Contrast variation in surface plasmon field‐enhanced Raman spectroscopy
| Autor: | Wolfgang Knoll, Axel Nemetz |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Permittivity
Chemistry Surface plasmon Analytical chemistry Physics::Optics General Physics and Astronomy Dielectric Molecular physics Surface plasmon polariton Condensed Matter::Materials Science symbols.namesake Polariton symbols Physical and Theoretical Chemistry Raman spectroscopy Plasmon Raman scattering |
| Zdroj: | The Journal of Chemical Physics. 97:7835-7837 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.463455 |
| Popis: | Plasmon surface polaritons (PSPs) are used for the enhancement of Raman scattered signals from an alkyl‐thiol monolayer HS(CH2)21OH (with dielectric constant eT) at a metal/dielectric interface with dielectric constants em and eamb, respectively. We investigate the intensity ratio of the symmetric and asymmetric CH2 Raman band which has been proven to be sensitive to the polarization of the exciting PSPs. Since the PSP‐polarization also depends on the dielectric constant of the dielectric ambient eamb we show that a variation of eamb influences the CH2 Raman bands. In doing so we present experimental proof for a refined theoretical description of PSP‐polarization in thin layers sandwiched between a metal and a dielectric in order to allow for contrast variation. |
| Databáze: | OpenAIRE |
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