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Contribution to SERS of Surface Plasmon Polariton Modes on Sinusoidal Metal Surface

Electromagnetic field intensity is calculated numerically near a sinusoidal metal surface and for a p-polarized incident wave. We define the magnitude of electromagnetic enhancement in SERS by the electric field strength on the metal surface, which is enhanced at the resonance of a surface plasmon polariton (SPP) mode. Then we have the enhancement factor to be at most 100, which is much smaller than the observed enhancement.