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Calculated electric-field enhancement at the plasmon resonance of a gold sphere of radius 10 nm. Field intensity is color-coded from low (black) to high (white); the central black ring is the boundary of the sphere. [Mingzhao Liu, Philippe Guyot-Sionnest, Tae-Woo Lee, and Stephen K. Gray, Phys. Rev. B 76, 235428 (2007)]

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