Abstract

We report the observation of coherent backscattering of optical second-harmonic generation that is due to excitation of the long-range surface plasmon mode at a silver–quartz interface. A peak-to-background ratio of greater than 2 is seen, which is possible for a coherent scattering process in nonlinear optics. The backscattering pattern has an angular half-width of 15 mrad in the incident plane but 90 mrad in the transverse plane. This effect is consistent with simple wave-vector considerations. Backscattering is observed only over a limited range of silver film thicknesses that correspond to a maximum propagation length for the surface mode.

© 1992 Optical Society of America

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