Sharp focusing of partially coherent Bessel-correlated beams by a graded-index lens

Abstract

The nonparaxial focusing of partially coherent Bessel-correlated beams carrying vortices by a graded-index lens is investigated using the decomposition of the incident field into coherent modes and the quantum mechanical operator method. The influence of the coherence state and the incident beam aperture on tight focusing is analyzed. Our results show that a partially coherent Bessel-correlated beam can be focused into a spot of smaller size than coherent light.

Asymmetries Caused by Nonparaxiality and Spin–Orbit Interaction during Light Propagation in a Graded-Index Medium

“…Future research may be related to the study of asymmetric effects in the propagation of vortex pulses and partially polarized and partially coherent vortex beams in a gradedindex medium [58][59][60][61][62]. Of particular interest is the consideration of the effects of a largescale revival [34,63], the transverse spin phenomenon [64][65][66], and the optical spin Hall effect [67,68].…”