Periodic surface structures on crystalline silicon created by 532 nm picosecond Nd : YAG laser pulses
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Creation of laser-induced morphology features, particularly laser-induced periodic surface structures (LIPSS), by a 532 nm picosecond Nd:YAG laser on crystalline silicon is reported. The LIPSS, often termed ripples,. were produced at average laser irradiation fluences of 0.7, 1.6, and 7.9 J cm(-2). Two types of ripples were registered: micro-ripples (at micrometer scale) in the form of straight parallel lines extending over the entire irradiated spot, and nano-ripples (at nanometer scale), apparently concentric, registered only at the rim of the spot, with the periodicity dependent on laser fluence. There are indications that the parallel ripples are a consequence of the partial periodicity contained in the diffraction modulated laser beam, and the nano-ripples are very likely frozen capillary waves. The damage threshold fluence, was estimated at 0.6 J cm(-2). (c) 2007 Elsevier B.V. All rights reserved.