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

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.
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https://hal.archives-ouvertes.fr/hal-00111137
Contributor : Stéphane Toulin <>
Submitted on : Friday, November 3, 2006 - 2:53:26 PM
Last modification on : Tuesday, October 6, 2020 - 4:30:48 PM

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  • HAL Id : hal-00111137, version 1

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Koo-Chul Je, Honglyoul Ju, Mona Tréguer-Delapierre, Thierry Cardinal, Seung-Han Park. Local field-induced optical properties of Ag-coated CdS quantum dots. Optics Express, Optical Society of America - OSA Publishing, 2006, 14 (17), pp.7994-8000. ⟨hal-00111137⟩

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