (SERS) is a potent tool in bioanalytical science because the technique combines high sensitivity with molecular specificity. However, the widespread and routine use of SERS in quantitative biomedical diagnostics is limited by tight requirements on the reproducibility of the noble metal substrates used. To solve this problem, we recently introduced a novel approach to reproducible SERS substrates. In this contribution, we apply ultrafast time-resolved spectroscopy to investigate the photo-induced collective charge-carrier dynamics in such substrates, which represents the fundamental origin of the SERS mechanism. The ultrafast experiments are accompanied by scanning-near field optical microscopy and SERS experiments to correlate the appearance of plasmon dynamics with the resultant evanescent field distribution and the analytically relevant SERS enhancement. |
| Databáze: | OpenAIRE |
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