Abstract

We report the enhancement of multiphoton photoelectric emission, from a thin silver film, by surface plasmons excited at the single-metal–vacuum interface. The surface plasmons are resonantly pumped by femtosecond laser pulses in the Kretchmann attenuated-total-internal-reflection configuration. A quantum yield approaching 2 × 10−8 at a photon fluence of 10 MW/cm2 from a two-photon process was observed, which is 5 × 103 higher than that of the bulk emission measured for the same film at the same power fluence.

© 1990 Optical Society of America

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