| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
The strong enhancement of the electric field associated with local surface plasmon (LSP) excited on noble metal nanoparticles (NPs) plays a key role in various applications. The enhancement of the electric field is sensitive to the size and separation distance of NPs. Thus, these geometric parameters should be controlled precisely in order to utilize NPs as nano-scale optical devices. In this work, optical properties of single and assembled structures of AgNPs on Si(111) are studied using STM-LE spectroscopy. We found that the AgNP was created beneath the Ag tip by applying the negative voltage. The STM-LE spectrum of AgNP exhibits a broad peak in the visible light range. Size dependent study indicated that the peak intensity is increased with increasing the AgNP size, accompanying the shift of the peak position. Furthermore, the shape-dependent optical behavior of a single AgNP has been clarified using STM-LE, which is well reproduced by the theoretical calculation.
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