Abstract
We evaluate the rate of the absorption of an optical nanofibre mode by a Cs atom in an electric quadrupole transition. With the Cs atom localised near the outer surface of the optical nano-fibre, an interaction occurs between the atomic quadrupole tensor components and the gradients of the vector components of the electric field of a hybrid fibre mode. The absorption rate is evaluated as a function of the radial position of the atom from the fibre 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 fibre axis and it formally vanishes at sufficiently large radial distances. Close to the fibre, 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.
| Original language | English |
|---|---|
| Article number | 215002 |
| Number of pages | 13 |
| Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |
| Volume | 56 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 17 Oct 2023 |
Bibliographical note
Funding Information:The authors are grateful to Professors Stephen Barnett, Sile Nic Chormaic, and Fam Le Kien for useful correspondence.
Publisher Copyright:
© 2023 The Author(s). Published by IOP Publishing Ltd.
Keywords
- absorption rate
- optical fibre modes
- quadrupole interaction