Nonlinearly coupled localized plasmon resonances: Resonant second-harmonic generation

TY - JOUR

T1 - Nonlinearly coupled localized plasmon resonances: Resonant second-harmonic generation

AU - Ginzburg, Pavel

AU - Krasavin, Alexey

AU - Sonnefraud, Yannick

AU - Murphy, Antony

AU - Pollard, Robert J.

AU - Maier, Stefan A.

AU - Zayats, Anatoly V.

PY - 2012/8/13

Y1 - 2012/8/13

N2 - The efficient resonant nonlinear coupling between localized surface plasmon modes is demonstrated in a simple and intuitive way using boundary integral formulation and utilizing second-order optical nonlinearity. The nonlinearity is derived from the hydrodynamic description of electron plasma and originates from the presence of material interfaces in the case of small metal particles. The coupling between fundamental and second-harmonic modes is shown to be symmetry selective and proportional to the spatial overlap between polarization dipole density of the second-harmonic mode and the square of the polarization charge density of the fundamental mode. Particles with high geometrical symmetry will convert a far-field illumination into dark nonradiating second-harmonic modes, such as quadrupoles. Effective second-harmonic susceptibilities are proportional to the surface-to-volume ratio of a particle, emphasizing the nanoscale enhancement of the effect.

AB - The efficient resonant nonlinear coupling between localized surface plasmon modes is demonstrated in a simple and intuitive way using boundary integral formulation and utilizing second-order optical nonlinearity. The nonlinearity is derived from the hydrodynamic description of electron plasma and originates from the presence of material interfaces in the case of small metal particles. The coupling between fundamental and second-harmonic modes is shown to be symmetry selective and proportional to the spatial overlap between polarization dipole density of the second-harmonic mode and the square of the polarization charge density of the fundamental mode. Particles with high geometrical symmetry will convert a far-field illumination into dark nonradiating second-harmonic modes, such as quadrupoles. Effective second-harmonic susceptibilities are proportional to the surface-to-volume ratio of a particle, emphasizing the nanoscale enhancement of the effect.

U2 - 10.1103/PhysRevB.86.085422

DO - 10.1103/PhysRevB.86.085422

M3 - Article

SN - 1098-0121

VL - 86

SP - -

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

IS - 8

M1 - 085422

ER -