The effect of surface roughness on the plasmonic response of individual sub-micron gold spheres.
Nanoscale surface corrugation strongly determines the plasmonic response of gold nanoparticles with dimensions of several tens of nanometres. Scattering spectra of individual spheres with a rough surface were found to red-shift and broaden. The plasmon modes exhibited quadrupole damping, in contrast to particles with smooth surfaces. Additionally, rougher spheres display a higher SERS activity, which demonstrates the crucial role of nanoscale surface texturing on the plasmonic response of gold particles.
Rodríguez-Fernández
Jessica
J
Departamento de Química Física and Unidad Asociada CSIC-Universidade de Vigo, 36310 Vigo, Spain. jesica@uvigo.es
Funston
Alison M
AM
Pérez-Juste
Jorge
J
Alvarez-Puebla
Ramón A
RA
Liz-Marzán
Luis M
LM
Mulvaney
Paul
P