Figure 1: Acousto-plasmonics in a hybrid gold–cobalt multilayer structure.
From: Femtosecond nonlinear ultrasonics in gold probed with ultrashort surface plasmons
(a) Schematic drawing of the acousto-plasmonic pump-probe experiment: surface plasmons propagating at the gold–air interface probe the reflection of acoustic pulses generated in the laser-heated cobalt transducer. (b) Measured acousto-plasmonic pump-probe interferogram showing a pronounced shift of the interference fringes upon reflection of an ultrashort acoustic pulse. The inset illustrates the geometry of the plasmonic slit-groove interferometer (see 12,13,14 for details). (c) Ultrafast dynamics of the real (red line) and imaginary (blue line) parts of the surface dielectric function extracted from the plasmonic interferogram. Panels a and b are adapted from 13.
