ИСТИНА

Light emitting Si nanocrystals (Si-NCs) in solid matrices offer certain advantages for optoelectronic applications, however, generally their external quantum efficiency is limited to about few percent. One of the recent approaches to overcome this problem is based on plasmon-induced enhancement of Si-NCs emission due to their interaction with metal nanostructures. To achieve the significant enhancement an effective near-field coupling is required between Si-NCs and nearby metal nanoparticles. Thus, the effect of Si-NCs emission enhancement is of strong local nature which is defined by localized type of the plasmons involved. In turn, weaker interest is focused on utilization of delocalized (propagating) plasmons for the enhancement of Si-NCs luminescence, which might be realized by means of 1D-periodic metal structure. The present work is devoted to the investigation of resonant interaction between propagating surface plasmon polaritons (SPP), induced by light diffracted from 1D-periodic metal structure, and silicon nanocrystals in silicon dioxide matrix. In order to define the geometrical parameters of metal structure, which are suitable for resonant interaction, theoretical calculations of directional emissivity for the SiNCs were performed. Angle-resolved reflectance spectroscopy was used to determine the main parameters of light-excited SPP. Photoluminescence measurements were done to study the dependence of enhancement level on the structural parameters of the samples.