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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 19 — Sep. 15, 2008
  • pp: 14476–14495

Femtosecond laser nano-ablation in fixed and non-fixed cultured cells

H. Niioka, N. I. Smith, K. Fujita, Y. Inouye, and S. Kawata  »View Author Affiliations

Optics Express, Vol. 16, Issue 19, pp. 14476-14495 (2008)

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To understand the onset and morphology of femtosecond laser submicron ablation in cells and to study physical evidence of intracellular laser irradiation, we used transmission electron microscopy (TEM). The use of partial fixation before laser irradiation provides for clear images of sub-micron intracellular laser ablation, and we observed clear evidence of bubble-type physical changes induced by femtosecond laser irradiation at pulse energies as low as 0.48 nJ in the nucleus and cytoplasm. By taking ultrathin sliced sections, we reconstructed the laser affected subcellular region, and found it to be comparable to the point spread function of the laser irradiation. Laser-induced bubbles were observed to be confined by the surrounding intracellular structure, and bubbles were only observed with the use of partial pre-fixation. Without partial pre-fixation, laser irradiation of the nucleus was found to produce observable aggregation of nanoscale electron dense material, while irradiation of cytosolic regions produced swollen mitochondria but residual local physical effects were not observed. This was attributed to the rapid collapse of bubbles and/or the diffusion of any observable physical effects from the irradiation site following the laser exposure.

© 2008 Optical Society of America

OCIS Codes
(140.3440) Lasers and laser optics : Laser-induced breakdown
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7090) Ultrafast optics : Ultrafast lasers

ToC Category:
Ultrafast Optics

Original Manuscript: June 6, 2008
Revised Manuscript: August 24, 2008
Manuscript Accepted: August 25, 2008
Published: September 2, 2008

Virtual Issues
Vol. 3, Iss. 11 Virtual Journal for Biomedical Optics

H. Niioka, N. I. Smith, K. Fujita, Y. Inouye, and S. Kawata, "Femtosecond laser nano-ablation in fixed and non-fixed cultured cells," Opt. Express 16, 14476-14495 (2008)

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