Figure 4

SEM image of InAs NWs, polarized Raman spectra, and azimuthal dependence of the TO mode. (a) SEM image of InAs NWs transferred on a Si substrate. (b) Parallel polarized Raman spectra from a bulk InAs (110) and an InAs nanowire. For both measurements, the exciting and scattered light are polarized along the <111> direction. (c) A series of parallel and perpendicularly polarized Raman spectra obtained using exciting light polarized parallel and perpendicular to the nanowire axis. The spectra have been shifted vertically. (d) Azimuthal dependence of the TO mode related to the ZB structure in the nanowire. Spheres and open squares represent the parallel and perpendicular components of the Raman signal collected with respect to the nanowire axis, respectively. The continuous line is a squared sine fit to the data.