2004 Fiscal Year Final Research Report Summary
Investigation of photo-activity of glasses 〜from the electronic and vibrational structures〜
| Project/Area Number |
13305061
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
無機工業化学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
YOKO Toshinobu Kyoto University, Institute for Chemical Research, Professor, 化学研究所, 教授 (90158353)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Masahide Kyoto University, Institute for Chemical Research, Associate Professor, 化学研究所, 助教授 (20288559)
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| Project Period (FY) |
2001 – 2004
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| Keywords | glass / photonic materials / photo chemical reaction / organic-inorganic hybrid / laser fabrication / photorefractive / defect / photo-thermal effect |
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| Research Abstract |
The purpose of the present study is the investigation of photo-activity of defects in glasses from view points of electronic and vibrational structures. The photo-chemistry of Ge-related defects and photorefractivity in Ge-doped silica glasses and development of the photo-active organic-inorganic hybrid materials were carried out.
1. Photo-activity of Ge-related centers and enhanced photorefractivity in Ge-doped silica glasses
The most photo-active Ge-related center was found to be Ge^<2+> in silica glasses, which largely depends on the local structure of the Ge^<2+>-centers, whose activation energy of structural rearrangement responsible for photorefractive index change decreased with increasing the degree of freedom for the formation of illide structure (higher coordination structure). On the basis of the obtained results, highly photoactive Ge-doped silica glass thin film was deposited by CVD method, which exhibited >10^<-3> refractive index change by KrF excimer laser irradiation. Th
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e channel waveguides were directly written by laser irradiation. The waveguide Bragg grating was fabricated the direct writing technique.
2. Micro-fabrication of organosiloxane containing photo-active substitutents
Micro-structures were fabricated in organosiloxane materials through photo-polymerization. The degree of polymerization of siloxane main chain and organic side group was independently controlled by the preparation conditions. Optical propoerties of the resultant materials were designed using the wide variety of material and fabrication parameters.
3. Photo-thermal micro-fabrication of organic-inorganic hybrid materials
The micro photonic structures were fabricated in the low-melting transparent hybrid materials through photo-thermal processes using heat generated by nonradiative phonon emission of excited ions or dyes. A very low power laser source less than several mW can be used for the micro fabrication because the materials to be fabricated exhibited low-melting point less than 200℃ Less
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[Journal Article] Photochemical process of divalent germanium responsible for photorefractive index change in GeO_2-SiO_2 glasses2003
Author(s)
Sakoh, A., Takahashi, M., Yoko, T., Nishii, J., Nishiyama H., Miyamoto, I
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Journal Title
Optics Express 11(21)
Pages: 2679-2688
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Photochemical reaction of Ge^<2+> in germanosilicate glasses under intense near-UV laser excitation2002
Author(s)
Takahashi, M., Ichii, K., Tokuda, Y., Uchino, T., Nishii, J., Fujiwara, T., Yoko, T.
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Journal Title
J.Appl.Phys. 92
Pages: 3442-3446
Description
「研究成果報告書概要(欧文)」より
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