Coupling strength of complex plasmonic structures in the multiple dipole approximation

Abstract

Abstract:We present a simple model to calculate the spatial dependence of the interaction strength between two plasmonic objects. Our approach is based on a multiple dipole approximation and utilizes the current distributions at the resonances in single objects. To obtain the interaction strength, we compute the potential energy of discrete weighted dipoles associated with the current distributions of the plasmonic modes in the scattered fields of their mutual partners. We investigate in detail coupled stacked plasmonic wires, stereometamaterials and plasmon-induced transparency materials. Our calculation scheme includes retardation and can be carried out in seconds on a standard PC.

Microcavity plasmonics: strong coupling of photonic cavities and plasmons

“…For more accurate calculations of structures with sizes approaching the particle distance, like in the case of near‐field coupled nanorods, the dipole model can be expanded to a series of dipoles representing the currents in a nanostructure of a certain shape. With an appropriate oscillator strength distribution function of the dipoles, good agreement with experimental measurements can be achieved . Despite its deficiencies, the dipole model provides a simple picture to intuitively understand the coupling mechanisms of nanostructures.…”

Optical activity and coupling in twisted dimer meta-atoms

“…16 Including retardation effects in the calculation of the interaction constants allows the phase shift between coupled elements to be correctly predicted. 18,19 We will show here that by including retardation effects in the self energy terms, both the near and far-field spectra can be quantitatively reproduced.…”

Optical properties of two-dimensional magnetoelectric point scattering lattices

“…Besides tailoring of and μ, the scattering properties of the subwavelength building blocks that were developed for metamaterials have attracted much attention. [5][6][7][8][9][10][11][12][13] Tailoring of the optical scattering properties may be achieved by structural design of the scatterers to control their electric and magnetic dipole polarizability, as well as by tuning their mutual optical coupling by changing their relative coordination and orientation. With recent advances in nanotechnological fabrication techniques, based on these principles, novel metasurfaces 14,15 have been demonstrated, as well as compact and on-chip compatible optical antennas, 16,17 waveguides, 18 flat lenses, 19,20 and materials with giant birefringence.…”