We experimentally and theoretically investigated the second-harmonic (SH) radiation from spherical gold nanoparticles as function of the particle radius in the range from 40 to 100 nm. By fitting the measured SH intensity to an analytical model, we demonstrated size-dependent second-order susceptibility tensor components, which significantly increase by reducing the size of the particles. Finally, we found new SH polarization diagrams for large particle radii arising from the interference among the different multipolar terms.
Size-dependent second-harmonic generation from gold nanoparticles / Capretti, Antonio; Emanuele F., Pecora; Forestiere, Carlo; Luca Dal, Negro; Miano, Giovanni. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 89:12(2014), pp. 125414-1-125414-5. [10.1103/PhysRevB.89.125414]
Size-dependent second-harmonic generation from gold nanoparticles
CAPRETTI, ANTONIO;FORESTIERE, CARLO;MIANO, GIOVANNI
2014
Abstract
We experimentally and theoretically investigated the second-harmonic (SH) radiation from spherical gold nanoparticles as function of the particle radius in the range from 40 to 100 nm. By fitting the measured SH intensity to an analytical model, we demonstrated size-dependent second-order susceptibility tensor components, which significantly increase by reducing the size of the particles. Finally, we found new SH polarization diagrams for large particle radii arising from the interference among the different multipolar terms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
