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Electromagnetic Analysis of Graphene Nanoparticles Operating in the TeraHertz Band

Advances in Nanoparticles 2014年第3期3卷 72-76页

作者： Renato Iovine Richard Tarparelli lucio vegni Department of Engineering University of Roma Tre Rome Italy

In this work electromagnetic properties of a new type of graphene nanoparticles are investigated. The particles consist of graphene circular and square rings, embedded in a dielectric environment. The electromagnetic behavior in terms of resonant frequency position, magnitude and amplitude width for the absorption cross-section and the near electric field distribution are evaluated. Moreover, the influence of the geometrical parameters is also evaluated. The electromagnetic analysis is derived through proper full-wave numerical simulations. Numerical results show that the nanoparticles can be successfully used for the development of future graphene-based antennas operating in the TeraHertz Band.

关键词： Graphene Nanoparticles Nanoantennas Nano-Communications

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Nanoparticle Electromagnetic Properties for Sensing Applications

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Advances in Nanoparticles 2012年第2期1卷 9-14页

作者： Luigi La Spada Renato Iovine lucio vegni Department of Applied Electronics Roma Tre University Rome Italy

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.

关键词： Nanoparticles Analytical Models Localized Surface Plasmon Resonance Biomedical Applications

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Modified Bow-Tie Nanoparticles Operating in the Visible and Near Infrared Frequency Regime

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Advances in Nanoparticles 2013年第1期2卷 21-27页

作者： Renato Iovine Luigi La Spada lucio vegni Department of Applied Electronics “Roma Tre” University Rome Italy

In this contribution electromagnetic properties of traditional and modified bow-tie nanoparticles are investigated. The modified bow-tie particles consist of a pair of opposing metallic truncated triangles, embedded in a dielectric environment, with a rectangular dielectric hole engraved on the metallic structure. New analytical models for both structures are developed in order to describe the nanoparticles electromagnetic behavior in terms of resonant wavelength position, magnitude and amplitude width for the extinction cross-section. Analytical results are compared to the numerical values and to the experimental ones existing in literature. Good agreement among them is obtained. Then, the structures are analyzed in terms of sensitivity properties. Results reveal that the modified bow-tie structure can be applied for biomedical applications.

关键词： Bow-Tie Nanoparticles Localized Surface Plasmon Resonance Analytical Models Biomedical Applications

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Conical Nanoparticles for Blood Disease Detection

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Advances in Nanoparticles 2013年第3期2卷 259-265页

作者： Luigi La Spada Renato Iovine Richard Tarparelli lucio vegni Department of Engineering Roma Tre University Rome Italy

Metallic nanoparticles play an important role in the design of sensing platforms. In this paper, a new electromagnetic study for conical metal nanoparticles, working in the Near Infrared and Visible frequency regime, is proposed. The structures consist of inclusions, arranged in an array configuration, embedded in a dielectric environment. The aim of this work is to develop new analytical models, in order to describe the nanoparticles electromagnetic behavior in terms of extinction cross-section (absorption and scattering). The closed-form formulas link the conical nanoparticles geometrical and electromagnetic parameters to their resonant frequency properties in terms of wavelength position, magnitude and bandwidth. The proposed models are compared to the numerical results and to the experimental ones, reported in literature. Good agreement is obtained. The proposed analytical formulas represent useful tools for sensing applications. For this reason, exploiting such models a new sensing platform able to detect different blood diseases is obtained. Numerical results confirm the capability of the proposed structure to be used as a sensing platform for medical diagnostics.

关键词： Conical Nanoparticles Analytical Models Sensitivity Sensing Platform Blood Diseases

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