2012 Fiscal Year Final Research Report
Radiation Pressure Cooling With Localized Surface Plasmon
| Project/Area Number |
23656039
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Applied optics/Quantum optical 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(Renkei-kenkyūsha) |
FUJIWARA Hideki 北海道大学, 電子科学研究所, 准教授 (10374670)
TANAKA Yoshito 北海道大学, 電子科学研究所, 博士研究員 (50533733)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 放射圧 / プラズモン局在場 / クーリング / 金属ナノ構造 |
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| Research Abstract |
We have theoretically and experimentally investigated radiation pressure induced by localized surface plasmon (LSP) of metal nano-gap structures, and analyzed the strength and spatial distribution of the optical force exerted on nanometer-sized particles and molecules under thermal motions. We showed that the nanoscale spatial profiles of the LSP fields within the nano-gap exhibit complicated fine structures, rather than single peaks. The nanopatterns are formed by interferences of dipolar, quadrupolar, and higher-order multipolar plasmonic modes. In addition, we developed the measurement system for quantitatively analyzing the radiation pressure exerted on nanoparticles. The experimental results demonstrated that the force strength is enhance by 3 order of magnitude compared to that with conventional far-filed trapping. We also succeeded in observation of two-dimensional trapping potentials, which is the first demonstration of super-resolution optical trapping.
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