Journal
OPTICS LETTERS
Volume 36, Issue 2, Pages 229-231Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.000229
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- German National Science Foundation (DFG) [SPP 1327]
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Large-area high-spatial-frequency patterns (HSFLs) of lambda/6 periodicity have been generated by a nanojoule-femtosecond laser scanning technique (80 MHz, 170 fs, 700-950 nm) at the silicon-air interface. The excellent large-area uniformity allowed reproducible and accurate measurements of the periodicity. Variation of experimental parameters as illumination geometry, and pulse energy and number showed no influence on the ripple spacing. A wavelength dependence was observed and compared to current models of HSFL formation. A particular second-armonic model was found to match the results best but needs to take into account transient changes in the refractive index under laser exposure. A second-harmonic mechanism is further supported by direct spectroscopic observation. (C) 2011 Optical Society of America
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