  Recently it has been shown that the quadrupole interactions can be improved
significantly as the atom interacts at near resonance with the
Laguerre-Gaussian (LG) mode. In this paper, we illustrate that other kinds of
optical vortex can be also led to a considerable enhancement of quadrupole
interaction when the atom interacts with optical modes at near resonance. The
calculations are performed on an interesting situation with Cs atom, where the
process is concerned with dipole-forbidden and quadrupole-allowed transitions
with a convenable choice of atomic and optical mode parameters. In this
direction, we show that the quadrupole transitions can be significantly
enhanced and therefore they can play an interesting role and lead to new
features of atom-light interaction, which can have some constructive
implications in experiments.
