Figure 13.

(a) $G_{SERS}$ distribution inside the 2 nm gap formed by two gold nanoparticles with a radius of 30 nm. The enhancement is calculated at the wavelength at which it reaches its maximum value. (b) Variation of $G_{SERS}$ along the (curved) surface of the nanoparticle (thin black line); the thick black line is not commented in this paper. Reproduced with permission from Etchegoin et al. [16].