Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

Journal Article · Mon May 23 04:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4952597· OSTI ID:22590689

Qi, Dongfeng ^[1]; Paeng, Dongwoo; Yeo, Junyeob; Kim, Eunpa; Wang, Letian; Chen, Songyan ^[2]

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1. Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720-1740 (United States)
2. Semiconductor Photonics Research Center, Department of Physics, Xiamen University, Xiamen 361005 (China)

Nanosecond pulsed laser dewetting and ablation of thin silver films is investigated by time-resolved imaging. Laser pulses of 532 nm wavelength and 5 ns temporal width are irradiated on silver films of different thicknesses (50 nm, 80 nm, and 350 nm). Below the ablation threshold, it is observed that the dewetting process does not conclude until 630 ns after the laser irradiation for all samples, forming droplet-like particles in the spot central region. At higher laser intensities, ablative material removal occurs in the spot center. Cylindrical rims are formed in the peripheral dewetting zone due to the solidification of transported matter at about 700 ns following the laser pulse exposure. In addition to these features, droplet fingers are superposed upon irradiation of 350-nm thick silver films with higher intensity.

• OSTI ID: 22590689
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 21 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABLATION
DROPLETS
FILMS
IRRADIATION
LASER RADIATION
LASERS
PULSES
RESONANCE IONIZATION MASS SPECTROSCOPY
SILVER
SOLIDIFICATION
THICKNESS
TIME RESOLUTION
WAVELENGTHS
ZONES