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, the authors proposed and experimentally demonstrated a wideband linear polarization converter in a reflection mode operating from 2.4 to 4.2 THz with conversion efficiency of more than 80%.
Abstract: We propose and experimentally demonstrate a wideband linear polarization converter in a reflection mode operating from 2.4 to 4.2 THz with conversion efficiency of more than 80%. Our device can expand the applications to a higher frequency band. A numerical simulation is performed for this metamaterial converter, which shows a good agreement with experimental results. Importantly, a concise and intuitive calculating model is proposed for the Fabry–Perot cavity. The theoretical results indicate that the underlying reason for the enhanced polarization conversion is the additional phase difference induced by the resonance of the meta-structure and multiple reflections within the Fabry–Perot cavity.
16 citations
TL;DR: In this paper, the authors present a simple mechanism for a perfect impedance-matched left-handed metamaterials, that reveals a nearly zero reflection over operating frequency. This finding is based on the independent manipulation of the electric response without any effect on the magnetic one.
Abstract: Matching the impedance of a medium to free space, which is usually not available in natural materials, is an important advance in metamaterials. In this paper, we present a simple mechanism for a perfect impedance-matched left-handed metamaterials, that reveals a nearly zero reflection over operating frequency. This finding is based on the independent manipulation of the electric response without any effect on the magnetic one.
15 citations
TL;DR: Based on the non-Euclidean transformation optics, this article designed a thin metamaterial lens that can achieve wide-beam radiation by embedding a simple source (a point source in 3D case or a line current source in 2D case).
Abstract: Based on the non-Euclidean transformation optics, we design a thin metamaterial lens that can achieve wide-beam radiation by embedding a simple source (a point source in three-dimensional case or a line current source in two-dimensional case). The scheme is performed on a layer-by-layer geometry to convert curved surfaces in virtual space to flat sheets, which pile up and form the entire lens in physical space. Compared to previous designs, the lens has no extreme material parameters. Simulation results confirm its functionality.
15 citations
TL;DR: In this article, an analytical theory that allows to bring established microwave metamaterials models to optical wavelengths is presented, which is implemented for nano-scaled plasmonic wire-mesh and tri-helical metammaterials and obtained an accurate pre-diction for their dispersive behaviour at optical and near-IR wavelengths.
Abstract: (Dated: February 12, 2013; Revised)Recent advances in nano-fabrication techniques allow for the manufacture of optical metamateri-als, bringing their unique and extra-ordinary properties to the visible regime and beyond. However,an analytical description of optical nano-plasmonic metamaterials is challenging due to the char-acteristic optical behaviour of metals. Here we present an analytical theory that allows to bringestablished microwave metamaterials models to optical wavelengths. This method is implementedfor nano-scaled plasmonic wire-mesh and tri-helical metamaterials, and we obtain an accurate pre-diction for their dispersive behaviour at optical and near-IR wavelengths.
15 citations
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TL;DR: In this paper, transformation-optics based cloaking in acoustic and electromagnetic scattering is considered and various regularized approximate cloaking schemes have been developed in order to avoid the singular structures.
Abstract: We consider transformation-optics based cloaking in acoustic and electromagnetic scattering. The blueprints for an ideal cloak use singular acoustic and electromagnetic materials, posing server difficulties to both theoretical analysis and practical fabrication. In order to avoid the singular structures, various regularized approximate cloaking schemes have been developed. We survey these developments in this paper. We also propose some challenging issues for further investigation.
15 citations