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We have demonstrated a new mechanism for modulating light with light bycontrolling the efficiency with which light is coupled into a plasmon polaritonwave. An optical fluence of 15 mJ/cm^2 in the control channel is sufficient toachieve nearly a 10-fold intensity modulation of the signal beam reflected froma Glass/MgF_2/Ga structure. The mechanism depends on a nanoscale light-inducedstructural transformation in the gallium layer and has transient switchingtimes of the order of a few tens of nanoseconds. It offers high modulationcontrast for signals in the visible and near infrared spectral ranges.Comment: RevTex 4, 3 pages, 4 figure

High-contrast modulation of light with light by control of surface plasmon polariton wave coupling