Absorption of hybrid fibre modes by Cs atoms in quadrupole transitions

TL;DR

This paper investigates how cesium atoms absorb hybrid fiber modes via electric quadrupole transitions, showing the absorption depends on the atom's position relative to the fiber and can be significantly enhanced near the fiber surface.

Contribution

It provides a quantitative analysis of quadrupole transition absorption rates of Cs atoms near nanofibers, highlighting the spatial dependence and potential for strong atom-field interactions.

Findings

Absorption decreases with increasing radial distance from the fiber axis.

Near the fiber surface, absorption can be two orders of magnitude larger than the quadrupole de-excitation rate.

Absorption formally vanishes at large radial distances.

Abstract

We evaluate the rate of the absorption of an optical nanofiber mode by a Cs atom in an electric quadrupole transition. With the Cs atom localized near the outer surface of the optical nano-fiber, an interaction occurs between the atomic quadrupole tensor components and the gradients of the vector components of the electric field of a hybrid fiber mode. The absorption rate is evaluated as a function of the radial position of the atom from the fiber axis, assuming a specific value of the laser power and we use experimentally accessible parameters. We find that the absorption of the hybrid modes by the Cs atom decreases as the atom recedes away from the fiber axis and formally vanishes at sufficiently large radial distances. Close to the fiber, however, the absorption rate for the input power chosen can be two orders of magnitude larger than the quadrupole de-excitation rate despite the moderate power used.