Localized and delocalized plasmons in metallic nanovoids

Abstract

Nanostructured metal films comprised of periodically arranged spherical voids are grown by electrochemical deposition through a self-assembled template. Detailed measurements of the angle-and orientation-dependent reflectivity for different sample geometries reveal the spectral dispersion of several different types of surface plasmon modes. The dependence of the energies of both delocalized Bragg and localized Mie plasmons on the void goemetry is presented, along with theoretical models to explain some of these experimental findings. Strong interactions between the different plasmon modes as well as other mixing processes are identified. Understanding such plasmonic crystals allows for the engineering of devices tailored for a wide range of sensing application.

Tunable magneto-photonic response of nickel nanostructures

“…This coupling between propagating and localized modes has also been observed in similar Au nanostructures. 19 Although the shape and sphere diameter dependence of experimental and theoretical spectra are very similar, the intensity of the experimental PKR is not as high as theoretically expected from SMM simulations (solid line in Figure 2), probably due to disorder that damps and broadens the resonances, where geometrical disorder affects the most. Disorder in these structures usually appears at long-range being less pronounced at short range.…”

Capturing Irradiation with Nanoantennae: Plasmon‐Induced Enhancement of Photoelectrolysis

“…from a laser), the surface plasmon enters an excited state resulting in a surface plasmon polariton (SPP). The latter cannot be generated on a flat surface due to a momentum mismatch between incident photons and surface plasmons present at the interface 51 . There are several ways in which this mismatch could be corrected for, one of which is using a prism for coupling, another by scattering off surface nanodefects or off diffraction gratings such as those provided by the SSV structure 49,52 .…”

Stretchable metal-elastomer nanovoids for tunable plasmons

“…1͑b͔͒. Nanovoids in solid-metal films have been investigated extensively elsewhere, 15 and support resonant plasmon modes within truncated spherical cavities which have energies and field distributions, which strongly depend on the structure geometry. Furthermore, the cavities of nanovoid structures are ideally suited to mechanical manipulation since the spherical geometry uniformly distributes the applied strain, minimizing the possibility of rupturing or tearing the cavity walls.…”

“…Comparison with angle-resolved reflectivity data ͑not shown͒ indicate that the plasmon is a 1 D Mie mode mixed with a Bragg plasmon mode. 15 The sample was stretched on a translation stage while recording the normal incidence reflectivity using a 10ϫ optical microscope collecting over a FIG. 2.…”