Figure 3. Dipole-based modeling for randomly distributed silver nanoparticles.

(a) Induced charge distributions in the silver nanostructures, showing magnified view below. (b) A schematic diagram of a silver nanoparticle, identified by the index i. The position of the center of gravity is given by G⁽ⁱ⁾, and a dipole d⁽ⁱ⁾ = d⁽ⁱ⁾ exp(iϕ⁽ⁱ⁾) based on the imbalance of induced electron charges with respect to G⁽ⁱ⁾. (c) A schematic diagram of the induced dipoles, showing magnified view below.