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

Dongfeng Qi; Dongwoo Paeng; Junyeob Yeo; Eunpa Kim; Letian Wang; Songyan Chen; Costas P. Grigoropoulos

doi:10.1063/1.4952597

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

Dongfeng Qi, Dongwoo Paeng, Junyeob Yeo, Eunpa Kim, Letian Wang, Songyan Chen, Costas P. Grigoropoulos

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

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.

Original language	English
Article number	211602
Journal	Applied Physics Letters
Volume	108
Issue number	21
DOIs	https://doi.org/10.1063/1.4952597
State	Published - 23 May 2016

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

abstract = "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.",

author = "Dongfeng Qi and Dongwoo Paeng and Junyeob Yeo and Eunpa Kim and Letian Wang and Songyan Chen and Grigoropoulos, {Costas P.}",

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T1 - Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

AU - Qi, Dongfeng

AU - Paeng, Dongwoo

AU - Yeo, Junyeob

AU - Kim, Eunpa

AU - Wang, Letian

AU - Chen, Songyan

AU - Grigoropoulos, Costas P.

PY - 2016/5/23

Y1 - 2016/5/23

N2 - 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.

AB - 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.

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

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