WJNSE  Vol.5 No.4 , December 2015
In the Heart of Femtosecond Laser Induced Nanogratings: From Porous Nanoplanes to Form Birefringence
ABSTRACT
It is demonstrated that the form birefringence related to the so-called nanogratings is quantitatively correlated to the porosity-filling factor of these nanostructures. We reveal that matters surrounding the nanopores exhibit significant refractive index decrease which is likely due to the fictive temperature increase and/or the presence of a significant amount of interstitial O2. The control of the porosity was achieved by adjusting the laser pulse energy and the number of pulses/micron i.e. the overlapping rate. Applications can be numerous in fast material processing by the production of nanoporous matter, and photonics by changing the optical properties.

Cite this paper
Desmarchelier, R. , Poumellec, B. , Brisset, F. , Mazerat, S. and Lancry, M. (2015) In the Heart of Femtosecond Laser Induced Nanogratings: From Porous Nanoplanes to Form Birefringence. World Journal of Nano Science and Engineering, 5, 115-125. doi: 10.4236/wjnse.2015.54014.
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