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We propose a new approach for field enhancement by using plasmonic slow light (PSL), which is one of the phenomena unique to surface plasmon polariton (SPP). PSL shows a remarkably low group velocity and high field confinements beyond the diffraction limit. This phenomenon induces “longitudinal compression” of optical energy in nanoscale regions, resulting in a large field enhancement. The longitudinal compression by PSL opens a new dimension for field enhancement by SPP propagation. This approach will be applied to various prospective applications based on field enhancement in nanoplasmonics.
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Miyata et al. (2012) studied this question.
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