Enhanced nonlinear optical properties from individual silicon nanowires

We study second harmonic generation (SHG) from individual silicon nanowires. We show that second harmonic intensity is strongly dependent on the Mie resonances supported by the nanowire. The second harmonic polarization also has a size-dependent behavior, which is linked to different surface and bulk-like nonlinear susceptibility contributions. Silicon nanowires provide an interesting tool for nonlinear photonics applications.