| 研究実績の概要 |
To maintain high stability of scanning probe microscope in room temperature, a compact and rigid SPM system based on a scanning tunneling microscope (STM) was designed and constructed. The new optics for illumination and detection were based on a fiber coupled system, which is useful for easy alignment. Beam splitters with varying reflectance and transmittance ratios were used to increase detection sensitivity. Through this environment control chamber, 3 kinds of environments in room temperature are possible: (1) ambient air, (2) nitrogen purged, and (3) low-vacuum (~10 Pa). With this multi-environment system, it will be easier to study samples that are sensitive to the local environment.
The unexpected result of this work is attaining subnanometer resolution of 0.6 nm using the developed environment controlled SPM system while conducting Raman experiments to test the detection efficiency of the system. From this result, it can also be assumed that the same high resolution that was observed for the electric field can also be observed when probing the magnetic field. Such high resolution is beneficial in studying nanosized metamaterial structures, especially at the edges of the structures where light tends to concentrate itself and generates hot spots.
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