Gradient index metamaterials realized by drilling hole arrays

Mei, Zhong Lei; Bai, Jing; Cui, Tie Jun

doi:10.1088/0022-3727/43/5/055404

Cited by 76 publications

(33 citation statements)

References 25 publications

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“…In fact, the antenna can be implemented by using either the ordinary dielectrics (e.g., through drilling sub-wavelength hole arrays [33]) or the nonresonant metamaterials (e.g., I-shaped unit cells [6]), which has broad bandwidth, low loss and is easily realizable. Moreover, the device can be scaled down to work at the optical frequencies.…”

Section: Resultsmentioning

confidence: 99%

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A Planar Focusing Antenna Design With the Quasi-Conformal Mapping

Mei¹,

Bai²,

Niu³

et al. 2010

PIER M

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Abstract-We propose a planar focusing antenna design, which has the same performance as its parabolic counterparts and can be realized using PEC-backed gradient index dielectrics. In this design, quasi-conformal transformation optics is first utilized to transform a parabolic surface into a planar one, then the anisotropy factor of the resultant material is minimized, and the material is approximately treated as isotropic. Examples with realizable material parameters are given, and the simulation results validate the design. The proposed method could be used to design planar focusing antennas with high directivity and similar devices. The idea can also be applied to new device designs in optics engineering.

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Section: Resultsmentioning

confidence: 99%

“…These gradient-index materials can be easily implemented with either nonresonant metamaterials or nonmagnetic dielectrics based on the effective medium theory [6,33]. Thus the antenna is broadband in nature and could be scaled down to optical frequencies.…”

Section: Introductionmentioning

confidence: 99%

A Planar Focusing Antenna Design With the Quasi-Conformal Mapping

Mei¹,

Bai²,

Niu³

et al. 2010

PIER M

Self Cite

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“…It is an interesting observation that the stepped matching regions we have considered here could be thought of as discretization of the permittivity distribution in a gradient-index (GRIN) lens (see e.g., [30][31][32]). Similarly to most GRIN-lenses, the permittivity distribution in Design E and F presented here is monotonically decreasing from the maximum value, as we move closer to the air-dielectric interface.…”

Section: Discussionmentioning

confidence: 99%

Optimization of Micromachined Millimeter-Wave Planar Silicon Lens Antennas With Concentric and Shifted Matching Regions

Frid¹,

Töpfer²,

Bhowmik³

et al. 2017

PIER C

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Abstract-This paper presents a study of planar silicon lens antennas with up to three steppedimpedance matching regions. The effective permittivity of the matching regions is tailor-made by etching periodic holes in the silicon substrate. The optimal thickness and permittivity of the matching regions were determined by numerical optimization to obtain the maximum wideband aperture efficiency and smallest side-lobes. We introduce a new geometry for the matching regions, referred to as shifted matching regions. The simulation results indicate that using three shifted matching regions results in twice as large aperture efficiency as compared to using three conventional concentric matching regions. By increasing the number of matching regions from one to three, the band-averaged gain is increased by 0.3 dB when using concentric matching regions, and by 3.7 dB when using shifted matching regions, which illustrates the advantage of the proposed shifted matching region design.

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“…The materials in regions I, II, III and IV are fabricated by drilling different sizes of holes in four pieces of different dielectric plates 35 , whose permittivities are 2.2, 3.5, 7.5 and 16, respectively. The detailed sizes of the holes in each part are listed in Supplementary Table S1.…”

Section: Methodsmentioning

confidence: 99%

Broadband asymmetric waveguiding of light without polarization limitations

Hou

et al. 2013

Nat Commun

109

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Optical diodes are fundamental elements for optical computing and information processing. Attempts to realize such non-reciprocal propagation of light by breaking the time-reversal symmetry include using indirect interband photonic transitions, the magneto-optical effect, optical nonlinearity or photonic crystals. Alternatively, asymmetric reciprocal transmission of light has been proposed in photonic metamaterial structures for either circularly or linearly polarized waves. Here we employ the recent concept of gradient index metamaterials to demonstrate a waveguide with asymmetric propagation of light, independent of polarization. The device blocks both transverse electric and magnetic polarized modes in one direction but transmits them in the other for a broadband spectrum. Unlike previous works using chiral properties of metamaterials, our device is based on the principle of momentum symmetry breaking at interfaces with phase discontinuities. Experiments in the microwave region verify our findings, which may pave the way to feasible passive optical diodes.

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Gradient index metamaterials realized by drilling hole arrays

Cited by 76 publications

References 25 publications

A Planar Focusing Antenna Design With the Quasi-Conformal Mapping

A Planar Focusing Antenna Design With the Quasi-Conformal Mapping

Optimization of Micromachined Millimeter-Wave Planar Silicon Lens Antennas With Concentric and Shifted Matching Regions

Broadband asymmetric waveguiding of light without polarization limitations

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