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- W2014018144 abstract "Microstructures of silicon induced by pulsed laser irradiation were investigated. Microstructure evolution induced by two different laser configurations (lasers with wave length of 355 nm and 532 nm) was characterized by scanning electron microscopy. The measurement results show that periodic structure and villous structure were fabricated on silicon surface by varying the intensity of the applied lasers under atmospheric conditions. Regardless of the laser configurations used, it is found that the used laser intensity plays an important role in the microstructure formation. At low laser intensity, the main character of the irradiated surface is periodic ripples and the period of ripple structure is about 400 nm. Villus structure is the main feature formed with the increase of laser intensity. The mechanism of the villus formation induced by laser irradiation was proposed. Based on the experimental results, the clusters induced by laser irradiation recombine with each other and grow under the increase of laser intensity. During irradiation, the induced plasma expanded upward from the target surface. The clusters and ions in the plume collided with each other. Besides, the collision also happened between molecules of air and the clusters originated from target. As a result of numerous collisions, neutral molecules were dissociated into polarized nanoclusters. The induced nanoclusters redeposited on the target surface. The clusters recombine with each other and adhere to protuberance on the surface. This process results in the formation of cluster-assembled villous microstructure. The optical character of the irradiated samples was measured by FT-IR spectroscopy, and the transmission spectra were analyzed." @default.
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- W2014018144 date "2010-05-13" @default.
- W2014018144 modified "2023-10-16" @default.
- W2014018144 title "Microstructure evolution and FT-IR spectra of silicon induced by pulsed laser irradiation" @default.
- W2014018144 doi "https://doi.org/10.1117/12.867938" @default.
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