Effect of the plasmon-exciton coupling on the optical response of a ZnO/Ag/ZnO nanocomposite

18th International Summer School on Vacuum, Electron and Ion Technologies

Koleva, M.E.^1 ; Nedyalkov, N.N.^1 ; Atanasov, P.A.^1

Acad. E. Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia 1784, Bulgaria^1

关键词: Exciton coupling;    Extinction efficiency;    Extinction spectra;    Nano-structured;    Nanoparticles sizes;    Optical response;    Plasmon resonances;    Spectral characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/514/1/012031/pdf
DOI  :  10.1088/1742-6596/514/1/012031

来源: IOP

【 摘 要 】

The study prsented is focused on the optical properties of ZnO/AgNPs/ZnO multilayer nanocomposites. The optical properties of the nanostructures depend on the silver layer thickness. The optical spectral characteristics of Ag nanoparticles (AgNPs) nanostructured by laser irradiation in a ZnO medium were investigated theoretically and experimentally. The extinction spectrum was determined as a function of the nanoparticles size distribution and of the surrounding medium. The extinction efficiency calculated is red-shifted and broadened when the AgNPs are introduced in a ZnO environment. This result is in agreement with the experimental measurements, where the plasmon resonance peak position of the ZnO/AgNPs/ZnO composite is red-shifted, compared to the AgNPs/ZnO sample. Raisng the thickness of the Ag layer increases the resonance extinction. We also propose a method for controlling and tuning the SPR-based sensing of Ag nanoparticles in a ZnO medium.