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Proceedings Paper

Laser-induced expansion and ablation mechanisms of organic materials
Author(s): Yoichiroh Hosokawa; Takashi Mito; Takuji Tada; Tsuyoshi Asahi; Hiroshi M. Masuhara
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Paper Abstract

Time-resolved interferometry, surface light scattering imaging, and optical microscopic imaging have been developed and applied to amorphous and multicrystalline films upon intense pulsed excitation. Nanosecond interferometry of neat polystyrene film gives interesting expansion dynamics followed by complete recovery. Femtosecond surface light scattering imaging reveals the roughing processes of Copper phthalocyanine (CuPc) films. Femtosecond optical microscopic imaging of a single anthracene microcrystal shows dynamics of its laser-induced fracture and destruction. All the morphological behaviors have been directly measured in the time domain by these newly developed pump-probe methods. Ablation of CuPc crystalline and amorphous films show novel dependence of etch profile on excitation pulse width; fs etch depth increases stepwise with laser fluence, while ns etch depth becomes gradually deep as fluence does. The results are discussed in view of how electronic excitation energy evolves to morphological change.

Paper Details

Date Published: 25 February 2002
PDF: 7 pages
Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); doi: 10.1117/12.456806
Show Author Affiliations
Yoichiroh Hosokawa, Osaka Univ. (Japan)
Takashi Mito, Osaka Univ. (Japan)
Takuji Tada, Osaka Univ. (Japan)
Tsuyoshi Asahi, Osaka Univ. (Japan)
Hiroshi M. Masuhara, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4426:
Second International Symposium on Laser Precision Microfabrication

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