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Transformation optics

About: Transformation optics is a research topic. Over the lifetime, 2687 publications have been published within this topic receiving 102378 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors describe the challenges and opportunities for creating magnetically active metamaterials in the optical part of the spectrum and describe several theoretical techniques used for calculating the effective parameters of plasmonic metammaterials: the effective dielectric permittivity eff(!) and magnetic permeability µeff(!).

55 citations

Journal ArticleDOI
TL;DR: An analytic model is developed that explains HIT by coherent coupling between the hybridized local fields of the metamaterial and the dielectric or an atomic system in general.
Abstract: We report hybridization induced transparency (HIT) in a composite medium consisting of a metamaterial and a dielectric. We develop an analytic model that explains HIT by coherent coupling between the hybridized local fields of the metamaterial and the dielectric or an atomic system in general. In a proof-of-principle experiment, we evidence HIT in a split ring resonator metamaterial that is coupled to α-lactose monohydrate. Both, the analytic model and numerical calculations confirm and explain the experimental observations. HIT can be considered as a hybrid analogue to electromagnetically induced transparency (EIT) and plasmon-induced transparency (PIT).

55 citations

Journal ArticleDOI
TL;DR: This work proposes an extension to arbitrary orientations of the principal axes of anisotropy and oblique incidence of the anisotropic effective slabs to determine the effective permeability and permittivity of metamaterials.
Abstract: Electromagnetic or acoustic metamaterials can be described in terms of equivalent effective, in general anisotropic, media and several techniques exist to determine the effective permeability and permittivity (or effective mass density and bulk modulus in the context of acoustics). Among these techniques, retrieval methods use the measured reflection and transmission coefficients (or scattering coefficients) for waves incident on a metamaterial slab containing few unit cells. Until now, anisotropic effective slabs have been considered in the literature but they are limited to the case where one of the axes of anisotropy is aligned with the slab interface. We propose an extension to arbitrary orientations of the principal axes of anisotropy and oblique incidence. The retrieval method is illustrated in the electromagnetic case for layered media, and in the acoustic case for array of tilted elliptical particles.

55 citations

Journal ArticleDOI
TL;DR: A simple and efficient numerical approach based on unusual inverse transformation is proposed here to quickly solve partial differential equations and construct the mapping relationship and showed that a transformed optical device could be made by purely using isotropic dielectric materials.
Abstract: Integration of transformation optics with development of metamaterials offers great opportunities to create exotic material with electromagnetic functionality absent from nature. It has already led to several significant advancements in physical conceptions and technological applications such as invisible cloaking. Unfortunately practical application is often restricted by the complex requirements on material properties imposed by the general optical transformation theory. It is therefore necessary to relax the stringent requirements of materials properties in order to practicably use the power of transformation optics to design exotic optical devices. Development of new coordinate transformation mathematics to compromise between the stringent materials properties and the ultimate performance required by a useful novel device is required. In this work the authors employed strict conformal transformation to design physical materials that could guide light in a predetermined way. A simple and efficient numerical approach based on unusual inverse transformation is proposed here to quickly solve partial differential equations and construct the mapping relationship. The results showed that a transformed optical device could be made by purely using isotropic dielectric materials. Two application examples were numerically proposed to verify the versatility of conformal transformation and the robustness of the inverse approach. One was a 90 degrees waveguide beam bend, and the other was a waveguide-type beam splitter or coupler.

55 citations

01 Jan 2011
TL;DR: In this paper, a multi-coated near cloaking structure was proposed to make any target look like a disc with homogeneous physical parameters. But it was not shown that the cloaking effect significantly enhances the invisibility cloaking effects for conductivity and the Helmholtz equations.
Abstract: The goal of this paper is to illustrate the efficiency and the stability of the near-cloaking structures proposed in [4] and [5]. These new structures are, before using transformation optics, layered structures and are designed so that their first contracted generalized polarization tensors (in the quasi-static limit) or scattering coefficients (in the case of the Helmholtz equation) vanish. Inside the cloaking region, any target has near-zero boundary or scattering cross section measurements. We numerically show that this new construction significantly enhances the invisibility cloaking effect for the conductivity and the Helmholtz equations and is quite robust with respect to random fluctuations of the material parameters around their theoretical values. We finally extend our multi-coated construction to the enhanced reshaping problem. We show how to make any target look like a disc with homogeneous physical parameters. AMS subject classifications. 35R30, 35B30

55 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202324
202269
202147
202070
2019100
201890