Abstract
Light irradiation with the surface plasmon frequency onto the metallic nanodimer yields a strongly enhanced and localized field called a hotspot in the nanogap region, and the system acts as a photonic cavity. The mode volume of the cavity is significantly small beyond the diffraction limit, leading to a very large Rabi splitting. In fact, a giant vacuum-field Rabi splitting was observed at the hotspot of nanodimers [1]. However, the quality factor (Q factor) of the metallic nanodimer is very low (Q~102 at most) because of the large decay of the plasmon. As a result, the spectral widths of the Rabi splitting peaks were comparable to the splitting energy, that is, the Rabi splitting was not clear.
© 2015 IEEE
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