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

Koo Chul Je, Honglyoul Ju, Mona Treguer, Thierry Cardinal, Seung Han Park

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16 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)7994-8000
Number of pages7
JournalOptics Express
Issue number17
Publication statusPublished - 2006 Jan 1


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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