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\section{Surface \section{Self-assembled Nanocluster Arrays (NCA) for Tuned Surface Enhanced Raman Scattering (SERS)}  Surface  Plasmon Resonance in Noble Metal Nanoparticles} Nanoparticles\\  Surface plasmon resonance (SPR) is a culminated oscillation of conduction electrons (typically in a noble metal) where the electrons are dragged from their equilibrium positions due to the applied electromagnetic field. When the wavelength of light is much longer than the nanoparticle’s size, the applied electromagnetic field (usually the incident light) can push free electrons away from the metal particle in one direction, creating a dipole that can shift direction with the change in electric field (Fig. 19). Usually the polarization is driven by visible or near infrared light. [18, 19]