Effect of the material of metal nanoparticles on local field intensification in copper phthalocyanine

For spherical Cu, Ag, and Au nanoparticles with a radius of 1–3 nm in copper phthalocyanine (CuPc), with allowance for internal size effects, we calculate the scattering efficiency factor in the near zone, the extinction efficiency factor due to scattering and absorption of incident radiation, and the efficiency of the increase in absorption by the matrix material. This occurs in the CuPc absorption bands, as well as in the weak absorption region of CuPc, where, owing to surface plasmon resonance, an additional absorption band arises for nanoparticles of all three materials. For Ag nanoparticles, the increase in absorption is twice as high as for Cu and Au nanoparticles; for these it differs inconsiderably.