Topic
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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TL;DR: In this paper, transformation optics recipes can be applied to control the flow of surface plasmons on metal-dielectric interfaces, leading to almost perfect functionalities for surface plasmonons.
Abstract: In this paper we analyze how Transformation Optics recipes can be applied to control the flow of surface plasmons on metal-dielectric interfaces. We study in detail five different examples: a cylindrical cloak, a beam shifter, a right-angle bend, a lens and a ground-plane cloak. First, we demonstrate that only the modification of the electric permittivity and magnetic permeability in the dielectric side can lead to almost perfect functionalities for surface plasmons. We also show that, thanks to the quasi two-dimensional character of surface plasmons and its inherent polarization, the application of conformal and quasiconformal mapping techniques allows the design of plasmonic devices in which only the isotropic refractive index of the dielectric film needs to be engineered.
21 citations
TL;DR: This work proposes two practical configurations for mode conversion, which only consist of homogeneous materials yielded from linear coordinate transformations and demonstrates the functionalities of the converters by full wave simulations.
Abstract: A metal-insulator-metal (MIM) waveguide can support two plasmonic modes. Efficient conversion between the two modes can be achieved by reshaping of both phase and power density distributions of the guided mode. The converters are designed with the assistance of transformation optics. We propose two practical configurations for mode conversion, which only consist of homogeneous materials yielded from linear coordinate transformations. The functionalities of the converters are demonstrated by full wave simulations. Without consideration of transmission loss, conversion efficiency of as high as 95% can be realized.
21 citations
TL;DR: It is shown that an isotropic plate of uniform thickness, with appropriately designed refractive index and dispersion, can match the phase over the whole visible spectrum and support the fundamental limits on cloaking for broadband vs. omnidirectionality.
Abstract: We complete the ‘paraxial’ (small-angle) ray optics cloaking formalism presented previously [Opt. Express22, 29465 (2014)], by extending it to the full-field of light. Omnidirectionality is then the only relaxed parameter of what may be considered an ideal, broadband, field cloak. We show that an isotropic plate of uniform thickness, with appropriately designed refractive index and dispersion, can match the phase over the whole visible spectrum. Our results support the fundamental limits on cloaking for broadband vs. omnidirectionality, and provide insights into when anisotropy may be required.
21 citations
TL;DR: In this article, the effects of different boundary conditions on triangular split ring resonator (TSRR)-shaped metamaterials in X band frequency regime were investigated and the experimental and simulation results were complying with each other.
Abstract: This study aims to demonstrate the effects of the different boundary conditions on triangular split ring resonator (TSRR)-shaped metamaterials in X band frequency regime. Three different TSSR-shaped metamaterials are designed and simulated in a certain frequency range. TSSR-shaped metamaterials are utilized to show that the use of different boundary conditions may result in completely different electromagnetic responses. Characterization is explained by applying 5 different boundary conditions. To verify simulation results, an experimental study is realized for the unit cell boundary condition. Both experimental and simulation results are complying with each other. For further investigation, electrical energy density and surface current distributions are simulated and discussed.
21 citations
Journal Article•
TL;DR: In this article, the authors used Mu and Epsilon-Near Zero (MENZ) metamaterials to realize the substrates that can modify the emission of an embedded line source.
Abstract: In this work, we use Mu and Epsilon-Near-Zero (MENZ) metamaterials to realize the substrates that can modify the emission of an embedded line source. Simulation results show that the cylindrical waves emitted from the line source can be perfectly converted to plane wave through the MENZ metamaterial slab with planar exit face. Hence the line source together with the metamaterial slab constructs a high directive slab antenna. The directive radiation pattern of the MENZ metamaterial-assisted slab antenna is independent on the thickness of the slab, the position of the line source, and the shape of the entrance face of the slab, but the slab with grooved entrance side will result in stronger far-field intensity. We also show that the MENZ metamaterials can be applied to the design of antenna array. Moreover, compared with the high directive slab antenna obtained by coordinate transformation approach, the MENZ metamaterial-assisted antenna is more preferable.
21 citations