Broadband Ground-Plane Cloak

Liu, R.; Ji, Chengang; Mock, Jack J.; Chin, Jessie Yao; Cui, Tie Jun; Smith, David R.

doi:10.1126/science.1166949

Cited by 1,367 publications

(892 citation statements)

References 21 publications

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“…A number of new designs are proposed to mitigate these constraints. [89][90][91][92][93][94][95] In particular, the carpet cloak can significantly relax the variation range of the material properties, [89][90][91][92] since the carpet cloak compresses the curved surface in only one direction into a conducting sheet and hence a quasi-conformal mapping technique can be applied to the two-dimensional system. Any arbitrarily shaped object placed behind the curved bump will maintain the reflectance of a smooth, flat surface, rendering the object invisible.…”

Section: Transformation Opticsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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Metamaterials, artificial composite structures with exotic material properties, have emerged as a new frontier of science involving physics, material science, engineering and chemistry. This critical review focuses on the fundamentals, recent progresses and future directions in the research of electromagnetic metamaterials. An introduction to metamaterials followed by a detailed elaboration on how to design unprecedented electromagnetic properties of metamaterials is presented. A number of intriguing phenomena and applications associated with metamaterials are discussed, including negative refraction, sub-diffraction-limited imaging, strong optical activities in chiral metamaterials, interaction of meta-atoms and transformation optics. Finally, we offer an outlook on future directions of metamaterials research including but not limited to three-dimensional optical metamaterials, nonlinear metamaterials and ''quantum'' perspectives of metamaterials (142 references).

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Section: Transformation Opticsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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“…The approach allows the use of non-resonant elements (e.g., conventional dielectric materials) and offers the possibility to achieve low-loss and broadband cloaking at optical wavelengths, rendering an object truly undetectable with visible or infrared light. Carpet cloaking was recently realized experimentally at microwave frequencies, utilizing non-resonant metallic elements [20].…”

mentioning

confidence: 99%

An optical cloak made of dielectrics

Valentine¹,

Li²,

Zentgraf³

et al. 2009

Nature Mater

1,263

867

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Invisibility or cloaking has captured human's imagination for many years. With the recent advancement of metamaterials, several theoretical proposals show cloaking of objects is possible, however, so far there is a lack of an experimental demonstration at optical frequencies. Here, we report the first experimental realization of a dielectric optical cloak. The cloak is designed using quasi-conformal mapping to conceal an object that is placed under a curved reflecting surface which imitates the reflection of a flat surface. Our cloak consists only of isotropic dielectric materials which enables broadband and low-loss invisibility at a wavelength range of 1400-1800 nm.

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“…Cloaks [17][18][19][20][21], bends and waveguide connectors [22][23][24][25][26], concentrators [27][28][29], and new types of lenses and antennas [30][31][32][33][34][35][36] are some examples of such innovative components. Anisotropic, inhomogeneous [37] and even materials with negative constitutive parameters [38] are among media, which can be realized using metamaterials. Furthermore, incorporating magnetic resonators, such as split ring resonators [39] or metallic parallel plates [40], into the metamaterial is often used for realizing negative permeability.…”

Section: Introductionmentioning

confidence: 99%

Design of a Pyramidal Horn Antenna With Low E-Plane Sidelobes Using Transformation Optics

Shahcheraghi¹,

Yahaghi²

2015

PIER M

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Abstract-Transformation optics is a convenient way to control the pattern of electromagnetic fields. In this paper, using a novel transformation, we propose the design procedure of a horn antenna having low backlobe and sidelobe levels in its E-plane. By applying conformal transformation, the rectangular horn proposed in this paper can be realized with isotropic materials. This proposed antenna can be easily implemented by both ordinary dielectric materials and isotropic graded refractive index (GRIN) materials. In the first proposed design, in addition to the isotropy, homogeneity is furthermore introduced into the horn, and only four kinds of isotropic materials are required throughout. In the second design, it is demonstrated that the designed structure can also be implemented by graded photonic crystals (GPCs) operating in metamaterial regime. They have low loss as well as broad frequency band and are easy to implement. Simulation results are presented to validate the design approach.

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Broadband Ground-Plane Cloak

Cited by 1,367 publications

References 21 publications

Metamaterials: a new frontier of science and technology

Metamaterials: a new frontier of science and technology

An optical cloak made of dielectrics

Design of a Pyramidal Horn Antenna With Low E-Plane Sidelobes Using Transformation Optics

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