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Fabrication of complex nanostructures on ZnO crystals by the interference of three femtosecond laser beams
Authors:Kan Zhou  Pingxin XiongXin Jia  Shian ZhangDonghai Feng  Tianqing Jia  Jiansheng LiuZhizhan Xu
Institution:a State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, PR China
b State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, PR China
Abstract: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 800 nm, pulse duration of 50 fs and pulse repetition frequency of 1 kHz. The hexagonal 2D nanostructures with a period of 600 nm are very regular and uniform, in which nanoparticles, nanorings and nanoripples with sizes of 200 nm are embedded. Excited by 800 nm femtosecond laser pulses, the photoluminescence (PL) micrographs reveal that the 2D nanostructures can emit purer and brighter blue light compared with the plane surface. These nanostructures have potential applications in blue light-emitting diodes (LEDs), high density optical storage and other optoelectronic devices.
Keywords:Femtosecond laser  Three-beam interference  Complex nanostructures  Photoluminescence
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