Open AccessExcitation enhancement in electric multipole transitions near a nanoedge
Author(s) -
Kosuke Shibata,
Satoshi Tojo,
Daniel Bloch
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.009476
Subject(s) - multipole expansion , excitation , atomic physics , electric field , physics , photon , atom (system on chip) , field (mathematics) , optics , quantum mechanics , mathematics , computer science , pure mathematics , embedded system
We investigate enhancement of electric multipole excitations of atoms in the vicinity of an object with a nanoscale edge resulted from a large electromagnetic field gradient. We calculate the excitation efficiencies of a Rb atom around a nanoedge and find the excitations are enhanced by several orders of magnitude. The efficiencies with the change in the magnetic quantum number resolved are also examined. Each resolved efficiency shows rotationally symmetric spatial distribution, with continuous modification in shape from the far field to the near field. Furthermore, we estimate photon emission rates accompanied with multipole excitations in alkali (Rb and Cs) atoms and discuss the possibility to observe the enhancement in the multi-pole excitation in cold atoms.