Plasmon polaritons of metallic nanowires for controlling submicron propagation of light

Abstract

The optical resonances of individual plasmonic dimer antennas are investigated using confocal darkfield spectroscopy. Experiments on an array of antennas with varying arm lengths and interparticle gap sizes show large spectral shifts of the plasmon modes due to a combination of geometrical resonances and plasmon hybridization. The resonances of the coupled-dimer antennas are considerably broadened compared to those of single nanorods, which is attributed to a superradiant damping of the coupled antenna modes. The scattering spectra are compared with electrodynamic model calculations that demonstrate both the near-field and far-field characteristics of a half-wave antenna.

Plasmon resonances of silver nanowires with a nonregular cross section

“…The spectral response of these nonregular particles could also be used for near-field optical microscopy, 69 nonradiative optical transfer, 13,14 and for building new active optical components. 16 Although we focused the present article on individual, noninteracting particles with a nonregular shape, it should be emphasized that similar Raman enhancements can be observed in interacting, regularly shaped particles, as recently investigated in Refs.…”

“…4 -6 The enhanced local fields of plasmon resonant particles are useful for a variety of applications, including biosensors, [7][8][9] as sources for nanolithography 10 and as probes in scanning near-field optical microscopy ͑SNOM͒. 11,12 Finally, their spectral selectivity may make plasmon resonant particles a key component in future passive optical devices based on evanescent optical transport [13][14][15] or even in newly proposed active optical components. 16 In recent years, considerable progress has been made in the fabrication of metallic nanostructures in a controlled manner, including features in the 10-50 nm range.…”

Finite-element modeling of spontaneous emission of a quantum emitter at nanoscale proximity to plasmonic waveguides

“…Apart from these general drawbacks, the LDOS calculations present additional challenges for FDTD, due to difficulties in accurately transforming J * · Ē from the time to frequency domain, as explained in Koenderink et al [38][39][40] However, FEM does not have such challenges due to the more advanced discretization strategy for complex geometric structures by using a variety of elements of different shapes, and FEM is a frequency method which can handle arbitrary material dispersion. One might consider other options, i.e., the Green's dyadic function method 41 or point dipole method, 42 however, the Green's dyadic function method encounters difficulties in constructing Green's functions for complex geometries, and the point dipole model is limited to homogenous dielectric environments in which the metals are embedded. Since we want to develop a generally applicable quantitative method of modeling spontaneous emission for complex plasmonic structures, FEM is chosen as the numerical tool to attack the problem.…”

Influence of the cross section and the permittivity on the plasmon-resonance spectrum of silver nanowires

“…It is for example responsible for non-radiative energy transfer between neighboring particles [24][25][26]. The near field also produces the SERS effect when molecules are adsorbed on the particle [1,2,27].…”