Extreme Spatio-temporal Control of Near-field Spectroscopy

2014 Fiscal Year Final Research Report

• Project/Area Number: 24686009
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: The Institute of Physical and Chemical Research
• Principal Investigator: HAYAZAWA NORIHIKO 独立行政法人理化学研究所, その他部局等, 研究員 (90392076)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 走査プローブ顕微鏡 / 光物性 / 非線形 / 超短パルス / ラマン分光 / ナノチューブ / プラズモン / 近接場光学

Outline of Final Research Achievements

I developed a near-field spectroscopy towards extreme spatio-temporal control using visible~near infrared light source. For the extreme temporal resolution, I employed degenerated four wave mixing (FWM), which is one of the third order nonlinear processes. Near infrared broadband pulse is focused onto a near-field probe and I found that a broadband FWM is generated from the tip. By taking the autocorrelation of the generated pulse from the tip, it was found that the pulse has a time duration of ~10fs, which suggested that near-field time-resolved spectroscopy is possible with the nano light source. For the extreme spatial resolution, I developed a home-built scanning tunneling microscope (STM) specifically for near-field spectroscopy. By optimizing environmental condition of the STM, 1.7nm spatial resolution was achieved by STM based tip-enhanced near-field Raman spectroscopy. The achieved spatial resolution is the world highest spatial resolution in optical spectroscopy in ambient.

Free Research Field

近接場分光