2.4 Nanorods Link and El-Sayed looked at spherical nanoparticles, while Mackey, et al. looked at nanorods. Think about the models we have investigated. Why might there be a difference between the optical response of a spherical gold nanoparticle versus a gold nanorod? How would they be different? How would they be similar? The absorption data below were collected from samples of colloidal nanospheres and nanorods. For each data set, all of the particles had the same size and shape. 0 Why are there two peaks in some of the data sets, and only one peak in others? Why are the peaks closer together for the "medium" nanorods and farther apart for the "long" nanorods? Extrapolate. What do you think data for a very long, very thin gold nanowire might look like? Think back to our motivating application. Why might Mackey, et al. have chosen to work with gold nanorods