We report on a new technique of silicon surface nanostructuring in liquid with a pair of Gaussian-shaped femtosecond laser pulses. The bubble, generated in liquid near the molten silicon surface by the first pulse, serves as a dynamic microscale obstacle for spatial modulation of the intensity profile of the second pulse following at a certain delay via scattering processes. As a result, the circular ripple patterns with anomalously high surface-relief modulation, undersurface annular nanocavities, and interfacial smoothness are produced at the surface. The possibility of the control over the specific pattern through the laser intensity variation is shown.
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| http://dx.doi.org/10.1364/OL.385672 | DOI Listing |
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Article Synopsis
- The way electrons are shot out from a source depends a lot on how the laser is shaped when it hits the material.
- Using a special mask to shape the laser can be tricky because it can't perfectly recreate the sharp edges we want.
- This study found that the way the laser travels through small openings can create uneven patterns, and while these patterns usually don't change the overall statistics, they might still cause problems for machines that use these electron bunches.
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