Local field-induced optical properties of Ag-coated CdS quantum dots
Idioma
en
Article de revue
Este ítem está publicado en
Optics Express. 2006, vol. 14, n° 17, p. 7994-8000
Optical Society of America - OSA Publishing
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
Optics
Stark effect
Absorption spectroscopy
Semiconductors
Orígen
Importado de HalCentros de investigación