On the basis of different types of experiments, the authors develop implicitly the model of surface-enhanced Raman scattering (SERS) of adsorbates on metal surfaces. The long-range enhancement by resonances of the macroscopic laser and Stokes field is separated quantitatively from the metal electron-mediated resonance Raman effect. The latter mechanism proceeds by increased electron-photon coupling at an atomically rough surface and by temporary charge transfer to orbitals of the adsorbates. This model can account for the chemical specificity and vibrational selectivity of SERS and (partly) for the SERS specificity of the various metals.

https://iopscience.iop.org/article/10.1088/0953-8984/4/5/001/pdf

Surface-enhanced Raman scattering

A review of fluorescence near interfaces is presented. Recent work that examines the role of photonic mode density in this process is surveyed and the underlying concepts discussed. The review includes an examination of the role of surface and waveguide modes, as well as non-radiative decay. The importance of textured surfaces in providing large changes in photonic mode density and in coupling non-radiative modes to radiation is highlighted. Indications are given for future areas of research and on how photonic mode density may influence optical processes other than fluorescence.

Fluorescence near interfaces: The role of photonic mode density

The nature and properties of surface-enhanced vibrational spectra of molecules adsorbed on surfaces that can enhance the absorption and the emission of electromagnetic radiation are discussed. Examples of surface-enhanced resonant Raman scattering, surface-enhanced Raman scattering in the near-infrared and surface-enhanced infrared are given. The rough surfaces used are metal island films coated with a nanometric organic film using the Langmuir-Blodgett technique or deposited by vacuum evaporation.

/pdf/surface-enhanced-vibrational-spectroscopy-2cv91632hb.pdf

Surface enhanced vibrational spectroscopy

A review ofuorescence near interfaces is presented. Recent work that examines the role of photonic mode density in this process is surveyed and the underlying concepts discussed. The review includes an examination of the role of surface and waveguide modes, as well as non-radiative decay. The importance of textured surfaces in providing large changes in photonic mode density and in coupling non-radiative modes to radiation is highlighted. Indications are given for future areas of research and on how photonic mode density may inuence optical processes other thanuorescence.

Topical review Fluorescence near interfaces: the role of photonic mode density

This article provides an overview of the development and application of the surface-enhanced Raman scattering (SERS) techniques using metal-coated nanostructures on solid substrates An introduction to theoretical principles of the SERS effect and the different SERS-active media is presented The focus is on nanostructured solid substrates and their practical applications in chemical, environmental and biomedical areas Specific examples of analytical techniques, instruments and sensors developed in the author's laboratory will be discussed to illustrate the usefulness and potential of the SERS techniques

Surface-enhanced Raman spectroscopy using metallic nanostructures

Surface-enhanced Raman spectrometry with silver particles on stochastic-post substrates

Exceptionally strong Raman enhancements have been observed for molecules adsorbed on silver deposited onto etched quartz substrates. A stochastic arrangement of tall quartz posts, with an average spacing of approx. 110 nm, is obtained by plasma etching of SiO/sub 2/ using a silver island film as an etch mask. Silver particles are produced by angle evaporation. Raman enhancment for adsorbed p-nitrobenzoic acid is maximized by optimizing the deposition parameters, which results in a tenfold enhancement compared to island films and crossed-grating structures. Observation of signals from several polyaromatic molecules demonstrates that the surface provides strong Raman enhancement for a variety of adsorbates. 30 references, 3 figures, 2 tables.

M. Meier

Papers

Surface-enhanced Raman spectrometry with silver particles on stochastic-post substrates

Silver particles on stochastic quartz substrates providing tenfold increase in Raman enhancement