Control over the crystalline state of sapphire

Saulius Juodkazis, Koichi Nishimura, Hiroaki Misawa, Takahiro Ebisui, Ryoichi Waki, Shigeki Matsuo, Tatsuya Okada

Research output: Contribution to journalArticlepeer-review

137 Citations (Scopus)


Control over the crystallanity and chemical reactivity of sapphire (Al 2O3) using femtosecond pulse exposure was investigated. Crystalline-to-amorphous and amorphous-to-polycrystalline transitions were induced inside a sapphire sample using single and multi-pulse radiation. The method allowed the fabrication of a 3D network of channels without apparent constraints on their length. Multipulse exposure of sapphire caused partial recrystallization of the amorphous phase. The results showed high selectivity of wet etching in sapphire optically amorphized by the pulses. It was also observed that the crystallinity of sapphire can be controlled with a precision of several nanometers by the appropriate choice of exposure conditions. It was demonstrated that matter can be subjected to extreme pressure by commonly available femtosecond laser radiation.

Original languageEnglish
Pages (from-to)1361-1364
Number of pages4
JournalAdvanced Materials
Issue number11
Publication statusPublished - 2006 Jun 6
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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