Optical second harmonic intensity images of a silver grating surface

摘要

We have obtained optical second harmonic (SH) intensity images of a silver grating surface. A stripe pattern was seen in the SH intensity image when the incident light polarization is perpendicular to the lines of the grooves of the grating. We have found that the strongest SH radiation comes from the bottoms of the grooves. On the other hand, the strong linear reflection comes from the slope of the grooves. We suggest that the enhancement of the electric field at the bottoms of the grooves has led to the observed strong SH radiation.