Abstract
We report the unique growth of nanofibers in silica and borosilicate glass using femtosecond laser radiation at 8 MHz repetition rate and a pulse width of 214 fs in air at atmospheric pressure. The nanofibers are grown perpendicular to the substrate surface from the molten material in laser-drilled microvias where they intertwine and bundle up above the surface. The fibers are few tens of nanometers in thickness and up to several millimeters in length. Further, it is found that at some places nanoparticles are attached to the fiber surface along its length. Nanofiber growth is explained by the process of nanojets formed in the molten liquid due to pressure gradient induced from the laser pulses and subsequently drawn into fibers by the intense plasma pressure. The attachment of nanoparticles is due to the condensation of vapor in the plasma.
Highlights
Micro- and nanoscale photonic devices require miniaturized glass-based photonic components
We report the synthesis of weblike nanoparticles aggregate of silicon and metallic materials using MHz frequency femtosecond laser radiation under ambient condition [5] and is explained by the theory of vapor condensation
We aim to study the unique growth of nanofibers of silica and borosilicate glass using femtosecond laser radiation at MHz repetition rate under ambient condition, which is defined by rather a different mechanism
Summary
Micro- and nanoscale photonic devices require miniaturized glass-based photonic components. The material reaches extreme temperature and pressure and cools down in a very short time. Previous investigations on femtosecond laser nanostructuring of materials showed the formation of silicon nanotips [7], nanobumps in thin gold films [8], thin rims in borosilicate glass [9, 10] and nanofibers in chalcogenide glass [11] using femtosecond laser radiation with kHz repetition rate, the growth of glass nanofibers at MHz repetition rate under ambient condition has not been reported. We aim to study the unique growth of nanofibers of silica and borosilicate glass using femtosecond laser radiation at MHz repetition rate under ambient condition, which is defined by rather a different mechanism.
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