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Control over the Crystalline State of Sapphire
Author(s) -
Juodkazis S.,
Nishimura K.,
Misawa H.,
Ebisui T.,
Waki R.,
Matsuo S.,
Okada T.
Publication year - 2006
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200501837
Subject(s) - materials science , amorphous solid , crystallite , sapphire , femtosecond , high resolution transmission electron microscopy , phase (matter) , laser , optics , optoelectronics , nanotechnology , crystallography , transmission electron microscopy , organic chemistry , metallurgy , chemistry , physics
Amorphous regions in sapphire with sub‐micrometer 3D resolution have been produced at the focus of a single femtosecond laser pulse. Crystalline‐ to‐amorphous and amorphous‐to‐polycrystalline transitions (crystalline and amorphous regions are marked C and A in the HRTEM image) are induced by single‐ and multi‐pulse irradiation, respectively. The wet‐etching selectivity for the amorphous phase is significantly greater than that for the crystalline phase in aqueous HF.