Anisotropic Emission from Multi layered Plasmon Resonator Nanocomposites of Isotropic Semiconductor Quantum Dots

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Ozel T., Nizamoglu S., Sefunc M. A., Samarskaya O., Ozel I. O., Mutlugun E., ...More

ACS NANO, vol.5, no.2, pp.1328-1334, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 5 Issue: 2
  • Publication Date: 2011
  • Doi Number: 10.1021/nn1030324
  • Journal Name: ACS NANO
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1328-1334
  • Keywords: localized surface plasmons, excitons, fluorescence anisotropy, resonators, semiconductor quantum dots, layer-by-layer assembly, nanocomposites, METAL-ENHANCED FLUORESCENCE, NANOCRYSTALS, SINGLE
  • Abdullah Gül University Affiliated: No

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.