In the Heart of Femtosecond Laser Induced Nanogratings: From Porous Nanoplanes to Form Birefringence


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.

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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.

Conflicts of Interest

The authors declare no conflicts of interest.


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