Angol nyelvű Tudományos Szakcikk (Folyóiratcikk)

- SJR Scopus - Atomic and Molecular Physics, and Optics: Q1

Azonosítók

- MTMT: 30912452
- DOI: 10.1088/2040-8986/ab411f
- WoS: 000487560400001

Szakterületek:

Counter-propagating co-axial Laguene-Gaussian (LG) beams are considered, not in the
familiar scenario where the focal planes coincide at z = 0, but when they are separated
by a finite axial distance d. The simplest case is where both beams are doughnut beams
which have the same linear polarisation. The total fields of this system are shown
to display novel amplitude and phase distributions and are shown to give rise to a
ring or a finite ring lattice composed of double rings and single central ring. When
the beams have slightly different frequencies the ring lattice pattern becomes a finite
set of rotating Ferris wheels and the whole pattern also moves axially between the
focal planes. We show that the fields of such an axially shifted pair of counter-propagating
LG beams generate trapping potentials due to the dipole force which can trap two-level
atoms in the components of the ring lattice. We also highlight a unique feature of
this system which involves the creation of a new longitudinal optical atom trapping
potential due to the scattering force which arises solely when d not equal 0. The
results are illustrated using realistic parameters which also confirm the importance
of the Gouy and curvature effects in determining the ring separation both radially
and axially and gives rise to the possibility of atom tunnelling between components
of the double rings.

2020-08-14 17:30