G. Blau et al., 2ND-HARMONIC GENERATION BY COUNTERPROPAGATING SURFACE-PLASMONS AT A SILVER DIFFRACTION GRATING, Optics letters, 18(16), 1993, pp. 1352-1354
We report an experimental study of second-harmonic generation at a sil
ver diffraction grating when counterpropagating surface plasmons are e
xcited with a single pump beam. In the surface plasmon minigap, no sec
ond-harmonic light is observed in the specular direction, whereas a st
rong signal is detected in the direction normal to the mean plane of t
he grating.