Figure 5
(a) Calculation model illustration of Ag coated Au NPs. \(r_{1}\): radius of Au core, \(r_{2}\): radius of core–shell structure. \(r_{2}\) − \(r_{1}\): Ag thickness. (b) and (c) Calculated values of \(C_{sca}\) for different \(R_{{{\text{inc}}}} \left( { = r_{2} /r_{1} } \right)\). Black curves in (b) correspond to the vertical axis on the left side and blue curves in (b) are associated with the vertical axis on the right side. (c) Detailed spectra with \(R_{{{\text{inc}}}} < 1.2\). (d) \(C_{sca}\) values obtained at 325 nm (black solid squares) and 808 nm (red solid circles). Fitting curves: \(C_{sca} = a R_{inc}^{b}\) for 325 nm (black solid curve) and \(C_{sca} = a R_{inc}^{b}\) for 808 nm (red solid curve).
