Product Code: ICAL09_N104

Electrode Modifications and Characteristics of Femtosecond Laser-Stimulated Electrical Discharges in Nanoscale Gaps
Authors:
Jian Chen, Ohio State University; Columbus OH USA
Lingna He, -; -
Yong Chae Lim, The Ohio State University; Columbus OH USA
Dave Farson, The Ohio State University; Columbus OH USA
Stanislav Rokhlin, Ohio State University; Columbus OH USA
Presented at ICALEO 2009

Femtosecond (FS) laser-stimulated discharges in nanoscale and microscale gaps between etched nanoprobe tip cathodes and gold film anodes were studied by experiments and particle simulation with a goal to develop nanoscale plasma-based thermal materials processes. For appropriate values of gap length, applied potential and laser irradiance, breakdown discharges could be reliably stimulated by FS laser pulses (for 500nm gaps, discharges were observed for applied potentials as small as 20V). Minor cathode tip damage could be observed for FS laser pulses that reliably stimulated discharges, suggesting that laser ablation of the cathode played on important role in stimulation of breakdown discharges in nanoscale gaps. A particle in cell simulation was used to study the composition and density of laser ablation products necessary to stimulate breakdowns in 500nm gaps. The simulation predictions of particle species and densities necessary for breakdown were found to be comparable to experimental values.

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