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Various interference pattern formations have been investigated using six countering laser beams that form a six-sided pyramid. Phase shift and amplitude variations among the interfering beams are very useful for designing interference patterns summarized here. The interference patterns are categorized into 32 unit figures, and structural changes with different thresholds are investigated in detail.

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Huge numbers of 2D-or 3D-nanostructures can be generated by interfering ultra-short pulse laser processing in a single shot. Unit structures are nanowhiskers, nanoneedle, nanobump, nanomesh of metal. The distribution of these nanostructures are according to interference pattern, which can be controlled and designed by the number of beams, correlation angle, amplitude ratio and phase shifts between the beams. In this paper, we simulated the interference pattern with different combinations of these parameters. Our technique is useful for fabrication of metamaterials, in which designed unit structures are in designed periodic patterns.