Image of near-field second-harmonic generation for inversely poled mesoscopic LiNbO3 domains - art. no. 054104

A theoretical investigation is presented for the image of near-field second -harmonic generation (SHG) from inversely poled LiNbO3 domains. Self-consis tent integral equation formalism and Euler rotation matrix are applied to i nvestigate the optical intensity distribution of this kind of near-field SH G. The numerical simulations show that the calculated images of the near-fi eld second-harmonic wave in both transmission and collection modes of scann ing near-field optical microscopy (SNOM) at the same dip-sample distance ca n well be used to distinguish domain structures. The image patterns strongl y depend on the polarization mode and the incident angle of the illuminatio n light.