Mario Zapata-Herrera, Jefferson Flórez, Angela Camacho
In this work, we propose to describe the behavior of the optical response of small metal nanoparticles (particles below 10 nm of radius) as a function of size. We use classical models as well as quantum approaches to study the nanoparticles dielectric function in the whole range of nanometers using two infinite confinements, cubic and spherical, which are simple enough to obtain information of the quantum size effects on the optical response, measured on the enhancement field factor and absorption spectra, to find the limit of pure classical models at the nano-scale finding out enhancement factors of the order of $10^3$ for small silver nanoparticles. We confirm the plasmon resonance frequency through the absorption spectra, besides that, we have studied the role played by Localized Surface Plasmon Resonance (LSPR) in small metal nanoparticles as a function of the particle size and the environment, which are in good agreement with reported experiments and have found a limit of the classical behavior of small nanoparticles.
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http://arxiv.org/abs/1307.1815
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