Istituto di Scienza e Tecnologie dell'Informazione     
D'Acunto M., Cricenti A., Luce M., Moroni D., Salvetti O. Ultra small clusters of gold nanoshells detected by SNOM. In: Optoelectronics Review, vol. 23 (1) pp. 39 - 45. De Gruyter, 2015.
Metal nanoshells are a type of nanoparticle composed by a dielectric core and a metallic coating. These nanoparticles have stimulated interest due to their remarkable optical properties. In common with metal colloids, they show distinctive absorp‚ą' tion peaks at specific wavelengths due to surface plasmon resonance. However, unlike bare metal colloids, the wavelengths at which resonance occurs can be tuned by changing the core radius and coating thickness. One basic application of such property is in medicine, where it is hoped that nanoshells with absorption peaks in the near‚ą'infrared can be attached to can‚ą' cerous tumours. In this paper, we study the changes of optical response in visible and near infrared wavelengths from single to randomly distributed clusters of nanoshells. The results were obtained using a novel formulation of Mie theory in evanes‚ą' cent wave conditions, with a finite‚ą'difference time‚ą'domain (FDTD) simulation and experimentally on BaTiO3‚ą'gold nano‚ą' shells using a scanning near‚ą'optical microscope. The results show that the optical signal of a randomly distributed cluster of nanoshells can be supplementary tuned with respect to the case of single nanoshell depending by the geometric configuration of the clusters.
In questo lavoro si dimostra come con uno SNOM ad apertura sia possibile identificare nell cellule di topo delle nanoshells di oro che assorbono nell'infrarosso prossimo. i risultati sono particolarmente importanti per migliorare i trattamenti oncologici di ipertermia.
URL: http://www.degruyter.com/view/j/oere.2015.23.issue-1/oere-2015-0010/oere-2015-0010.xml?format=INT
DOI: 10.1515/oere-2015-0010
Subject Scanning Near-optical microscope SNOM
Gold nanoshells
FDTD simulations
Biomedical hyperthermia treatment
35Q60 PDEs in connection with optics and electromagnetic theory

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