Multipole theory for tight focusing of polarized light, including radially polarized and other special cases.
A multipole expansion, based on spherical harmonics, provides an efficient method for calculating the field in the focal region of a lens for radially polarized illumination, or other illumination polarization and phase distributions, including vortex beams. The multipole approach also has the benefit of providing a simple measure of the purity of the longitudinal field mode. The method is also convenient for calculation of fields scattered by particles and calculation of optical trapping forces.
Department of Electrical and Computer Engineering, National University of Singapore, Singapore.
Thanh Xuan
TX
Hoang
Xudong
X
Chen
Colin J R
CJ
Sheppard
D004560:Electricity; D008027:Light; D008962:Models, Theoretical; D055620:Optical Phenomena