Angular Momentum of the Cylindrical Vector Beam

Angular momentum of the cylindrical vector beam has been investigated according to general definition of angular momentum of electromagnetic wave.It is shown that the spin angular momentum is mainly dependent on the polarization,but the orbital angular momentum are both dependent on the helical phase factor and the polarization,and the spin angular momentum and the orbital angular momentum of the non-paraxial beam are also related with the structure of the beam.It is also shown that the angular momentum could not be separated into the spin and orbital parts that are independent of each other in the case of paraxial approximation.