Figure 3.

Emission intensity of different gold nanorods as a function of their plasmon peak position. The data are plotted for the anti-Stokes (a) and Stokes (b) sides of the emission; the orange vertical line at 633 nm is the wavelength of the laser. The anti-Stokes intensity was obtained by integrating the emission at wavelengths shorter than the laser, while the opposite was done for the Stokes. The spread in intensities for similar peak positions can be attributed to variations in sizes and, possibly, to different quantum yields of the different individual particles. The maximum emission for the anti-Stokes is obtained when the plasmon is slightly blue shifted from the excitation laser and vice versa for the Stokes emission. To see this figure in color, go online.