2012 Fiscal Year Final Research Report
Amorphous structures on metal thin film with a surface of periodicself-organized nanostructures induced by femtosecond laser processing
| Project/Area Number |
22560720
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SAKABE Shuji 京都大学, 化学研究所, 教授 (50153903)
TOKITA Shigeki 京都大学, 化学研究所, 助教 (20456825)
OGAWA Tetsuya 京都大学, 化学研究所, 助教 (40224109)
NEMOTO Takashi 京都大学, 化学研究所, 助教 (20293946)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 結晶・組成制御 / ナノ周期構造 |
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| Research Abstract |
The precise measurement for crystaldegree was performed on cupper thin film with transmission electron microscope. We have analyzed the electron diffraction patterns in the laser fluence of 0.08 -0.64 J/cm2where the grating structure is formed on thin films. It is found that the crystal structures are transformed depending on laser fluence; polycrystalline structures at <0.2 J/cm2, amorphous at ~ 0.23 J/cm2, and polycrystalline structures again at > 0.35 J/cm2. The mechanism of crystal structure transformation by femtosecond laser pulses is conceptually proposed, that is induced by the injection of energetic ions generated in the process of self-formation of periodic structures.
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