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Metallic nanoparticle shape and size effects on aluminum oxide-induced enhancement of exciton-plasmon coupling and quantum dot emission.

Authors
  • Wing, Waylin J1
  • Sadeghi, Seyed M1
  • Gutha, Rithvik R1
  • Campbell, Quinn1
  • Mao, Chuanbin2
  • 1 Department of Physics, University of Alabama in Huntsville , Huntsville, Alabama 35899, USA.
  • 2 Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma , Norman, Oklahoma 73019, USA.
Type
Published Article
Journal
Journal of Applied Physics
Publisher
AIP Publishing
Publication Date
Sep 28, 2015
Volume
118
Issue
12
Pages
124302–124302
Identifiers
PMID: 26442574
Source
Medline
License
Unknown

Abstract

We investigate the shape and size effects of gold metallic nanoparticles on the enhancement of exciton-plasmon coupling and emission of semiconductor quantum dots induced via the simultaneous impact of metal-oxide and plasmonic effects. This enhancement occurs when metallic nanoparticle arrays are separated from the quantum dots by a layered thin film consisting of a high index dielectric material (silicon) and aluminum oxide. Our results show that adding the aluminum oxide layer can increase the degree of polarization of quantum dot emission induced by metallic nanorods by nearly two times, when these nanorods have large aspect ratios. We show when the aspect ratio of these nanorods is reduced to half, the aluminum oxide loses its impact, leading to no improvement in the degree of polarization. These results suggest that a silicon/aluminum oxide layer can significantly enhance exciton-plasmon coupling when quantum dots are in the vicinity of metallic nanoantennas with high aspect ratios.

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