Strong coupling of metallic nanoparticles results in interaction of the plasmonic properties of individual nanoparticles and forms a new hybridized response that can be controlled through nanoparticle geometry and excitation field parameters. In this report, we show controlled excitation and enhancement of gap plasmon responses in closely spaced and differently aligned gold nanoparticles of various sizes and shapes. Our numerical results reveal that the spectral, spatial, and temporal intensities of coupled nanoparticles can be hugely enhanced by controlling the geometry, morphology, and alignment of the nanoparticles. Besides, shaping the temporal profiles of the excitation field gives an unprecedented control over the spectral and temporal responses of the gap plasmons. These findings might have implications for designing and fabrication of metallic nanoparticles for surface-based applications.

Date Published: 3 November 2016
PDF: 7 pages
Proc. SPIE 10028, Plasmonics II, 1002803 (3 November 2016); doi: 10.1117/12.2247135

Published in SPIE Proceedings Vol. 10028:
Plasmonics II
Hongxing Xu; Satoshi Kawata; David J. Bergman; Xing Zhu, Editor(s)