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: A range of novel phenomena including partial focusing and splitting into multiple transmitted beams are observed and it is demonstrated that while some of these experimentally observed effects can be described within the approximation of an effective medium, a deeper understanding of the experimental results requires a rigorous study of internal eigenmodes of the lattice of resonators.
Abstract: We study experimentally propagation of electromagnetic waves through a slab of uniaxial magnetic metamaterial. We observe a range of novel phenomena including partial focusing and splitting into multiple transmitted beams. We demonstrate that while some of these experimentally observed effects can be described within the approximation of an effective medium, a deeper understanding of the experimental results requires a rigorous study of internal eigenmodes of the lattice of resonators.
12 citations
01 Jan 2009
TL;DR: The concept of metamaterials has much broader scope than that of left-handed materials (LHM) or negative refractive index materials (NIM) and has attracted intensive attention in the electromagnetic communities in the past years as discussed by the authors.
Abstract: Electromagnetic metamaterials, first known as left-handed materials (LHM) or negative refractive index materials (NIM), have attracted intensive attention in the electromagnetic communities in the past years Right now, the concept of metamaterials has much broader scope than that of LHM or NIM Metamaterials are actually macroscopic composites of periodic or non-periodic structures, whose function is due to both the cellular architectures and the chemical compositions This paper presents some recent progress on metamaterials, including the optical transformation theory, experiments on metamaterials, new physical discoveries and phenomena, the relationship between the computational electromagnetics and metamaterials, and real applications on microwave components and antennas
12 citations
TL;DR: In this article, a method for homogenizing tensor transmission-line metamaterials is presented, which employs a local field averaging procedure to compute the effective material parameters.
12 citations
TL;DR: In this article, a new type of bianisotropic metamaterial is theoretically investigated on the basis of a linear inhomogeneous field transformation applied to an arbitrary free-space Maxwellian field.
Abstract: A new type of bianisotropic metamaterial is theoretically investigated on the basis of a linear inhomogeneous field transformation applied to an arbitrary free-space Maxwellian field. This transformation does not include any space compression as predicted by transformation optics, and consists of a linear combination with space-dependent coefficients of the electric and magnetic incident fields. Duality conditions are applied to select an appropriate shape of the constituent dyads, thus resulting in a metamaterial completely defined by two real differentiable functions of space ? and ?. When these functions satisfy the condition ?2 + ?2 = constant on the medium contour, the medium becomes globally lossless, and when imposing ? = 0 and ? = 1 at the same boundary, the medium does not scatter for any arbitrary incident field, that is, it becomes invisible. When an additional internal boundary is introduced with boundary conditions ? = 0 and ? = 0, the medium becomes a perfect cloak. Explicit analytical results are given for an invisible sphere and for a spherical cloak to provide additional physical insight.
12 citations
TL;DR: In this paper, the authors report several techniques utilizing angled physical vapor deposition to obtain unique and complex 3D structures such as films with tapered thickness on planar substrates, tapered or uniform films on curved surfaces, and 3D nanorod arrays.
Abstract: The field of nanophotonics has experienced a dramatic development in recent years, which requires ample candidate structures to achieve desirable functionalities. For many novel device designs in emerging field of transformation optics, optical metamaterials, and others, non-uniform and non-conformal thin films as well as three-dimensional (3D) structures are necessary to achieve advanced functionalities. Here, we report several techniques utilizing angled physical vapor deposition to obtain unique and complex 3D structures such as films with tapered thickness on planar substrates, tapered or uniform films on curved surfaces, and 3D nanorod arrays. These structures could enrich the existing practical design space for applications in nanophotonics and nanoelectronics.
12 citations