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Bulletin of the American Physical Society

A Quantum Plasmonic Circuit for Cold Atoms

Michael J. Gullans, Darrick E. Chang, Johannes Feist, Tobias Tiecke, Jeff Thompson, J. I. Cirac, P. Zoller, Mikhail D. Lukin

Published Mar 1, 2012• 0 citations
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We report on the realization of a plasmonic dipole mirror for cold atoms based on a metallic grating coupler. A cloud of atoms is reflected by the repulsive potential generated by surface plasmon polaritons (SPPs) excited on a reflection gold grating by a 780 nm laser beam. Experimentally and numerically determined mirror efficiencies are close to 100%. The intensity of SPPs above a real grating coupler and the atomic trajectories, as well as the momentum dispersion of the atom cloud being reflected, are computed. A suggestion is given as to how the plasmonic mirror might serve as an optical atom chip.
We propose a scheme to generate one-dimensional (1D) dark hollow lattices to trap and guide cold atoms periodically at the nanometer scale by surface plasmons (SP) excited on the periodic metallic strips (arrays) with the blue-detuned light.Intensity and optical potential in the trap are calculated by Comsol method, and it shows that closed contour lines of SP intensity and optical potential can realize the effective trapping and guiding of cold atoms in our 1D lattices.Cold atoms are trapped in the region with a section diameter about 30 nm, by which the trap has a large intensity gradient (> 3 13 m W 10 ).