| The present studies concern optical properties of nanostructures, in particular, those for nanoparticles and nanowires. In our first study, we develop a theoretical formalism for the exciton-plasmon interaction for the case of CdTe nanowire with mobile excitons and Au nanoparticles with localized plasmon. In hybrid CdTe-Au nanowire-nanoparticle structure, the excitons and plasmons are coupled via the dipole-dipole interaction akin to the Forster mechanism. The exciton dynamics and the photon emission of the nanowire depend very strongly on the exciton-plasmon distance (separation distance between the nanowire and nanoparticle). We find that the photon emission of the nanowire is blue shifted for smaller separation distances. We also study the processes of exciton transfer in coupled nanoparticles and nanowires, and obtain analytical equation and numerical results for the energy transfer rates. We find that, for large distance, the energy transfer rates are inversely proportional to the fifth power of the nanowire-nanoparticle separation distance. We estimate the transfer rates for CdTe nanowire -- CdTe nanoparticle, Si nanowire -- CdTe nanoparticle, Au nanorod -- CdTe nanoparticle. In the case of Si nanowire -- CdTe nanoparticles we also study the light harvesting efficiency. Finally, we study the heat generation of photo-excited Au nanoparticles. Here, we focus on a) the heat generation of single nanoparticles embedded in a matrix (water and ice); b) the collective heat generation of an ensemble of Au nanoparticles embedded in a water droplet and in a heat-conductive medium; and c) the temperature distribution on a surface of a crystal due to heat generated by a single Au nanoparticle placed on top of such surface. |
