Abstract
A five-level X-type atomic scheme is proposed to elucidate the two-dimensional (2D) atom localization in sub-wavelength domain by using different coupling situations of the atom with standing wave fields. The scheme is a mixture of two upper V- and lower -type usual three level systems which both are connected at a common intermediate level. The combination of the upper and lower systems can lead to different atom localization patterns as lattice-, chain-, crater-, wave-, and spike-like structures. We discuss how these structures may depend on different coupling conditions of the atom with the standing wave fields. Finally, an experimental implementation for such an atomic model is presented using the 87Rb atoms.
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