Revealing Plasmonic Gap Modes in Particle-on-Film Systems Using Dark-Field Spectroscopy

D. Y. Lei; A. I. Fernandez-Dominguez; Y. Sonnefraud; K. Appavoo; R. F. Haglund Jr.; J. B. Pendry; S. A. Maier

META 2021, META'12

D. Y. Lei, A. I. Fernandez-Dominguez, Y. Sonnefraud, K. Appavoo, R. F. Haglund Jr., J. B. Pendry, S. A. Maier

Last modified: 2018-02-28

Abstract

Polarization-controlled excitation of plasmonic modes in nanometric Au particle-on-film gaps is investigated experimentally using single-particle dark-field spectroscopy. Two distinct geometries are explored: nanospheres on top of and inserted in a thin gold film. Numerical simulations are performed to reveal the physical origin of the observed scattering peaks measured from individual nanospheres in these two configurations.

Keywords

Plasmonic Gap Modes; Particle-Film Systems; Dark-Field Nanospectroscopy