One-dimensional periodic metallic structures and its dark hollow lattices by surface plasmons

摘要

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 (>_(10~(13)W/m~3)).