Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4827296
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Funding
- Research Fellowship for Young Scientists of Japan Society for the Promotion of Science
- JSPS KAKENHI [22560720]
- Amada Foundation [AF-2012211]
- Grants-in-Aid for Scientific Research [22560720, 25420728, 24540537] Funding Source: KAKEN
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We have investigated the origin of nanostructures formed on metals by low-fluence femtosecond laser pulses. Nanoscale cracks oriented perpendicular to the incident laser polarization are induced on tungsten, molybdenum, and copper targets. The number density of the cracks increases with the number of pulses, but crack length plateaus. Electromagnetic field simulation by the finite-difference time-domain method indicates that electric field is locally enhanced along the direction perpendicular to the incident laser polarization around a nanoscale hole on the metal surface. Crack formation originates from the hole. (C) 2013 AIP Publishing LLC.
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