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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 article, a method for realizing electromagnetically inhomogeneous and anisotropic metamaterials using non-uniform transmission-line grids is presented, where the desired material parameter tensors are decomposed into their constituent eigenvectors and eigenvalues.
Abstract: We present a method for realizing electromagnetically inhomogeneous and anisotropic metamaterials using nonuniform transmission-line grids. The desired material parameter tensors are decomposed into their constituent eigenvectors and eigenvalues. Transmission lines are then aligned with the eigenvectors of the permeability tensor and loaded with reactive circuit elements to attain the desired eigenvalues (diagonal permeability and permittivity values). The method is shown for two separate 2-D transformation optical devices: a collimator and a field rotator. The collimator is simulated as a continuous inhomogeneous medium as well as a subwavelength-structured transmission-line grid, and the results closely agree.

12 citations

Journal ArticleDOI
TL;DR: The results show that the technique is simultaneously straightforward to be implement and effective in reducing the anisotropy of the transformation for an extremely low value close to zero.
Abstract: In this work the least squares method is used to reduce anisotropy in transformation optics technique. To apply the least squares method a power series is added on the coordinate transformation functions. The series coefficients were calculated to reduce the deviations in Cauchy-Riemann equations, which, when satisfied, result in both conformal transformations and isotropic media. We also present a mathematical treatment for the special case of transformation optics to design waveguides. To demonstrate the proposed technique a waveguide with a 30° of bend and with a 50% of increase in its output width was designed. The results show that our technique is simultaneously straightforward to be implement and effective in reducing the anisotropy of the transformation for an extremely low value close to zero.

12 citations

Proceedings ArticleDOI
12 Jun 2005
TL;DR: In this article, the authors proposed and analyzed the use of metamaterial planar layers for synthesizing compact subwavelength leaky-wave radiators in the microwave regime, and showed the salient guidance and radiation properties of the anomalous natural modes supported by these bilayered structures.
Abstract: Here we propose and analyze theoretically the use of metamaterial planar layers for synthesizing compact sub-wavelength leaky-wave radiators in the microwave regime. In particular, the possibility of pairing "conjugate" metamaterials in order to squeeze the dimensions of microwave components is explored here for the leaky-wave operation of an open waveguide consisting of a stack of grounded metamaterial layers. We show the salient guidance and radiation properties of the anomalous natural modes supported by these bilayered structures, giving further physical insights into the phenomenon.

12 citations

Journal ArticleDOI
TL;DR: Analytical and numerical studies of the effect of the separation distance between zeros of dielectric permittivity and magnetic permeability on the phenomena of resonant absorption and anomalous field enhancement in transition metamaterials indicate that these phenomena are robust and strongly polarization-dependent in the presence of the spatial shift between these points.
Abstract: We report analytical and numerical studies of the effect of the separation distance between zeros of dielectric permittivity and magnetic permeability on the phenomena of resonant absorption and anomalous field enhancement in transition metamaterials. Our studies indicate that these phenomena are robust and strongly polarization-dependent in the presence of the spatial shift between these points. These results are likely to be important for future fundamental and applied studies in the areas of transformation, polarization, and nonlinear optics in metamaterials.

12 citations

Journal ArticleDOI
TL;DR: In this article, a series of invisibility concentrators with simplified material parameters beyond transformation optics is presented, which can achieve the perfect invisible effect at frequencies of Fabry-Perot resonances, while others have very small scattering.
Abstract: We present a series of invisibility concentrators with simplified material parameters beyond transformation optics. One of them can achieve the perfect invisible effect at frequencies of Fabry–Perot resonances, while others have very small scattering. The required materials are feasible in practice. Analytical calculations and numerical simulations confirm the functionalities of these devices.

12 citations


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