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Indian Journal of Physics

, Volume 93, Issue 12, pp 1619–1624 | Cite as

Ablation of silicon and ultrathin fibers using single femtosecond pulse

  • Mehra S. SidhuEmail author
  • Kamal P. Singh
Original Paper
  • 80 Downloads

Abstract

We exploit the nonlinear multiphoton interaction of a few-cycle femtosecond (fs) pulse with viscoelastic microfibers in order to produce nanoscale grooves on its surface. The single fs pulse has been extracted from 1 kHz pulse train by double-shutter gating technique by placing two mechanical shutters in the beamline and simultaneously triggering them with a controlled delay. With adjustment of the time delay between two shutters, a small transmission window has been created to cleanly extract a single or desired number of pulses. We found that the single-pulse ablation threshold for microfiber is \(1 \hbox { J}/\hbox {cm }^2\) while for absorbing surfaces like crystalline Si is \(0.01 \hbox { J}/\hbox {cm}^2\). Precise diffraction unlimited ablation of materials opens a route to process nanoscale waveguides, microfluidic devices to isolate cells or macro-molecules.

Keywords

Ultrafast lasers Silicon Silk Femtosecond laser 

PACS Nos.

07.60.j Optical instruments and equipment 42.65.Re Ultrafast processes; optical pulse generation and pulse compression 06.60.Jn High-speed techniques (microsecond to femtosecond) 

Notes

Acknowledgements

We thanks I. Singh for SEM images of crystalline silicon surface and central SEM facility for imaging silk. We acknowledge DST and Max Planck Society for financial support.

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Copyright information

© Indian Association for the Cultivation of Science 2019

Authors and Affiliations

  1. 1.Department of Physical SciencesIndian Institute of Science Education and Research MohaliManauliIndia

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