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 article, a new structure of magnetic metamaterials is proposed for megahertz wireless power transmission, which can be manually adjusted to work at a variable frequency ranging from 10∼30 Mhz.
Abstract: Over the past few years, various metamaterials have been designed and applied in antenna systems In this paper, a new structure of magnetic metamaterials is proposed for megahertz wireless power transmission, which can be manually adjusted to work at a variable frequency ranging from 10∼30 Mhz The S parameters, resonant frequency, effective permeability of metamaterials are computed for analysis The different substrates and layouts of metamaterial slab are also numerically evaluated by full-wave simulation The specific magnetic metamaterial slabs with 176 MHz are fabricated and experimentally verified by the network analyzer Finally, these slabs are applied in a more practical two-coil coupling system to evaluate their performance enhancement
29 citations
01 Jan 2015
TL;DR: Metamaterials are artificial electromagnetic media that are structured on the subwavelength scale as discussed by the authors, and they became a paradigm for engineering electromagnetic space and controlling propagation of waves through the transformation optics and optically-induced magnetic response.
Abstract: Metamaterials are artificial electromagnetic media that are structured on the subwavelength scale. Such structures were initially suggested for achieving the negative index of refraction, but later they became a paradigm for engineering electromagnetic space and controlling propagation of waves through the transformation optics and optically-induced magnetic response. The research agenda is now shifting towards tunable, switchable, nonlinear and sensing functionalities of metamaterials and their applications, and it involves the fields of metasurfaces and metadevices, with the recent demonstrations of breakthrough results with light-controlled metamaterials, nonlinear metamaterials, and tunable metasurfaces for MRI applications. Here, we briefly discuss the basic concepts of this rapidly growing research field, highlighting the recent developments in the physics of metamaterials, subwavelength nanophotonics, and graphene-based photonics.
29 citations
TL;DR: In this paper, the authors look at the interesting opportunities in curiosity-led research based around the ideas of transformation and metamaterials, and the genesis of this article was the Transforming Transformation Optics meeting held at Imperial College London in December 2013.
Abstract: Those researchers who are part of the metamaterials community stand at a fork in the road – does the maturation of metamaterial fabrication lead to a focus on applications and technology, or does it suggest an opportunity to pursue more blue-sky scientific concepts? At Metamaterials 2013 in Bordeuax, one speaker focussed explicitly on the opportunities for applications and funding on the road leading to metamaterial technology. Here, in deliberate contrast, we look instead at the interesting opportunities in curiosity-led research based around the ideas of transformation and metamaterials. The genesis of this article was the Transforming Transformation Optics meeting held at Imperial College London in December 2013.
29 citations
TL;DR: The process to design and fabricate devices using silicon as a platform for broad band operation in the optical domain using dielectric materials is described, including the carpet invisibility cloak, a broad bandwidth light concentrator, and a perfect imaging device, known as Maxwell's fish eye lens.
Abstract: Transformation optics allows the creation of innovative devices; however, its implementation in the optical domain remains challenging. We describe here our process to design and fabricate such devices using silicon as a platform for broad band operation in the optical domain. We discuss the approximations and methods employed to overcome the challenges of using dielectric materials as a platform for transformation optics, such as the anisotropy and gradient refractive index implementation. These encompass conformal and quasi-conformal mappings, and a dithering process to discretize and quantize the continuously inhomogeneous index function. We show examples of devices that we fabricated and tested, including the carpet invisibility cloak, a broad bandwidth light concentrator, and a perfect imaging device, known as Maxwell's fish eye lens. Finally, we touch on future directions under investigation to further develop transformation optics based on dielectric materials.
29 citations
TL;DR: It is found that the metamaterial possesses deep sub-wavelength resolution capabilities in the far field when there are two slits and the central silver layer is at least 36 nm in thickness, which has potential applications in superresolution imaging.
Abstract: We report beam splitting in a metamaterial composed of a silver-alumina composite covered by a layer of chromium containing one slit. By simulating distributions of energy flow in the metamaterial for H-polarized waves, we find that the beam splitting occurs when the width of the slit is shorter than the wavelength, which is conducive to making a beam splitter in sub-wavelength photonic devices. We also find that the metamaterial possesses deep sub-wavelength resolution capabilities in the far field when there are two slits and the central silver layer is at least 36 nm in thickness, which has potential applications in superresolution imaging.
29 citations