| Project Area | Strong Photons-Molecules Coupling Fields for Chemical Reactions |
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| Project/Area Number |
19049002
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
SASAKI Keiji 北海道大学, 電子科学研究所, 教授 (00183822)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIWARA Hideki 北海道大学, 電子科学研究所, 准教授 (10374670)
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| Project Period (FY) |
2007 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥74,500,000 (Direct Cost: ¥74,500,000)
Fiscal Year 2010: ¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 2009: ¥20,000,000 (Direct Cost: ¥20,000,000)
Fiscal Year 2008: ¥21,800,000 (Direct Cost: ¥21,800,000)
Fiscal Year 2007: ¥20,900,000 (Direct Cost: ¥20,900,000)
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| Keywords | 微小共振器 / 顕微分光イメージング / 金属ナノ構造体 / 光局在 / 光反応増強 / 微小球共振器 |
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| Research Abstract |
In this research project, we were aiming to realize the ultimate strong photon-molecule coupling fields, in which one photon and one molecule are interacted with perfect (100%) efficiency. This coupling field is based on the combination of spatial photon-localization (optical antenna effect) in plasmonic nanostructures and temporal photon-confinement (group-velocity reduction effect) in optical micro-cavities. For this purpose, we have investigated (a) a technique for the efficient localized plasmon excitation using a fiber-coupled microspherrical cavity system and (b) a spatially resolved mapping of localized fields using a scattering-type near-field microscope. In the study of efficient plasmon field excitation using a microcavity system, we have succeeded to suggest the possibility that about 93% incident light could couple to a gold coated AFM tip via a tapered fiber coupled microspherical cavity system at the critical condition, which was achieved by changing the distances between a taper, a microsphere, and a gold-coated AFM tip. Furthermore, we constructed a scattering-type near-field optical microscope in order to directly measure localized plasmonic fields in metal nanostructures with high spatial resolution beyond the diffraction limit. By using a scattering-type near field microscope, we measured metal nanostructures with nanogap, which were fabricated by e-beam lithography / lift-off techniques. From the results, we confirmed that the intense scattering light was observed at the nanogap of the structure and the intensity distribution showed that the width of this intensity spot was 9.2±0.5 nm, which was ～1/100 of the incident laser wavelength. Because these experimental results were in good agreement with those of numerical predictions, we succeeded to directly visualize the localized fields induced in metal nanostructures.
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