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Journal Articles

Interaction of soft X-ray laser pulse radiation with aluminum surface; Nano-meter size surface modification

Ishino, Masahiko; Faenov, A.*; Tanaka, Momoko; Hasegawa, Noboru; Nishikino, Masaharu; Tamotsu, Satoshi*; Pikuz, S.*; Inogamov, N. A.*; Zhakhovsky, V. V.*; Skobelev, I.*; et al.

AIP Conference Proceedings 1465, p.236 - 240, 2012/07

 Times Cited Count:2 Percentile:63.75

We irradiated the focusing soft X-ray laser pulses having a wavelength of 13.9 nm and the duration of 7 ps to aluminum surface. After the irradiation process, the irradiated surface was observed with a scanning electron microscope. The surface modifications caused by soft X-ray laser single pulse exposure were clearly seen. In addition, it was found that the conical structures having around 100 nm in diameters were formed in the shallow features. The nano-meter size modified surface structures on aluminum induced by the soft X-ray laser pulse is interesting as the newly surface structure. Hence, the soft X-ray laser beam would be a candidate for a tool of micromachining. We also provide a thermomechanical modeling of the soft X-ray laser interaction with aluminum briefly to explain the surface modification.

Journal Articles

Nanoscale surface modifications and formation of conical structures at aluminum surface induced by single shot exposure of soft X-ray laser pulse

Ishino, Masahiko; Faenov, A. Ya.*; Tanaka, Momoko; Hasegawa, Noboru; Nishikino, Masaharu; Tamotsu, Satoshi*; Pikuz, T. A.*; Inogamov, N. A.*; Zhakhovskii, V. V.*; Skobelev, I. Yu.*; et al.

Journal of Applied Physics, 109(1), p.013504_1 - 013504_6, 2011/01

 Times Cited Count:33 Percentile:77.1(Physics, Applied)

no abstracts in English

Oral presentation

Observations of the material surfaces irradiated with the focused soft X-ray laser pulses

Ishino, Masahiko; Faenov, A.*; Tanaka, Momoko; Hasegawa, Noboru; Nishikino, Masaharu; Tamotsu, Satoshi*; Pikuz, T. A.*; Inogamov, N. A.*; Zhakhovsky, V. V.*; Skobelev, I. Y.*; et al.

no journal, , 

no abstracts in English

Oral presentation

The Study of soft X-ray laser ablation and nano-scale surface modification of metals

Kawachi, Tetsuya; Ishino, Masahiko; Nishikino, Masaharu; Faenov, A.*; Pikuz, T.; Hasegawa, Noboru; Inogamov, N. A.*; Skobelev, I. Y.*; Fortov, V. E.*; Khohlov, V. A.*; et al.

no journal, , 

Laser ablation has many technological applications in material processing and nano-structure fabrication. The laser-induce damage of the materials has been intensively studied and its dependence upon the pulse width, the photon energy, and the fluence has come to be understood. Recently novel light sources in soft X-ray region, i.e., laser-based soft X-ray laser (SXRL) and X-FEL, become available, and the use of these light sources provide us new possibility of laser processing. SXRL interaction with materials is quite different from that of optical lasers: Dominant absorption process is photo-ionization which creates high energy photo-electrons with around 100 eV in localized surface layer of materials, and such a temperature growth increases the tensile stress which may induce the spallation of the surface layer or unexpected surface modification. In this presentation, we report an experimental and theoretical study of SXRL ablation and nano-scale surface modification of metals.

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