关键词: 金属圆柱阵列, 表面等离激元, 原子光学晶格, 衍射极限

Abstract:

In this paper, we propose a 2D optical lattice for ultra cold atom by the 2D metallic cylinder array. The light intensity distribution of Surface Plasmon with near field coupling is investigated by Comsol method. Optical potential and Van der Waals potential of cold atoms as well as the dependence of distribution of total potential and the height of center of the trap are investigated. We derive a dark hollow area with 350 nm length, 350 nm width, 60 nm height located above the middle of four metal cylinders, which can be used to trap cold atoms. Our research provides a new method for further research of periodic atomic optical device with an ability of breaking diffraction limit.

Key words: metallic cylinder array;surface plasmons;optical atomic lattice;diffraction limit