Ultra small clusters of gold nanoshells detected by SNOM

• Autorzy: Cricenti A. , Luce M. , Moroni D. , Salvetti O. , D’Acunto M.

Identyfikatory

DOI

10.1515/oere-2015-0010

• Konferencja: Advanced Infrared Technology and Applications - AITA 2013 (12 ; 10-13.09.2013 ; Turin, Italy)
• Języki publikacji: EN

Abstrakty

EN

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 absorption 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-infrared can be attached to cancerous cells. 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 evanescent wave conditions, with a finite-difference time-domain (FDTD) simulation and experimentally on BaTiO3-gold nanoshells using a scanning near-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.

Słowa kluczowe

EN

nanoshells; optical properties of nanoparticles; scanning near-optical microscopy (SNOM); Mie theory; FDTD simulation; biomedical applications

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2015
• Tom: Vol. 23, No. 1
• Strony: 37--43
• Opis fizyczny: Bibliogr. 23 poz., il., rys., wykr.

Twórcy

autor

Cricenti A.

• Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, ISM-CNR, via Fosso del Cavaliere, 100, I-00133, Rome, Italy

autor

Luce M.

• Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, ISM-CNR, via Fosso del Cavaliere, 100, I-00133, Rome, Italy

autor

Moroni D.

• Istituto di Scienza e Tecnologie dell’Informazione, Consiglio Nazionale delle Ricerche, ISTI-CNR, via Moruzzi, 1, I-56124, Pisa, Italy

autor

Salvetti O.

• Istituto di Scienza e Tecnologie dell’Informazione, Consiglio Nazionale delle Ricerche, ISTI-CNR, via Moruzzi, 1, I-56124, Pisa, Italy
• NanoICT laboratory, Area della Ricerca CNR, Pisa, Italy

autor

D’Acunto M.

• Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, ISM-CNR, via Fosso del Cavaliere, 100, I-00133, Rome, Italy
• Istituto di Scienza e Tecnologie dell’Informazione, Consiglio Nazionale delle Ricerche, ISTI-CNR, via Moruzzi, 1, I-56124, Pisa, Italy
• NanoICT laboratory, Area della Ricerca CNR, Pisa, Italy

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