title: Tunable near-infrared optical properties of three-layered metal nanoshells.
abstract: The extinction spectra of a three-layered metal nanoshell, which consists of a particle with a dielectric core, a middle Ag (Au) layer, and an outer Au (Ag) shell, have been investigated by means of the Mie theory. With a decrease in the outer shell thickness or the middle layer thickness, the wavelengths of the localized surface plasmon resonance (LSPR) for SiO(2)-Ag-Au (SiO(2)-Au-Ag) nanoshells show distinct redshifts and the full widths at half maximum (FWHMs) for the dipole peaks in the extinction spectra decrease first and then increase. We have further investigated the influence of the embedding medium on the LSPRs for SiO(2)-Ag-Au and SiO(2)-Au-Ag nanoshells and found that the resonance wavelengths of the particles show redshift and the FWHM of the dipole peak increases with increasing the dielectric constant of the embedding medium. The calculated results indicate that the LSPR of the three-layered gold-silver nanoshells can be controlled to the near-infrared region by changing the geometry, which has practical biomedical application.
authors.affiliation: Key Laboratory of Modern Acoustics of MOE, Nanjing University, Nanjing 210093, China.
authors.forename: Dajian
authors.initials: D
authors.lastname: Wu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Xu
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Liu
mesh_terms: D000465:Algorithms; D004574:Electromagnetic Fields; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008956:Models, Chemical; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D019265:Spectroscopy, Near-Infrared; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D012834:Silver; D006046:Gold; D012822:Silicon Dioxide