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Enhanced Raman scattering from self-affine thin films.

E Y Poliakov, V M Shalaev, V A Markel

|November 3, 2009

Summary

Surface-enhanced Raman scattering (SERS) is significantly amplified by self-affine surfaces. A new theory explains this phenomenon using surface eigenmodes, matching observations in thin films.

Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Surface-enhanced Raman scattering (SERS) is a powerful technique for molecular detection.
Self-affine surfaces exhibit fractal-like properties across different scales.
Understanding SERS enhancement mechanisms on nanostructured surfaces is crucial.

Purpose of the Study:

To develop a theoretical framework for SERS on self-affine surfaces.
To explain the large SERS signals observed from such surfaces.
To investigate the spatial distribution of electromagnetic fields at different frequencies.

Main Methods:

Development of a theoretical model based on the eigenmodes of self-affine surfaces.
Comparison of theoretical predictions with experimental SERS data from cold-deposited thin films.

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Analysis of spatial distributions of local electromagnetic fields.

Main Results:

The developed theory successfully explains the large SERS signals from self-affine surfaces.
Observed SERS from cold-deposited thin films with self-affine structures are well-accounted for by the theory.
Local field distributions at fundamental and Stokes frequencies are highly inhomogeneous, featuring localized 'hot zones'.

Conclusions:

Self-affine surface geometry is a key factor in achieving large SERS enhancements.
The eigenmode theory provides a robust explanation for SERS on these surfaces.
Inhomogeneous field distributions and spatially separated hot zones influence SERS signal characteristics.