Abstract
A metallic nanoparticle (NP) located near the film acts as a nanoantenna. Surface plasmons, excited by light in a particle and in a film, transform the electromagnetic field, confine it and strongly amplify it in the gap between the particle and the film. The enhancement of the field depends on many factors: the size and shape of NP, the permeability of all materials, the wavelength of light, the thickness of the film, the angle of the light beam and very much from the gap between the particle and the film. The amplification of the field in a narrow gap (~ 1 nm) can be 10^3 or more and the enhancement of Raman radiation can reach enormous values of ~ 10^10–10^11.
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