We report an experimental study of second-harmonic generation at a silver diffraction grating when counterpropagating surface plasmons are excited with a single pump beam. In the surface plasmon minigap, no second-harmonic light is observed in the specular direction, whereas a strong signal is detected in the direction normal to the mean plane of the grating.
© 1993 Optical Society of America
Original Manuscript: February 8, 1993
Published: August 15, 1993
Gerd Blau, Jean Louis Coutaz, and Raymond Reinisch, "Second-harmonic generation by counterpropagating surface plasmons at a silver diffraction grating," Opt. Lett. 18, 1352-1354 (1993)