Development of tip-enhanced near-field spectroscopy with a single photon and a single molecule sensitivity

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03569
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: HAYAZAWA NORIHIKO 国立研究開発法人理化学研究所, Kim表面界面科学研究室, 専任研究員 (90392076)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 走査プローブ顕微鏡 / ナノ材料 / メゾスコピック系 / 光物性 / 表面・界面物性

Outline of Final Research Achievements

Single photon detection and single molecule sensitivity have been achieved in the 1st and 2nd year of this project, respectively. Based on the achievements, the highly sensitive detection and the highly stabilized ambient STM system were combined in the final year. I have achieved 0.6 nm spatial resolution on the monolayer Graphene on Au(111), which is the highest spatial resolution ever achieved by tip-enhanced Raman spectroscopy in ambient condition. Due to the highly confined excitation by the tip-enhancement, the selection rule for Raman spectroscopy was found to be changed, which allows for the detection of forbidden phonon modes such as D-band. D-band was found to be activated by the tip-enhancement without defects. Moreover, forbidden combination modes of D+D’ band was also activated in the same manner.
I have also applied the highly sensitive detection to UHV-LT-STM and achieved the single molecule Raman detection from Cu-Naphthalocyanine on 3layers-NaCl/Ag(111).

Free Research Field

近接場光学