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OpticalCamouflageResume

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M
Marvin Grossi

This document discusses using metamaterials and plasmonic materials for optical camouflage and transparency of spherical nanoparticles. It conducted bibliographic research on using Drude's model for permittivity and Mie Theory for optical invisibility. Numerical simulations analyzed the electric field inside and outside particles under different geometric and electromagnetic configurations to obtain low and high observability. Figure 1 shows the electric field intensity inside a particle and its coat is considerably higher than the outside field, validating the effectiveness of the optical camouflage method described in the study.

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OPTICAL CAMOUFLAGE AND TRANSPARENCY WITH METAMATERIALS Marvin Castro Grossi, Prof. Dr. Leonardo André Ambrosio University of São Paulo, São Carlos, SP marvin.grossi@usp.br Objective Metamaterial and plasmonic materials have attracted great attention of the scientific community due to their several applications. In this study, concepts are explained and some theoretical analysis are performed, with subsequent application to optical camouflage (cloaking) of spherical nanoparticles. Optical invisibility of particles is aimed. Materials and Methods Bibliographical research was developed based on available articles at the literature (scientific magazines and technical books) in order to promote the enlargement of the sources and the deepening on the subject. In addition, analysis, deductions and documentation were performed using the collected sources, focused mainly on Drude’s model for permittivity and on the Mie Theory, seeking optical camouflage. To validate the theory, numerical simulations and analysis of the electric field were done for several cases. Results The results rely on several particular geometric and electromagnetic configurations, analyzing the electric field inside and outside the particle to be cloaked. Many conjunctures of material parameters were utilized, obtaining low and high observability. Figure 1: Electric field intensity inside the particle and at the coat, plus the scattered field after being exposed to an electromagnetic plane wave. Conclusions From Figure 1 it is clear that the electric field inside the metamaterial cover is considerably higher than the corresponding outside field. Knowing that the observability of an object is directly connected to the scattering of the incident field [1], and that the external field has a multiplicative factor of 15 for better visualization, the effectiveness of the method of optical camouflage and the theory described at this study is validated. References [1] Andrea Alù e Nader Engheta. Achieving transparency with plasmonic and metamaterial coatings. Physical Review E, Volume 72, Issue 1, Article 16623, July 2005.

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OpticalCamouflageResume

  • 1. OPTICAL CAMOUFLAGE AND TRANSPARENCY WITH METAMATERIALS Marvin Castro Grossi, Prof. Dr. Leonardo André Ambrosio University of São Paulo, São Carlos, SP marvin.grossi@usp.br Objective Metamaterial and plasmonic materials have attracted great attention of the scientific community due to their several applications. In this study, concepts are explained and some theoretical analysis are performed, with subsequent application to optical camouflage (cloaking) of spherical nanoparticles. Optical invisibility of particles is aimed. Materials and Methods Bibliographical research was developed based on available articles at the literature (scientific magazines and technical books) in order to promote the enlargement of the sources and the deepening on the subject. In addition, analysis, deductions and documentation were performed using the collected sources, focused mainly on Drude’s model for permittivity and on the Mie Theory, seeking optical camouflage. To validate the theory, numerical simulations and analysis of the electric field were done for several cases. Results The results rely on several particular geometric and electromagnetic configurations, analyzing the electric field inside and outside the particle to be cloaked. Many conjunctures of material parameters were utilized, obtaining low and high observability. Figure 1: Electric field intensity inside the particle and at the coat, plus the scattered field after being exposed to an electromagnetic plane wave. Conclusions From Figure 1 it is clear that the electric field inside the metamaterial cover is considerably higher than the corresponding outside field. Knowing that the observability of an object is directly connected to the scattering of the incident field [1], and that the external field has a multiplicative factor of 15 for better visualization, the effectiveness of the method of optical camouflage and the theory described at this study is validated. References [1] Andrea Alù e Nader Engheta. Achieving transparency with plasmonic and metamaterial coatings. Physical Review E, Volume 72, Issue 1, Article 16623, July 2005.