Abstract
When intense femtosecond laser pulses are focused into a glass substrate, self-organized periodic nanostructures, so-called nanogratings, are generated in a certain parameter regime. To clarify the ultimate structure of the nanogratings we employed focused ion beam (FIB) milling and small angle X-ray scattering (SAXS). The results considerably show that voids are the primary constituents and their number increases with ongoing exposure to laser pulses. Potential applications will be highlighted.
Highlights
About ten years ago grating like structures with periods smaller than the laser wavelength were observed inside fused silica after irradiation with tightly focused ultrashort laser pulses [1]
The results considerably show that voids are the primary constituents and their number increases with ongoing exposure to laser pulses
Emerging after several laser pulses [2] they are oriented perpendicular to the laser polarization (see Fig. 1(a))
Summary
About ten years ago grating like structures with periods smaller than the laser wavelength were observed inside fused silica after irradiation with tightly focused ultrashort laser pulses [1]. Abstract: When intense femtosecond laser pulses are focused into a glass substrate, selforganized periodic nanostructures, so-called nanogratings, are generated in a certain parameter regime. To clarify the ultimate structure of the nanogratings we employed focused ion beam (FIB) milling and small angle X-ray scattering (SAXS). The results considerably show that voids are the primary constituents and their number increases with ongoing exposure to laser pulses.
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