High-density regular arrays of nanometer-scale rods formed on silicon surfaces via femtosecond laser irradiation in water.
basic_science · Level V
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- Record sourced from PubMed, PMID 18540658.
- Also identified by DOI 10.1021/nl080291q.
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Abstract
We report on the formation of high-density regular arrays of nanometer-scale rods using femtosecond laser irradiation of a silicon surface immersed in water. The resulting surface exhibits both micrometer-scale and nanometer-scale structures. The micrometer-scale structure consists of spikes of 5-10 mum width, which are entirely covered by nanometer-scale rods that are roughly 50 nm wide and normal to the surface of the micrometer-scale spikes. The formation of the nanometer-scale rods involves several processes: refraction of laser light in highly excited silicon, interference of scattered and refracted light, rapid cooling in water, roughness-enhanced optical absorptance, and capillary instabilities.