title: Extending dark optical trapping geometries.
abstract: New counterpropagating geometries are presented for localizing ultracold atoms in the dark regions created by the interference of Laguerre-Gaussian laser beams. In particular dark helices, an "optical revolver," axial lattices of rings, and axial lattices of ring lattices of rings are considered and a realistic scheme for achieving phase stability is explored. The dark nature of these traps will enable their use as versatile tools for low-decoherence atom interferometry with zero differential light shifts.
authors: Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, UK. aidan.arnold@strath.ac.uk
authors: Aidan S
authors: AS
authors: Arnold