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Metal nanostructures, scattering excitation

Since the HRS scattering cross section is so small, enhancement of the signal intensity is indispensable for a practical use of the HRS technique in the field of molecular science. As already mentioned, one of the methods for signal enhancement is to use plasmonic resonances of metal nanostructures [20, 21, 25]. This enhancement technique is called surface-enhanced hyper-Raman scattering (SEHRS) because it is similar to that of surface-enhanced Raman scattering (SERS). In SERS or SEHRS, both excitation absorption and scattered emission benefit from plasmonic field enhancement. Therefore, the plasmonic enhancement factor M is described as... [Pg.105]

Raman enhancement by SERS is mainly attributed to an electromagnetic (EM) field enhancement via localized optical fields of the metallic nanostmctures that are related to plasmon resonance excitation. The increase of the cross-section with contact between the metal nanostructure and a molecule induces an additional enhancement. Without enhancement by the electrical resonance between incident light and molecules, the total Stokes-Raman signal P (vs) is proportional to the number of molecules in the scattering volume N, the Raman cross-section without surface enhancement and the excitation laser intensity... [Pg.1451]

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Metal nanostructure

Metal nanostructures

Metallic scattering

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