2012 Fiscal Year Final Research Report
Development of sub-molecular spatial resolution spectroscopy using STM combined with light
| Project/Area Number |
22750004
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical chemistry
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| Research Institution | Tohoku University |
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Principal Investigator |
HORIMOTO Noriko 東北大学, 大学院・理学研究科, 助教 (40322672)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 分子分光 |
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| Research Abstract |
In scanning tunneling spectroscope-tip enhanced Raman spectroscopy (STM-TERS), the shape and intensity of the spectra depends on various experimental parameters. We studied the spectral dependence on the position inside the rough gold substrate, the polarization direction of the incident laser light, STM bias voltage and tunneling current. As a result, in the condition where the number of molecules illuminated by the laser light is constant, large Raman signal was obtained at the concave part of the rough gold substrate when the polarization direction of the laser was perpendicular to the concave. This means that the field enhancement becomes large when the tip is in the vicinity of the concave part of the rough substrate. In addition, it was revealed that small bias voltages are appropriate for TERS measurements since luminescence originating from gold increases and Raman signal decreases at high bias voltages.
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