Surface-plasmon enhanced nonlinear photoelectric emission from thin silver films

We report a 10{sup 4} enhancement and quantum yield of 1.7 {times} 10{sup {minus}8} obtained from a 2--photon photoelectric emission of a thin silver film using surface plasmon excitation, which are resonantly pumped by femtosecond laser pulses in an attenuated-total-internal reflection configuration. 5 refs., 3 figs.