Experimental measurement of the dispersion relations of the surface plasmon modes of metal nanoparticle chains

Abstract

The dispersion relations of the surface plasmon modes of metal nanoparticle chains are measured, and compared with theory. The theoretical model includes the effects of retardation, radiative damping and dynamic depolarization due to the finite size of the nanoparticles. The results reveal that, in addition to one longitudinal and one transverse mode, there is a third mode, which has not been previously reported.

Surface modes in plasmonic crystals induced by diffractive coupling of nanoantennas

“…2 Several studies have been carried out to investigate the interaction between nanoparticles arranged in one-dimensional ͑1D͒ and two-dimensional ͑2D͒ arrays. [3][4][5][6][7][8][9][10][11] Previous theoretical 9,10 and experimental 4,7,11 work has focused on mode propagation in 1D chains of coupled nanoparticles with a separation much smaller than the wavelength of light, or on arrays of nanoparticles on top of metallic surfaces coupled by surface-plasmon polaritons, 6 or on arrays of metallic nanostructures coupled by guided modes in dielectric waveguides. 5 In this Rapid Communication, we provide a detailed analysis of lattice surface modes on plasmonic crystals of nanoantennas.…”

Overcoming the adverse effects of substrate on the waveguiding properties of plasmonic nanoparticle chains

“…Waveguiding applications of plasmonic chains have also been considered in the literature. [12][13][14][15][16][17][18][19] The major problems one faces in the waveguiding applications are (i) engineering of useful dispersion relations (ii) coping with losses and (iii) coping with parasitic electromagnetic coupling with the environment, in particular, with the substrate. In our previous work, we have used the additional degrees of freedom that are inherent in nonspherical particles such as oblate and prolate spheroids to solve some of these problems.…”

“…Dispersion relations and transient processes (wave packet transmission) in plasmonic chains have also been studied in detail. 19,20,[27][28][29] In particular, it was found that chains of spherical particles cannot support propagation of well-formed wave packets due to the flatness of the corresponding dispersion curves. This, in particular, has motivated our interest in chains of non-spherical particles such as prolate or oblate spheroids, 20,21 which can serve as broadband SPP waveguides.…”

Substrate effects onto complex modes and optical properties of 2D arrays of linear trimers of plasmonic nanospheres

“…This fact indeed motivates the studies behind wave propagation in periodic arrays of nanoparticles. Fabricated structures are usually deposited on top of multilayered substrates of some sort, and many theoretical works have yet neglected their effects on supported waves and optical properties (e.g., [7]). Effect of substrate has been taken into account in [8] where however periodicity effects have not been included.…”