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By adjusting the laser polarization combinations, fluences and pulse numbers, we fabricated several types of two-dimensional (2D) complex nanostructures on the surface of c-cut ZnO single crystal by the interference of three femtosecond laser beams with central wavelength of 800nm, pulse duration of 50fs and pulse repetition frequency of 1kHz. The hexagonal 2D nanostructures with a period of 600nm...