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In the heart of nanogratings made up during femtosecond laser irradiation

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Abstract

We observed the intimate structure of nanogratings made up by femtosecond laser irradiation. We reveal that nanoplans are meso-porous glass layers that are at the root of the strong refractive index contrast. Nanopores formation is likely due to glass decomposition.

© 2010 Optical Society of America

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