2015 Fiscal Year Annual Research Report
Plasmonic nanostructures realizing miniaturized infrared spectrometric image-array-sensor for endoscopy
| Project/Area Number |
26289013
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| Research Institution | The University of Tokyo |
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Principal Investigator |
J・J Delaunay 東京大学, 工学(系)研究科(研究院), 准教授 (80376516)
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| Co-Investigator(Kenkyū-buntansha) |
三田 吉郎 東京大学, 工学(系)研究科(研究院), 准教授 (40323472)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | ナノマイクロ加工 / メタマテラル・表面プラズモン |
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| Outline of Annual Research Achievements |
We design and fabricate a miniaturized infrared spectrometric image-array-sensor using a new plasmonic nanostructure. The miniaturized image-array-sensor is used in biological research and medical diagnosis, particularly in endoscopy to discriminate between normal and diseased tissues. The new plasmonic nanostructure consists of periodic high-aspect-ratio semiconducting walls sandwiched between metallic layers. This structure sustains sharp, strong and controllable resonances that realize both dispersion and detection of infrared light, thus is amenable to miniaturization. We will characterize the proposed plasmonic structures for: 1) absorption resonance sharpness and strength, 2) Control of the resonance wavelength, and 3) Thermal detection responsivity.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We have designed, fabricated and characterized a plasmonic photocapacitor. The results were summarized and submitted in a leading journal NANOLETTERS (IF=13). Prof Halas, the leading researcher in the field of plasmonics, served as the editor for the referee process, and our manuscript was very recently accepted. Publication in NANOLETTERS is a remarkable achievement. The spectral selectivity and sensitivity of the photocapacitor were demonstrated for the visible and near infrared range. In the infrared region, the sensitivity is still low, but was characterized. Detection technique should be improved and the useful range of wavelengths should be extended to larger wavelengths.
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| Strategy for Future Research Activity |
In the third year, effort will be made to improve the detection technique using a technique based on a resonant RLC circuit in combination with a lock-in amplification. This should improve the detection limit of the plasmonic photocapacitor. Also, the useful rage of wavelengths should be extended to larger wavelengths. This point is difficult as it involves a change in the material of the photocapacitor, so that the complete fabrication process needs to be optimized for the new materials.
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| Causes of Carryover |
Part of travel expenses was not requested to save money. Electrical characterization was done using a borrowed equipment.
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| Expenditure Plan for Carryover Budget |
In the final year of the project, the fund will be used to cover the sample fabrication cost at the Takeda center, to maintain our simulation tools, to improve the optical setup and to build an electrical setup. Particularly, we need to improve our optical setup and buy a new CCD detector for our spectrometer.
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