Fig. 7. (Color online) Histograms representing the SNR of individual GNRs detected in photothermal reflectance images for aspect ratios (AR) of (a) 3.71, (b) 3.95, (c) 4.19, and (d) 4.65. The distributions for each AR are shown in panels (a)–(d), with the mean SNR and standard deviations indicated. (e) The relationship between the aspect ratio of GNRs and the average SNR of individual GNRs in the photothermal reflectance images.
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