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Plasmonic rainbow rings induced by white radial polarization
This Letter presents a scheme to embed both angular/spectral surface plasmon resonance (SPR) in a unique far-field rainbow feature by tightly focusing (effective NA 1.45) a polychromatic radially polarized beam on an Au 20 nm∕SiO 2 500 nm∕Au 20 nm sandwich structure. Without the need for angular or spectral scanning, the virtual spectral probe snapshots a wide operation range (n 1-1.42; λ 400-700 nm) of SPR excitation in a locally nanosized region. Combined with the high-speed spectraldoi:10.1364/ol.37.001205 pmid:22466196 fatcat:3ua4gmankvcfrfczguandreneq