title: 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.
authors.forename: Koo-Chul
authors.initials: KC
authors.lastname: Je
authors.forename: Honglyoul
authors.initials: H
authors.lastname: Ju
authors.forename: Mona
authors.initials: M
authors.lastname: Treguer
authors.forename: Thierry
authors.initials: T
authors.lastname: Cardinal
authors.forename: Seung-Han
authors.initials: SH
authors.lastname: Park