Fig. 3
From: Continuous-wave multiphoton photoemission from plasmonic nanostars
Polarization dependence of photoemission from individual nanostars. a Measurements from three different nanostars, along with (cos α)2n fits (see values of n as color-coded labels) that show the nonlinear intensity dependence of the emission. (The slight asymmetry of the measured lobes likely stems from a small lateral laser focus shift caused by the rotation of the half-wave plate for polarization control and a very small wedge angle of the waveplate.) b Polarization-dependent femtosecond-excited photoemission from a nanostar with multiple emitting tips
