2006 Fiscal Year Final Research Report Summary
Fabrication of local ordered structure in glass by laser irradiation for nano-photonic materials/devices
| Project/Area Number |
16350111
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Tohoku University (2006)
Nagaoka University of Technology (2004-2005) |
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Principal Investigator |
FUJIWARA Takumi Tohoku University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (10278393)
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| Co-Investigator(Kenkyū-buntansha) |
BENINO Yasuhiko Nagaoka University of Technology, Department of Engineering, Research Associate, 工学部, 助手 (90283035)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Nano-Crystallized Glass / Laser-Induced Crystallization / Nonlinear Photonics / Nano-Crystalline Particles / Nano-Photonic Circuits |
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| Research Abstract |
We succeeded in fabricating novel nano-crystalline particle structures on KNbO_3-TeO_2 glass induced by ultraviolet (UV) laser irradiation and found that the size and size distribution could be controlled by the conditions of laser irradiation, such as fluence, pulse repetition rate, and the temperature of the glass specimen by heat assistance (HA). Nano-sized crystalline particles are in interesting new material, because they will be able to open the door to the invention of photonic circuits of extremely small size, which transfer optical signals through optical near-field energy operating by a completely different principle. We have found two results from the experiment of UV laser irradiation with 308 nm wavelength as follows ; 1. the particle diameters are increased with increasing of the number of pulses, and then saturated up to approximately 30 J/cm^2. 2. When using HA with a glass specimen during laser irradiation, it has been found that the uniformity of particle size is mark
… More
edly improved by HA treatment. The standard deviation of particle size is improved to be approximately 1/5. These results suggested that heat is involved in nanoparticle formation during UV laser irradiation, which means that the overall history of heating with pulsed laser irradiation is critically important to control the form of the particles, in other words, to make a tuning of crystallization/nucleation behaviors in glass.
In addition, it should be noticed that nano-crystallization of rutile and anatase with 10 nm particle size was observed in CaO-B_2O_3-Bi_2O_3-Al_2O_3-TiO_2 glass systems. The color of the present crystallized glass was changed by the heat-treatment temperature, and X-ray diffraction (XRD) patterns of the crystallized glass show that the apparent color change is correlated with the formation of titania nano-crystallites. The present titania nano-crystallized glass will be not only a photocatalytic material but also a promising candidate for random lasing devices because of a large refractive index in titania. Less
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Research Products
(47 results)
