Laser-induced expansion and ablation mechanisms of organic materials

Yoichiroh Hosokawa; Takashi Mito; Takuji Tada; Tsuyoshi Asahi; Hiroshi M. Masuhara

doi:10.1117/12.456806

25 February 2002 Laser-induced expansion and ablation mechanisms of organic materials

Yoichiroh Hosokawa, Takashi Mito, Takuji Tada, Tsuyoshi Asahi, Hiroshi M. Masuhara

Proceedings Volume 4426, Second International Symposium on Laser Precision Microfabrication; (2002) https://doi.org/10.1117/12.456806
Event: Second International Symposium on Laser Precision Micromachining, 2001, Singapore, Singapore

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.

Citation Download Citation

Yoichiroh Hosokawa, Takashi Mito, Takuji Tada, Tsuyoshi Asahi, and Hiroshi M. Masuhara "Laser-induced expansion and ablation mechanisms of organic materials", Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); https://doi.org/10.1117/12.456806

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