Abstract
Abstract We have grown arrays of silver nanowires in pores of anodic alumina membranes (metamaterials with hyperbolic dispersion at λ ≥ 615 nm), spin coated them with the dye-doped polymer (HITC:PMMA), and studied the rates of radiative and nonradiative relaxation as well as the concentration quenching (Förster energy transfer to acceptors). The results were compared to those obtained on top of planar Ag films and glass (control samples). The strong spatial inhomogeneity of emission kinetics recorded in different spots across the sample and strong inhibition of the concentration quenching in arrays of Ag nanowires are among the most significant findings of this study.
Highlights
Control of spontaneous emission and energy transfer are among the key functionalities of photonic materials and devices
In order to fill the gap in the knowledge of the energy transfer in nanowire-based hyperbolic metamaterials, we studied the effect of arrays of silver nanowires on the concentration quenching of HITC dye molecules and compared the results with those obtained in different metal-dielectric environments as well as available theoretical models
In the emission kinetics experiments, HITC:PMMA films, deposited on top of fabricated arrays of silver nanowires, Ag films, and glass substrates were excited at λ = 795 nm with ∼150 fs pulses of a 76 MHz modelocked Ti:sapphire laser (Mira 900 from Coherent)
Summary
Control of spontaneous emission and energy transfer are among the key functionalities of photonic materials and devices. It was shown that the same nonlocal metal-dielectric environments, which boost spontaneous emission, inhibit the energy transfer [8]. Energy transfer studies have been carried out in multiple geometries [18, 19], including lamellar stacks of metallic and dielectric layers [8, 20], ordered nanowire array morphologies ( addressed in the literature [21]) seem to be grossly overlooked. In order to fill the gap in the knowledge of the energy transfer in nanowire-based hyperbolic metamaterials, we studied the effect of arrays of silver nanowires on the concentration quenching of HITC dye molecules and compared the results with those obtained in different metal-dielectric environments as well as available theoretical models. The strong inhibition of the concentration quenching in arrays of Ag nanowires and large spatial inhomogeneity of emission kinetics recorded in different spots across the sample are among the most significant findings of this study
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