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VOLUME 92 | ISSUE 4 | PAGE 238
Double-resonance plasmon-driven enhancement of nonlinear optical response in a metamaterial with coated nanoparticles
A. A. Zharov, N. A. Zharova*
Institute for Physics of Microstructures RAS, 603950 Nizhny Novgorod, Russia
*Institute of Applied Physics RAS, 603950 Nizhny Novgorod, Russia

By means of a simple analytical model, we show the possibility of giant double-resonance enhancement of nonlinear cubic optical response of metamaterial containing layered (coated) nanoparticles with nonlinear dielectric core covered by metallic shell. Such nanoparticles support two surface plasmons of dipole type with different eigenfrequencies depending on volume portion of nonlinear dielectric. We demonstrate that giant enhancement of nonlinearity takes place under condition of double resonance when the fundamental frequency of light wave and its third harmonic simultaneously coincide or close to the frequencies of surface plasmons.

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