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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 17 — Aug. 21, 2006
  • pp: 7994–8000

Local field-induced optical properties of Ag-coated CdS quantum dots

Koo-Chul Je, Honglyoul Ju, Mona Treguer, Thierry Cardinal, and Seung-Han Park  »View Author Affiliations


Optics Express, Vol. 14, Issue 17, pp. 7994-8000 (2006)
http://dx.doi.org/10.1364/OE.14.007994


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Abstract

Local field-induced optical properties of Ag-coated CdS quantum dot structures are investigated. We experimentally observe a clear exciton peak due to the quantum confinement effect in uncoated CdS quantum dots, and surface plasmon resonance and red-shifted exciton peak in Ag-coated CdS composite quantum dot structures. We have calculated the Stark shift of the exciton peak as a function of the local field for different silver thicknesses and various sizes of quantum dots based on the effective-mass Hamiltonian using the numerical-matrix-diagonalization method. Our theoretical calculations strongly indicate that the exciton peak is red-shifted in the metal-semiconductor composite quantum dots due to a strong local field, i.e., the quantum confined Stark effect.

© 2006 Optical Society of America

OCIS Codes
(260.6580) Physical optics : Stark effect
(300.1030) Spectroscopy : Absorption
(300.6470) Spectroscopy : Spectroscopy, semiconductors

ToC Category:
Spectroscopy

History
Original Manuscript: April 20, 2006
Revised Manuscript: July 25, 2006
Manuscript Accepted: July 30, 2006
Published: August 21, 2006

Citation
Koo-Chul Je, Honglyoul Ju, Mona Treguer, Thierry Cardinal, and Seung-Han Park, "Local field-induced optical properties of Ag-coated CdS quantum dots," Opt. Express 14, 7994-8000 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-17-7994


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