NANOTUBE OPTICAL ACTIVITY
The optic axes of the different carbon nanotubes (with direction of the beams) are indicated by the arrows. For the double axes devices, the axes' plane is shown; initially, field vectors (arrows orthogonal to the axes) are polarized in this plane. The out of plane arrows indicate the rotated (for the angles α and β) field vectors of the outgoing beams. The position of the axes and the relative values of α and β depend on symmetry group of the tube.