Anisotropic Emission from Multilayered Plasmon Resonator Nanocomposites of Isotropic Semiconductor Quantum Dots
Author(s)
Date
2011-01-19Source Title
ACS Nano
Print ISSN
1936-0851
Publisher
American Chemical Society
Volume
5
Issue
2
Pages
1328 - 1334
Language
English
Type
ArticleItem Usage Stats
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Abstract
We propose and demonstrate a nanocomposite localized surface plasmon resonator
embedded into an artificial three-dimensional construction. Colloidal semiconductor quantum dots
are assembled between layers of metal nanoparticles to create a highly strong plasmon-exciton
interaction in the plasmonic cavity. In such a multilayered plasmonic resonator architecture of
isotropic CdTe quantum dots, we observed polarized light emission of 80% in the vertical
polarization with an enhancement factor of 4.4, resulting in a steady-state anisotropy value of
0.26 and reaching the highest quantum efficiency level of 30% ever reported for such CdTe quantum
dot solids. Our electromagnetic simulation results are in good agreement with the experimental
characterization data showing a significant emission enhancement in the vertical polarization, for
which their fluorescence decay lifetimes are substantially shortened by consecutive replication of our
unit cell architecture design. Such strongly plasmon-exciton coupling nanocomposites hold great
promise for future exploitation and development of quantum dot plasmonic biophotonics and
quantum dot plasmonic optoelectronics.
Keywords
Localized surface plasmonsExcitons
Fluorescence anisotropy
Resonators
Semiconductor quantum dots
Layer-by-layer assembly
Nanocomposites