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Optical Engineering

Nanosecond laser ablation of silver nanoparticle film
Author(s): Jaewon Chung; Sewoon Han; Daeho Lee; Sanghoon Ahn; Costas P. Grigoropoulos; Jooho Moon; Seung Hwan Ko
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Paper Abstract

Nanosecond laser ablation of polyvinylpyrrolidone (PVP) protected silver nanoparticle (20 nm diameter) film is studied using a frequency doubled Nd:YAG nanosecond laser (532 nm wavelength, 6 ns full width half maximum pulse width). In the sintered silver nanoparticle film, absorbed light energy conducts well through the sintered porous structure, resulting in ablation craters of a porous dome shape or crown shape depending on the irradiation fluence due to the sudden vaporization of the PVP. In the unsintered silver nanoparticle film, the ablation crater with a clean edge profile is formed and many coalesced nanoparticles of 50 to 100 nm in size are observed inside the ablation crater. These results and an order of magnitude analysis indicate that the absorbed thermal energy is confined within the nanoparticles, causing melting of nanoparticles and their coalescence to larger agglomerates, which are removed following melting and subsequent partial vaporization.

Paper Details

Date Published: 7 February 2013
PDF: 9 pages
Opt. Eng. 52(2) 024302 doi: 10.1117/1.OE.52.2.024302
Published in: Optical Engineering Volume 52, Issue 2
Show Author Affiliations
Jaewon Chung, Korea Univ. (Korea, Republic of)
Sewoon Han, Korea Univ. (Korea, Republic of)
Daeho Lee, Univ. of California, Berkeley (United States)
Sanghoon Ahn, Univ. of California, Berkeley (United States)
Costas P. Grigoropoulos, Univ. of California, Berkeley (United States)
Jooho Moon, Yonsei Univ. (Korea, Republic of)
Seung Hwan Ko, KAIST (Korea, Republic of)


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