2018 Fiscal Year Final Research Report
Realization of ultra-sensitive heterodyne scanning tunneling spectroscopy
| Project/Area Number |
16K13679
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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 |
Thin film/Surface and interfacial physical properties
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Research Collaborator |
Nakamura Junji
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 走査トンネル顕微鏡 / 超精密分光 / ヘテロダイン検出 / 光周波数コム |
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| Outline of Final Research Achievements |
An electromagnetic interference shield was installed around the scanning tunneling microscope system to realize the blocking of electromagnetic waves. The stray magnetic field was blocked by the heat treated permalloy. The signal strength of the noise level of the tunneling current at room temperature on the spectrum analyzer was achieved to be two order of magnitudes lower compared to the system prior to these improvements. We also succeeded in acquiring STM image and heterodyne detection in this environment. Furthermore, we succeeded in establishing new ultra-precision spectroscopy using frequency comb (comb) signal, frequency comb heterodyne scanning tunneling spectroscopy (FC-HSTS).
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| Free Research Field |
超精密分光
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では時間分解能と空間分解能とエネルギー分解能の極限の技術である周波数コムと走査トンネル顕微鏡を融合させた計測（周波数コムヘテロダイン走査型トンネル分光法（FC-HSTS））の原理を確立しました．これは物理，化学，生物などの様々な分野における超精密分光法として今後の新しい計測のパラダイムを築いた結果ともいえる大きな成果です．今後，本研究で構築したFC-HSTSを基にした新しい科学技術の発展が期待されます．
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