| Project/Area Number |
16350040
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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 |
Analytical chemistry
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| Research Institution | Chiba University |
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Principal Investigator |
FUJINAMI Masanori Chiba University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50311436)
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| Co-Investigator(Kenkyū-buntansha) |
OGUMA Koichi Chiba University, Faculty of Engineering, Professor, 工学部, 教授 (60009529)
池添 泰弘 東京大学, 大学院・新領域創成科学研究科, 助手 (70334315)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,700,000 (Direct Cost: ¥15,700,000)
Fiscal Year 2005: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 2004: ¥10,400,000 (Direct Cost: ¥10,400,000)
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| Keywords | Femtosecond pulse laser / Ablation / Surface plasmon resonance / Near-field optical microscope / Field enhancement / Nano area / Metal tip |
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| Research Abstract |
Much attention has been paid to micro or nano plasma induced by the femtosecond pulse laser. Because of the non-thermal effect and the nonlinear process using it, it is promising to attain the space resolution beyond the diffraction limit. The aim of this study is to establish the method of a nano-size ablation using an enhancement of electromagnetic field generated at the apex of the metallic tip and develop the analytical techniques for nano-area. Another aim is to develop the analytical method for the nano-area at the solid and liquid interface.
Scanning near-field optical microscope was installed to carry out the nano-size ablation. The electropolished Au tip was approached to the Al surface with shear-force feedback and placed within 10nm distance. Femtosecond laser with wavelength of 775nm and intensity of 13mJ/cm^2 was irradiated to the apex of the Au tip. The trench structure with 60nm wide and 11nm deep has been observed along the tip movement, indicating that the resolution beyond the diffraction limit is attained for laser ablation. The simultaneous measurement of emission under the femtosecond laser irradiation was carried out, and no emission spectra were observed. Some problems have been considered and the experimental solution for them is now in progress.
The controllable approach of the metallic tip to the surface in liquid has been invented and apertureless near field scanning optical microscopy has been developed. The tuning fork with a metallic tip is covered with a small glass tube and sealed to avoid a leak of air. Even under liquid conditions, the resonance frequency has slightly shifted and the change of Q factor is within 5%. Using local electric field enhancement at the apex of Au tip, an enhancement of Raman scattering has been observed.
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