Broadband and Broad-Angle Low-Scattering Metasurface Based on Hybrid Optimization Algorithm

Wang, Ke; Zhao, Jie; Cheng, Qiang; Dong, Di; Cui, Tie Jun

doi:10.1038/srep05935

Cited by 164 publications

(110 citation statements)

References 32 publications

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“…During the optimization, we use a far-field pattern prediction algorithm 35 as an auxiliary module to save the effort required for tremendous full-wave simulations. Here, the equivalent conducting current, magnetic current, and electric current of each coding element are extracted by the numerical simulation of the unit cell, and they can be used to rapidly predict the scattering pattern of the coding metasurface.…”

Section: Broadband Diffusion Of Terahertz Wavesmentioning

confidence: 99%

“…Based on similar principles, other physical phenomena have been investigated using gradient-phase metasurfaces, such as optical vortexes 29 , light bending 30 , the photonic spin Hall effect 31 , polarization traffic control 32 , and the efficient conversion of surface plasmon polaritons 33 . When the local reflection phases of unit cells are randomly distributed, the metasurfaces can be used to reduce the scatter fields of the microwaves 34,35 . In the terahertz frequencies, metasurfaces have also played important roles in producing novel functionalities [8][9][10][11][12] , including high-efficiency terahertz modulators based on active metamaterial particles 8,9 , low-loss polarization conversions 10 , and the abnormal reflections and transmissions of terahertz waves [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

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Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

et al. 2015

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The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light waves. In the past decade, metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functional devices. Here, we present a new approach to manipulate terahertz waves by using coding metasurfaces that are composed of digital coding elements. We propose a general coding unit based on a Minkowski closed-loop particle that is capable of generating 1-bit coding (with two phase states of 0 and 1806), 2-bit coding (with four phase states of 0, 906, 1806, and 2706), and multi-bit coding elements in the terahertz frequencies by using different geometric scales. We show that multi-bit coding metasurfaces have strong abilities to control terahertz waves by designing-specific coding sequences. As an application, we demonstrate a new scattering strategy of terahertz waves-broadband and wide-angle diffusion-using a 2-bit coding metasurface with a special coding design and verify it by both numerical simulations and experiments. The presented method opens a new route to reducing the scattering of terahertz waves.

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Section: Broadband Diffusion Of Terahertz Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

et al. 2015

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“…Another approach named "coding metamaterial" has also been paid great atention by the scientiic community, which is composed of several types of unit cells, with diferent constant phase responses, respectively [67][68][69][70]. Figure 9h shows a 1-bit coding metamaterial, composed of two types of unit cells, with 0 and π phase responses (as shown in Figure 9i), which is named "0" and "1" elements, respectively [67].…”

Section: Information Coding and Wave Coding With Metamaterials Devicesmentioning

confidence: 99%

Polarization State Manipulation of Electromagnetic Waves with Metamaterials and Its Applications in Nanophotonics

Chen¹,

Liu²,

Li³

et al. 2017

Metamaterials - Devices and Applications

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Polarization state is an important characteristic of electromagnetic waves. The arbitrary control of the polarization state of such wave has atracted great interest in the scientiic community because of the wide range of modern optical applications that such control can aford. Recent advances in metamaterials provide an alternative method of realizing arbitrary manipulation of polarization state of electromagnetic waves in nanoscale via ultrathin, miniaturized, and easily integrable designs. In this chapter, we give a review of recent developments on polarization state manipulation of electromagnetic waves in metamaterials and discuss their applications in nanophotonics, such as polarization converter, wavefront controller, information coding, and so on.

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“…In particular, this kind of MS merely reflects the incident waves into the backward space rather than transforming electromagnetic energy into heat, such as metamaterial absorbers [11][12][13][14][15], which lowers the probability of MS being detected by infrared devices. To broaden the application fields, the MS with additional properties, such as low profile [16,17], flexible scattering beams [18][19][20], broadband and wide angle [21][22][23][24][25], have also been studied and reported in depth, among which the MS with property of broadband can be further studied for the insufficient RCS reduction at certain bands, even if the condition of sufficient phase cancellation (phase difference ∈ [150 • , 210 • ] [26]) between two elements is satisfied in the element simulation. For example, Ref.…”

Section: Introductionmentioning

confidence: 99%

Further Wideband RCS Reduction on Metasurface by Introducing a Phasor Interference Element

Han¹,

Cao²,

Gao³

2017

PIER C

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Abstract-A novel method for further wideband RCS reduction on metasurface (MS) is proposed in this paper. By introducing a phasor interference element to the original MS composed of two elements, RCS of the proposed MS constructed by three elements can be further remarkably decreased in broadband. The measurement procedure on scattering performances of samples is conducted in an anechoic chamber, in which the experimental results indicate that the proposed MS can achieve further 3-dB RCS reduction from 6.94 GHz to 15.35 GHz compared to the original MS, and the maximum further reduction reaches 24.9 dB. As a result, compared with a same-size metallic plate illuminated by a normal plane wave, RCS of the proposed MS can be reduced by more than 8.5-dB from 6.68 GHz to 15.38 GHz with the relative bandwidth of 78.9%.

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Broadband and Broad-Angle Low-Scattering Metasurface Based on Hybrid Optimization Algorithm

Cited by 164 publications

References 32 publications

Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

Polarization State Manipulation of Electromagnetic Waves with Metamaterials and Its Applications in Nanophotonics

Further Wideband RCS Reduction on Metasurface by Introducing a Phasor Interference Element

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