A study was made of paraxial beam propagation parallel to the screw axis of a dislocated amorphous medium that was optically weakly inhomogeneous and isotropic. The effect of the screw dislocation on the beam's orbital angular momentum was shown to change the optical vortex strength, rendering vortex annihilation or generation possible. Furthermore, the dislocation was shown to induce a weak biaxial anisotropy in the medium due to the elasto-optic effect, which changes the beam's spin angular momentum as well as causing precession of the polarization. The equations of motion of the beam were derived and the optical Hall effect in the dislocated medium was demonstrated. Its application with regard to determining the Burgers vector as well as the elasto-optic coefficients of the medium was explained.

Paraxial Propagation in Amorphous Optical Media with Screw Dislocation. L.Mashhadi, M.Mehrafarin: Journal of Optics, 2010, 12[3], 035703