The aperture less scanning near-field optical microscopy (a-SNOM) is a promising technique to control spins using light in nano-scale, because a near-field light utilized in a-SNOM is enhanced several orders stronger than an incident light and could have a diameter of < 10 nm. However, controlling of polarization of near-field light in a-SNOM is the most important issue to be solved. In order to control the polarization of the light in the a-SNOM, we need to understand polarization properties of a-SNOM first.
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