Plasmonic nanostructures have recently been shown to alter the photonic density of states and to provide opportunities to control semiconductor photophysical properties.1-4 Experimentally and theoretically,5 we investigated the effects of a range of hyperbolic metamaterial (HMM) lamellar structures consisting of metal and dielectric multilayers on the photoluminescence (PL) lifetime of several organic chromophores which emission range from UV to visible. These molecules were immersed in a polymeric matrix spin-coated on top of the HMM substrates and streak camera measurements were completed to monitor the evolution of the chromophores spontaneous emission. The ratio of the PL lifetimes of chromophores located on top of HMM nanostructures and on top of fused silica was shown to vary in a non-monotonous way. We then showed that normalized PL lifetime of the chromophore strongly depends on the HMM phase and the number of metal-dielectric pairs. To analyze systematically this behavior and fully understand the involved mechanisms, we also developed a theoretical analysis and took advantage of both invariant imbedding method and FDTD simulation as computational tools to quantitatively explain the experimental results and predict the responses, which could be observed when varying further the HMM nanostructures.
1. M. A. Noginov, et al., Opt. Lett., 2010, 35, 1863.
2. T. U. Tumkur, , et al., Appl. Phys. Lett., 2012, 100, 161103.
3. P. Shekhar, , et al., Phys. Rev. B, 2014, 90, 045313.
4. H. N. Krishnamoorthy, , et al., Science, 2012, 336, 205.
5. K. J. Lee, , et al. In preparation, 2016.