Abstract
Aperture-less near-field scanning optical microscopy (NSOM) is a promising spectroscopic technique for nano-scale imaging which provides high spatial resolution beyond the diffraction limit of light. Due to its advantages, aperture-less NSOM has been employed for various spectroscopic applications, for example, absorption and scattering for electron state analysis by monitoring the Rayleigh scattering efficiency; or vibrational state analysis by measuring Raman scattering from molecules. However, absorption analysis via monitoring Rayleigh scattering is not straightforward since the origin of Rayleigh scattering is a complex problem. This is because the background signal of Rayleigh scattering from the substrate and the optics cannot be distinguished from the signal coming from the sample.
© 2016 Japan Society of Applied Physics, Optical Society of America
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