Figure 3

Raman spectra of InAs NWs measured with different average diameter and theoretical prediction. (a) Raman spectra from InAs NWs with average diameters from 35 nm (red), 42 nm (black), and 70 nm (blue). The lighter colored (green) lines are results from a multiple Lorentzian fit. The vertical line is a guide to the eye. The position of SO phonon down shifts with the decrease in diameter; (b) Dependence of the position of the SO phonon from the diameter of the NWs. The points represent experimental data obtained from several measured samples with different average diameters. The line corresponds to the theoretical prediction for cylindrical InAs NWs.