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Proceedings Paper

Localized phase separation inside glass by femtosecond laser-induced elemental migration
Author(s): Masahiro Shimizu; Kiyotaka Miura; Masaaki Sakakura; Masayuki Nishi; Yasuhiko Shimotsuma; Shingo Kanehira; Kazuyuki Hirao
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Paper Abstract

Localized phase separation was induced inside a glass, the composition of which is not immiscible, by femtosecond laser-induced compositional modification. The glass composition was changed locally from a miscible composition to an immiscible one with high-repetition femtosecond laser irradiation. The phase separation was confirmed by analyzing the composition of the irradiated area with confocal Raman spectroscopy and by observing the co-continuous structure due to phase separation with scanning electron microscopy. The compositional change seems to be related to thermomigration, which is the migration of atoms or ions by the temperature gradient, because the sharp temperature gradient is caused with a high-repetition femtosecond laser. With this method, we can obtain nanoscale co-continuous structure, which would have high surface area, on a glass surface. Moreover, we can control the morphology of the structure by heat treatment while avoiding phase separation in the entire glass because the composition of the non-modified region is not immiscible.

Paper Details

Date Published: 28 February 2011
PDF: 6 pages
Proc. SPIE 7996, Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2010, 79960Q (28 February 2011); doi: 10.1117/12.887428
Show Author Affiliations
Masahiro Shimizu, Kyoto Univ. (Japan)
Kiyotaka Miura, Kyoto Univ. (Japan)
Masaaki Sakakura, Kyoto Univ. (Japan)
Masayuki Nishi, Kyoto Univ. (Japan)
Yasuhiko Shimotsuma, Kyoto Univ. (Japan)
Shingo Kanehira, Kyoto Univ. (Japan)
Kazuyuki Hirao, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 7996:
Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2010
Vadim P. Veiko; Tigran A. Vartanyan, Editor(s)

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