Comparison of second harmonic generation from cross-polarized double-resonant metasurfaces on single crystals of Au

Abstract Second harmonic generation (SHG) from metasurfaces consisting of square array split ring, heptagon and triangle cross-polarized double resonant resonators, is investigated both experimentally numerically. The structures are fabricated on single crystalline Au plates using Focused Ion Beam technique. Array the triangular structure exhibits most efficient SHG. Experimental observation explained reasonably well by theoretical evaluation SHG overlapping integral nonlinear polarization microscopic field distribution metal surface at frequency taking phase relation between two fields into account.