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Schematic of the self-assembled nano-grating formed in the irradiated volume of the directly written structures of type II_fs. : refractive index of silica, , : local refractive indices of the nano-grating, : filling factor, : period of the nano-grating, , : width of the regions with index and , respectively.
Measure of the laser induced index change of each directly written region vs the energy after each annealing step, (left) (right) .
(a) Extraordinary index change normalized to the value measured before annealing, vs the temperature. (b) Birefringence vs the temperature.
and vs temperature rise and normalized to their initial value (before annealing).
Fabrication details of the sample.
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