We have studied the effects of metallic substrates, lamellar metal-dielectric stacks and Fabry-Perot cavities on spontaneous emission and concentration quenching of luminescence of the HITC laser dye. Among the most intriguing results of this research are: (1) The long-range (~50 nm) inhibition of the concentration quenching (Förster energy transfer to quenching centers) by metallic and lamellar metal-dielectric substrates and (2) Enhancement of the spontaneous emission quantum yield with reduction of the cavity size below 100 nm.
We study the influence of metallic and dielectric films as well as lamellar multilayered stacks on the emission kinetics of Poly(methyl methacrylate) (PMMA) polymer doped with HITC dye at various concentrations. The two factors affecting the emission kinetics are the Purcell enhancement and self-quenching, which is particularly strong at high dye concentrations. Both effects are modified in different ways in the vicinity of metal/dielectric substrates) and appear to interfere with each other. The detailed account of the experimental results and analysis will be presented at the conference.
Vanadium oxide (VO2) is known to undergo a semiconductor-to-metal transition at 68°C. Therefore, it can be used as a tunable component of an active metamaterial. The lamellar metamaterial designed and studied in this work is composed of subwavelength VO2 and Au layers and is predicted to have the temperature controlled transition from the hyperbolic phase to the metallic phase. The VO2 films and VO2/Au lamellar metamaterial stacks have been fabricated and studied in the electrical conductivity as well as optical (transmission, reflection) experiments. The temperature depended changes in the absorption and transmission spectra of metamaterials and films have been observed experimentally and compared with the theory predictions.
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