Topic
Transformation optics
About: Transformation optics is a research topic. Over the lifetime, 2687 publications have been published within this topic receiving 102378 citations.
Papers published on a yearly basis
Papers
More filters
Posted Content•
TL;DR: In this article, a transfer matrix method was used to model each layer as a metasurface with effective surface electric and magnetic susceptibility derived through a thin-film approximation, which can be used to construct multilayered metamaterials to realize certain functionalities.
Abstract: We analyze single and multilayered metamaterials by modeling each layer as a metasurface with effective surface electric and magnetic susceptibility derived through a thin film approximation. Employing a transfer matrix method, these metasurfaces can be assembled into multilayered metamaterials to realize certain functionalities. We demonstrate numerically that this approach provides an alternative interpretation of metamaterial-based perfect absorption, showing that the underlying mechanism is a modified Fabry-Perot resonance. This method provides a general approach applicable for decoupled or weakly coupled multilayered metamaterials.
11 citations
TL;DR: In this paper, a cloaking system based on a layered photonic crystal (PC) structure is proposed, which acts as an effective shield in the reflection bandgap, leaving the transmission band available for communication with the outside.
Abstract: Invisibility cloaks designed by transformation optics include a perfect shield, which exclude electromagnetic fields from the cloaked region. Due to the shield, observers inside the cloak cannot see the outside. We propose a cloak that permits communication with the outside, based on a layered photonic crystal (PC) structure. The PC acts as an effective shield in the reflection bandgap, leaving the transmission band available for communication with the outside. A procedure to design an infinitely long cylindrical cloak consisting of concentric layers of dielectric and metal is given. For the proposed structure, the performance of cloaking in the reflection band and of communication in the transmission band is computed.
11 citations
TL;DR: Fiber-coupled magnetic metamaterials integrated on the transverse cross-section of an optical fiber may provide fundamentally new solutions for photonic-on-a-chip systems for sensing, subwavelength imaging, image processing, and biomedical applications.
Abstract: To date, magnetic and negative-index metamaterials at optical frequencies were realized on bulk substrates in the form of thin films with thicknesses on the order of, or less than, optical wavelengths. In this work, we design and experimentally demonstrate, for the first time, fiber-coupled magnetic metamaterials integrated on the transverse cross-section of an optical fiber. Such fiber-metamaterials integration may provide fundamentally new solutions for photonic-on-a-chip systems for sensing, subwavelength imaging, image processing, and biomedical applications.
11 citations
01 Dec 2009
TL;DR: In this article, a Taylor series expansion was used to derive simplified material parameters for two-dimensional cylindrical cloaks with improved scattering width performance when compared to previous published results.
Abstract: : Transformation optics has shown the ability to cloak an object from incident electromagnetic radiation is possible. However, the material parameters are inhomogeneous, anisotropic, and, in some instances, singular at various locations. In order for a cloak to be practically realized, simplified parameter sets are required. However, the simplified parameters result in a degradation in the cloaking function. Constitutive parameters for simplified two-dimensional cylindrical cloaks have been developed with two material property constraints. It was initially believed satisfying these two constraints would result in the simplified cylindrical cloaks having the same wave equation as an ideal cloak. Because of this error, the simplified cloaks were not perfect. No analysis was done to determine all material parameter constraints to enable a perfect two-dimensional cylindrical cloak. This research developed a third constraint on the material parameters. It was shown as the material parameters better satisfy this new equation, a two-dimensional cylindrical cloak's hidden region is better shielded from incident radiation. Additionally, a novel way to derive simplified material parameters for two-dimensional cylindrical cloaks was developed. A Taylor series expansion dictated by the new constraint equation leads to simplified cloaks with significantly improved scattering width performances when compared to previous published results. During the course of this research, it was noted all cloak simulations are performed using finite element method (FEM) based numerical methods. A Green's function was used to accurately calculate scattering widths from a two-dimensional cylindrical cloak with a perfect electrically conducting inner shell.
11 citations
TL;DR: In this article, the authors apply a rigorous eigenmode analysis to study the electromagnetic properties of linear and weakly nonlinear metamaterials and show that the nonlinear response can be totally described by the linear eigenmodes when weak nonlinearities are attributed to metammaterials.
Abstract: We apply a rigorous eigenmode analysis to study the electromagnetic properties of linear and weakly nonlinear metamaterials. The nonlinear response can be totally described by the linear eigenmodes when weak nonlinearities are attributed to metamaterials. We use this theory to interpret intrinsic second-harmonic spectroscopy on metallic metamaterials. Our study indicates that metamaterial eigenmodes play a critical role in optimizing a nonlinear metamaterial response to the extent that a poorly optimized modal pattern overwhelms the widely recognized benefits of plasmonic resonant field enhancements.
11 citations