Fig. 2
Size, shape, and composition tunability of the plasmon resonance of gold nanostructures, (a) tuning the LSPR frequency of the gold nanorod long-axis mode by synthetically controlling aspect ratio, (b) silica core-gold nanoshells show plasmon resonance frequency tunable from the visible to the NIR by changing the shell thickness relative to the core size, (c) increase in the plasmon scattering to absorption ratio by increase in particle volume in spherical AuNPs (Reprinted with permission from Jain et al. [3] Copyright 2008 American Chemical Society)