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The roles of the species dissolved in the liquid in the course of NPs formation during the PLAL as well as the effects of organic solvents in the stabilization of the colloids obtained remain debating. The pulsed laser ablation in liquid (PLAL) is a promising method to prepare copper/copper oxide nanoparticles (NPs), with the liquid used being an important factor to control their properties. These points are important for detection techniques based on LSPR peak. The scattering contribution in extinction spectra was affected more by shell size than dielectric coefficient. The LSPR peak is damped by increasing shell thickness and host dielectric coefficient too. The energy of LSPR absorption peak is independent of shell thickness and host dielectric coefficient. Also, the LSPR absorption peak is damped by decreasing Cu core size and dielectric coefficient of shell. Shift of LSPR peak is more affected by the dielectric coefficient of shell than Cu core size particularly for Cu core diameter above 4nm. From simulation it was found that scattering and luminescence have an important effect on the energy, width and shape of LSPR absorption peak. Mie absorption of Cu cores, scattering from Cu2O shell and luminescence that rises from carrier transfer in interface were employed to fit the whole range of visible extinction spectrum of these core–shells. By co-deposition via RF-Sputtering and RF-PECVD methods and using Cu target and acetylene gas, we prepared core–shell nanoparticles on the a-C:H thin film at room temperature.