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

Abstract

International audienceWe have studied numerically the propagation of surface plasmon polaritons (SPPs) in linear periodic chains of plasmonic nanoparticles of different shapes. The chains are deposited on top of a thick dielectric substrate. While in many commonly considered cases the substrate tends to suppress the SPP propagation, we have found that this adverse effect is practically absent in the case when the nanoparticles have the shape of oblate spheroids with sufficiently small aspect ratio (e.g., nanodisks) whose axis of symmetry coincides with the axis of the chain

Charge-transfer plasmons with narrow conductive molecular bridges: A quantum-classical theory

“…2, the system is metallic. The calculated effective mass value m * = −0.454 m e was calculated for the system using (14). Due to the system symmetry and the symmetry (k ⇒ −k), the total current of the free electrons and holes near E f ermi is cancelled without any AC electromagnetic field.…”

“…Since the SRF can be readily measured by different optical techniques 3 , LSPs are nowadays intensively used for the creation of nanoscale sensors for chemical and biological substances [4][5][6][7] . Moreover, the strong local electromagnetic field enhancements offered by plasmon excitation has rendered a wide use of plasmonic materials in different fields, such as high resolution imaging 8 , plasmon lasers 9 , chemical synthesis 10 , water splitting 11 , optical waveguiding [12][13][14][15] , biomedical and telecom applications 16,17 and photovoltaic cells 1,[18][19][20][21] , just to name a few. a) Electronic mail: alex99@iph.krasn.ru b) Electronic mail: spolyutov@sfu-kras.ru Gold is the most known substance for plasmonic applications due to its light absorption in the visible region.…”

In Depth Investigation of Lattice Plasmon Modes in Substrate-Supported Gratings of Metal Monomers and Dimers

“…In that model, particles are self-consistently coupled through the electric field that they scatter directly or after reflection onto the substrate, if there is one. In several studies, the couple dipole approximation has been applied to the conduction of light by linear and curved chains of particles supported on a surface. − For infinite arrays analysis, the strength of that model is to allow separating the response ot the metal particle (its polarizability), and the response of the grating. That latter one is completely included in a matrix “ S ” that solely depends on the environment, the periods and the illumination, but not on the particle’s parameters.…”

Thermal limiting effects in optical plasmonic waveguides

“…Appearance of several peaks for Q tr (λ) which are well pronounced for X and Z polarizations are explained by the coupling between these polarizations in the presence of substrate. This phenomenon is extensively studied in Refs [25,26,28]. and we do not address this effect in our work.…”