Figure 12: Optical absorption spectra of samples shown in Figures 11(a) and 11(b) named parallel-linearaligned (side-to-side-connected) and linear-aligned (end-to-end-connected) AuNRs, respectively. The concentrations of AuNRs in both samples are almost same (about 109 cm−2). The spectra include both absorption and scattering by AuNRs. Reproduced with permission from [31]. Copyright 2007 American Institute of Physics.