Abstract
Nanoparticles play a crucial role in biomedical and sensing applications. In this paper the design of non-spherical gold nanoparticles, operating in the near infrared and visible regime, is proposed. The structures consist of metallic resonating inclusions of different shapes embedded in a dielectric environment. Different geometries, such as cube, elliptical cylinder and rod are considered. The main purpose of this study is to develop new analytical formulas useful in the nanoparticle design for specific biomedical and sensing applications. These analytical models are developed in order to describe the electromagnetic behavior of the nanoparticles in terms of resonant wavelength position, magnitude and amplitude width for absorption and scattering cross section. The obtained results are compared to the numerical ones, performed by full-wave simulations, and to the experimental values existing in literature. A good agreement among analytical, experimental and numerical results was obtained. Then, the structure is analyzed in terms of sensitivity properties. Exploiting the proposed analytical models, it is possible to design the nanostructures with the desired electromagnetic properties. The results show that these structures can be successfully applied for sensing applications.
Highlights
In the last few years there has been a huge interest in nanostructure fabrication, due to a wide variety of potential applications offered by their use
The main purpose of this study is to develop new analytical formulas useful in the nanoparticle design for specific biomedical and sensing applications
When the nanoparticle is exposed to an electromagnetic source, the electromagnetic field response is highly localized near the nanostructure
Summary
In the last few years there has been a huge interest in nanostructure fabrication, due to a wide variety of potential applications offered by their use. Netic problem for any inclusion geometry it is necessary to understand their electromagnetic behavior and develop design formulas useful for their implementation. The possibility of predicting, by proper analytical models, the electromagnetic behavior of different kinds of structures is of considerable interest in order to build up inclusions that satisfy certain requirements. Starting from this background, this research attempts to present a design method for a selected group of nanoparticles with desired electromagnetic properties. New analytical models describing the nanoparticle electromagnetic behavior are presented. The target is to develop new analytical closed form formulas for the design of such nanostructures. The cube length l, the elliptical cylinder semiaxes a and b, the rod thickness ar and the height of the whole structures h
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