Plasmon-induced Purcell effect in InN/In metal-semiconductor nanocomposites

Abstract

The Purcell effect, acceleration of a spontaneous emission recombination rate, has been observed in InN/In nanocomposites with buried nanoparticles of metallic In. This effect, associated with localized plasmons, is characterized by the averaged Purcell factor as high as 30-40 in the structures with large enough particles. This high value is indicative of a noticeable contribution from the emitting dipoles polarized normally to the nanoparticle surface in this system. The experimental observation of shortening of the emission lifetimes with increasing the amount of In is supported by calculations performed in a semiclassical approximation

III‐nitride microcrystal cavities with quasi whispering gallery modes grown by molecular beam epitaxy

“…Such agglomerations were spontaneously formed in the reference planar layer grown at the identical technological parameters. The morphology and structural properties of this layer are similar to those in previously studied InN films which contained either spontaneously or intentionally formed In NPs . In the former studies, the excess of In content up to several percents was revealed by the EDX microanalysis.…”

Spontaneous radiation of a finite-size dipole emitter in hyperbolic media

“…Purcell effect is the enhancement of the spontaneous emission for a source placed in the resonant cavity as compared to that in vacuum [1]. The engineering of the radiative lifetime is now extensively studied in a variety of different systems including metallic particles [2][3][4][5], microcavities [6][7][8], and metamaterials [9][10][11][12][13].…”

“…We demonstrate that for the spatially distributed source the radiative rate does not diverge even for vanishing losses, but it depends strongly on the source size instead. The maximum enhancement of the Purcell factor can be roughly estimated as (λ/a) 3 , where λ is the light wavelength is vacuum, and a is the characteristic size of the source.…”

Enhancement of InN Luminescence by Introduction of Graphene Interlayer

“…In principle, the low emission efficiency caused by the low crystal quality can be circumvented by controlling energy transfer between radiating dipole and localized plasmons [5]. However, it does require careful adjustment of metal nanoparticle size to match plasmons resonance with emission peak.…”