Nonlinear optical enhancement caused by a higher order multipole mode of metallic triangles

van der Veen, Monique A; Rosolen, Gilles; Verbiest, Thierry; Vanbel, Maarten K; Maes, Bjorn; Kolaric, Branko

doi:10.1039/c4tc02427c

Nonlinear optical enhancement caused by a higher order multipole mode of metallic triangles

Author:

van der Veen, Monique A

Rosolen, Gilles ; Verbiest, Thierry ; Vanbel, Maarten K ; Maes, Bjorn ; Kolaric, Branko

Keywords:

Science & Technology, Technology, Physical Sciences, Materials Science, Multidisciplinary, Physics, Applied, Materials Science, Physics, 0303 Macromolecular and Materials Chemistry, 0306 Physical Chemistry (incl. Structural), 0912 Materials Engineering, 3403 Macromolecular and materials chemistry, 3406 Physical chemistry, 4016 Materials engineering

Abstract:

© The Royal Society of Chemistry 2015. We describe a nonlinear optical study of gold triangles that exploits a higher order plasmonic resonance. A comprehensive nonlinear optical characterisation was performed both by second harmonic generation (SHG) and two photon fluorescence spectroscopy (2PF). We demonstrate and explain the enhancement of the coherent and incoherent nonlinear optical emission by a higher order multipolar mode of the plasmonic structure. The peculiarities of the mode shape and its influence on intensity and polarisation of the nonlinear signal are experimentally and numerically confirmed.