  Although photon spin-orbit interaction (SOI) has been extensively studied,
the vortex-conversion efficiency and the enhancement of spin Hall effect in
abnormal modes in SOI remain to be investigated. Using an one-dimensional (1D)
photonic crystal (PhC) system with the anisotropic defect layer(ADL), we
firstly find that the generation efficiency of the vortex beam is close to 50\%
when the number of periodic layers of the PhC reaches 5. Secondly, We also
discussed the case where linearly polarized light is obliquely incident on a
defect state system, and find that the destructive interference between the
normal mode and the abnormal mode reaches the maximum, resulting in the
enhancement of the spin hall displacement, and the effect can be enhanced at
any angle of incidence in this system. Finally, we found that in the defect
mode, the mutual conversion of normal and abnormal mode spins can be regulated,
and the conversion efficiency can be close to 100\%.
