Abstract
A hybrid optical nanostructure of plasmon-coupled SQDs was developed for photonic applications. The coupling distances between the mono-layers of Au nanoparticles with a surface concentration of ~9.18 × 10-4 nm-2 and CdSe/ZnS SQDs with that of ~3.7 × 10-3 nm-2 were controlled by PMMA plasma etching. Time-resolved spectroscopy of plasmon-coupled SQDs revealed a strong shortening of the longest lifetime and ~9-fold PL enhancement. Polarization-resolved PL spectroscopy displayed linear polarization and depolarization at near- and far-field plasmon-coupling, respectively. The physical origin of PL enhancement could be attributable to both the large local field enhancement and the fast resonant energy transfer.
Highlights
Hybrid optical materials consisting of semiconductor quantum dots (SQDs) and plasmonic metal nanoparticles are of great interest for photonic and biomedical applications [1,2,3,4]
The decay times of CdSe/ZnS between a PMMA film and a quartz substrate without plasmon coupling were analyzed into three components of τ1 ~2 ns, τ2 ~11 ns, and τ3 ~39 ns
A hybrid optical nanostructure of plasmon-coupled SQDs was prepared for photonic applications
Summary
Hybrid optical materials consisting of semiconductor quantum dots (SQDs) and plasmonic metal nanoparticles are of great interest for photonic and biomedical applications [1,2,3,4]. The internal quantum efficiency of SQDs in the proximity of plasmonic nanoparticles significantly changes when excitons and plasmons coherently interact via the Coulomb force. Large changes in the optical properties of SQDs in the proximity of plasmonic nanoparticles are anticipated to be achieved by controlling the coupling distance [9]. The plasmon-exciton coupling distance is an important component for the reduction of non-radiative and radative decay rates of excitons by their fast coupling rate It is scales the re-excitation density of the strongly localized plasmonic field to the excitons. On the basis of the time- and polarization-resolved spectroscopic results, the plasmon-exciton coupling dynamics and the origin of fluorescence enhancement are discussed
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