Ti:sapphire femtosecond laser direct micro-cutting and profiling of graphene

Abstract

This paper reports the formation of uniform single layer micro-patterns of graphene on a glass substrate using direct femtosecond laser cutting. The cutting of graphene was achieved in air and argon. By translating the graphene sample with respect to the laser beam, continuous micro-channels were carved. The cutting geometry can be controlled by varying the laser fluence and the scanning path. Also, 1∼2 μm wide graphene micro-ribbons were hatched out. The ablation threshold of graphene was determined to be 0.16∼0.21 J/cm 2 . With the laser fluence higher than the ablation threshold, graphene was ablated rapidly and removed completely without damaging the glass substrate. Atomic force microscopy (AFM) and Raman spectroscopy have been used to confirm the ablation of graphene. Time domain finite difference modelling was employed to understand the thermal history of the laser ablation process.

Laser ablation- and plasma etching-based patterning of graphene on silicon-on-insulator waveguides

“…From this graph, the ablation threshold was determined to be 0.076 J/cm 2 . This ablation threshold is higher than the value found by Zhang et al [21], but we also worked at a longer wavelength, namely 1030 nm versus 800 nm. This seems to be in line with earlier wavelength dependence studies [22].…”

Femtosecond laser fabrication of micro and nano-disks in single layer graphene using vortex Bessel beams

“…These results are in good agreement with previously reported single-shot ablation thresholds ranging from 150 À 210 mJ cm À2 for slightly different types of graphene samples and pulse durations. 13,14,25 Interestingly, as the number of laser shots N is increased, we observe a drastic reduction of the ablation threshold arising from a cumulative effect in graphene ablation process 14 also suggesting a saturation-like behavior of the ablation threshold observed for a high number of exposures (i.e., N > 100). We emphasize that, with the single-shot J 8 beam configuration presented in Fig.…”

Patterned graphene ablation and two-photon functionalization by picosecond laser pulses in ambient conditions

“…G peak should be broader and 2D would be eliminated for graphene oxide. Such defects do not lead to material degradation, 22 as G and 2D bands hold almost the same intensity-so all the bonds are preserved. Only low difference in phase (mechanical properties) is observed in AFM in the area of defect zones (Fig.…”