Single-shot front-side nanoscale femtosecond laser ablation of a thin silver film

Nano- and microscale holes, as well as related sub-ablative nanospikes and sub-micron bumps, were produced in a 30-nm thick silver film on a silica substrate by single femtosecond laser pulses with variable pulse energies, focused by different strong focusing optics. Characteristic laser energy depo...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2014-11, Vol.117 (3), p.981-985
Main Authors: Danilov, P. A., Drozdova, E. A., Ionin, A. A., Kudryashov, S. I., Odinokov, S. B., Rudenko, A. A., Yurovskikh, V. I., Zayarny, D. A.
Format: Article
Language:English
Subjects:
Boiling
Characterization and Evaluation of Materials
Condensed Matter Physics
Deposition
Femtosecond
Focusing
Invited Paper
Lasers
Machines
Manufacturing
Nanostructure
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Silver
Surfaces and Interfaces
Thick films
Thin Films
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Summary:Nano- and microscale holes, as well as related sub-ablative nanospikes and sub-micron bumps, were produced in a 30-nm thick silver film on a silica substrate by single femtosecond laser pulses with variable pulse energies, focused by different strong focusing optics. Characteristic laser energy deposition dimensions exceed the expected focal spots by nearly 2 microns, indicating the considerable lateral thermal transport in the film, while the effective hole formation thresholds decrease versus increasing numerical aperture of focusing optics. Morphologies of the sub-ablative solidified surface nanostructures and numerical estimates of deposited volume energy density undermine blowing-off the molten film due to subsurface boiling and near-critical phase explosion at lower and higher sub-threshold fluences, respectively.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-014-8741-4