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Diffractive chains of plasmonic nanolenses: combining near-field focusing and collective enhancement mechanisms

E. Almpanis, N. Papanikolaou, B. Auguié, C. Tserkezis, and N. Stefanou

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Abstract

We study, by means of full-electrodynamic calculations using the layer-multiple-scattering method, the effect of diffractive coupling on the enhancement of the local electromagnetic field in periodic arrays of nanolenses consisting of three silver spheres with progressively decreasing sizes and separations. The interaction between the hot-spot modes of an isolated nanolens with the Rayleigh–Wood anomalies of the periodic lattice leads to a further enhancement of the local field intensity, which can be controlled by an appropriate choice of the geometrical parameters involved.

© 2012 Optical Society of America

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