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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15 Jul 2019
TL;DR: In this article, two designs of complementary spiral-shape metamaterials with square and hexagonal meta-atom arrangements in the terahertz (THz) frequency range are presented.
Abstract: We propose and demonstrate two designs of complementary spiral-shape metamaterials (CSSM) with square and hexagonal meta-atom arrangements in the terahertz (THz) frequency range. For convenience, they are denoted as CSSM-S and CSSM-H for CSSM with square and hexagonal meta-atom arrangements, respectively. The electromagnetic responses are investigated for CSSM with different spiral angle (θ). CSSM-S exhibits dual-, triple-, and quad-resonance for θ = 360°, θ = 540° and θ = 720°, respectively in transverse electric (TE) mode and exhibits single-, dual-, and triple-resonance for θ = 360°, θ = 540° and θ = 720°, respectively in transverse magnetic (TM) mode. By applying a direct-current (dc) bias voltage on CSSM-S, it shows the actively tunable resonance with a tuning range of 0.12 THz and switching polarization characteristics. Furthermore, to facilitate the flexibility and applicability of CSSM, the unit cell of CSSM with different θ is superimposed to form CSSM-H. CSSM-H possesses the combination of electromagnetic behaviors generated by each unit cell of CSSM with different θ. This study provides a design of complementary THz metamaterials to have electromagnetically induced transparency (EIT) analog characteristics, which shows single-digital and multi-digital signals for the programmable metamaterial application. It paves a way to the possibility of THz metamaterials with great tunability and good polarization-dependence.
19 citations
10 Sep 2002
TL;DR: In this paper, an overview of the electromagnetic properties of complex media and metamaterials with negative real permittivity and permeability is given and various ideas for potential applications of these materials are presented.
Abstract: An overview of the electromagnetic properties of complex media and metamaterials, particularly metamaterials with negative real permittivity and permeability, is given and various ideas for potential applications of these materials will be presented.
19 citations
TL;DR: In this paper, a waveguide-based approach is proposed to create an inhomogeneous artificial medium, which does not rely on engineered subwavelength-scale components. But it does not have the cloaking properties such as light trapping and cloaking.
Abstract: The field of metamaterials and the formalism of transformation optics have provided a prescription for constructing artificial dielectrics with unique properties such as light trapping and cloaking. Here, we describe a different approach to creating an inhomogeneous artificial medium, based on waveguide techniques, which does not rely on engineered subwavelength-scale components. We demonstrate a mirage effect in which an object several times larger than the selected wavelength is rendered invisible by bending a beam around it.
19 citations
TL;DR: It is shown that layered structure with alternating dielectrics of positive and negative permittivities can be used to design concentrators of similar function.
Abstract: A microwave prototype of field concentrator was recently fabricated, based on the combination of transformation optics and Fabry-Perot resonances. Perfect electric conductors used as design elements is however, impossible when the working frequencies go to infrared or optical frequencies. Here in this paper, we show that layered structure with alternating dielectrics of positive and negative permittivities can be used to design concentrators of similar function. A practical design with only two kinds of semiconductors is suggested. Theoretical analysis and numerical simulations are performed to verify the concentrating effect.
19 citations
TL;DR: In this article, a generalization of invisibility cloaking is presented, where instead of an empty region of space, an inhomogeneous structure is transformed via Pendry's map in order to give, to any object hidden in the central hole of the cloak, a completely arbitrary appearance.
Abstract: In this paper, transformation optics is presented together with a generalization of invisibility cloaking: instead of an empty region of space, an inhomogeneous structure is transformed via Pendry's map in order to give, to any object hidden in the central hole of the cloak, a completely arbitrary appearance. Other illusion devices based on superlenses considered from the point of view of transformation optics are also discussed.
19 citations