Maximizing Nonlinear Optical Conversion in Plasmonic Nanoparticles through Ideal Absorption of Light

摘要: The optimization of nonlinear optical processes in plasmonic structures is important for the design efficient nanosources light. Considering simple case spherical nanoparticles, we clearly identify most channel second-harmonic generation, thanks to physical insights provided by generalized Mie theory. This corresponds excitation electric dipolar modes at fundamental wavelength and a quadrupolar emission. Interestingly, it demonstrated that generation intensity directly related square absorbed power, which reproduces both field enhancement specific size dependence small-particle limit. Additionally, power can be optimized controlling nanoparticle size. These results demonstrate not sufficient reaching highest conversion ...