Raman mapping. The GaAs peak position around a defective microtube (cone) acquired with 514.5 nm laser line. (a) Optical micrograph surrounded by the dashed line where the Raman images (b) and (c) shown in the figure were taken. In (b), the Raman image shows the peak position of the GaAs LO phonon mode. (c) Raman image of the TO mode intensity of GaAs.
Rodriguez et al. Nanoscale Research Letters 2012 7:594 doi:10.1186/1556-276X-7-594