Negative refraction based on purely imaginary metamaterials

Fu, Yangyang; Xu, Yadong; Chen, Huanyang

doi:10.1007/s11467-018-0781-3

Cited by 18 publications

(5 citation statements)

References 39 publications

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“…Interestingly, the coexistence of laser and anti-laser (coherent perfect absorption (CPA)) is also possible in PIM structures [27,30]. Inspired by the PT symmetry counterpart, there are some attempts to study the imaging phenomena in optics [28]. However, there are few works related to acoustic imaging based on PIM structures.…”

Section: Scattering Properties Of a Pim Slabmentioning

confidence: 99%

“…Thus, PIM is a homogeneous medium with a real refractive index. PIMs offer interesting underlying physics to explore and therefore they have been widely studied in the field of optics [7,[27][28][29] and have also been introduced into the field of acoustics [30,31]. Interestingly, the coexistence of laser and anti-laser (coherent perfect absorption (CPA)) is also possible in PIM structures [27,30].…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by the PT symmetry counterpart, there are some attempts to study the imaging phenomena in optics [28]. However, there are few works related to acoustic imaging based on PIM structures.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials

Zhang

Liu

2022

Applied Sciences

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Acoustic purely imaginary metamaterials (PIMs) contain loss and gain uniformly distributed in space, but in different parameters. Therefore, the PIMs contain the elements of gain and loss simultaneously. As a result, some extraordinary wave modes may appear depending on whether gain or loss elements dominate. In this work, we theoretically and numerically investigate the general excitation conditions for acoustic lasing, coherent perfect absorption (CPA) and for their co-existence in the framework of acoustic PIMs. All-angle negative refraction and planar focusing are achieved by pairing two PIM slabs with conjugating parameters. The proposed structure provides an alternative basis for possible applications of acoustic perfect imaging.

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Section: Scattering Properties Of a Pim Slabmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials

Zhang

Liu

2022

Applied Sciences

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“…The metasurface can be regarded as the two-dimensional corresponding structure of the metamaterial, which is an artificial layered anisotropic quasi-periodic structure array with a wavelength smaller than the thickness [1][2][3][4][5][6][7][8][9][10]. Metasurfaces have some extraordinary physical properties that are not found in materials in nature [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Recently, CUI et al putted forward the new concept of "encoding metamaterials" [26], and briefly described the related methods of programmable metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Broadband convolutional scattering characteristics of all dielectric transmission Pancharatnam–Berrygeometric phase metasurfaces

Li¹,

Jin²,

Jing³

et al. 2022

Optica Applicata

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In order to obtain the broadband scattering characteristics, we propose a superperiodic cell structure with all-dielectric material to construct Pancharatnam–Berry geometric phase encoding metasurfaces. Because we cannot design or prepare infinitesimal coding unit particles, according to the generalized Snell’s law, we can only obtain discrete scattering angle regulation for the basic coding metasurface sequence. In order to obtain multi-angle scattering characteristics, we introduce the Fourier convolution principle in digital signal processing on the Pancharatnam–Berry geometric phase encoding metasurfaces. By using the addition and subtraction operations on two encoding metasurface sequences, a new encoding metasurface sequence can be obtained with different deflection angle. Fourier convolution operations on the encoding metasurfaces can provide an efficient method in optimizing encoding patterns to achieve continuous scattering beams. The addition and subtraction methods are also applicable to the checkerboard coding mode. The combination of Fourier convolution principle and Pancharatnam–Berry phase coded metasurface in digital signal processing can realize more powerful electromagnetic wave manipulation capability.

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“…Recently, metasurface has been proposed as a development version of metamaterials [9][10][11][12][13][14]. Metasurface can be applied in holography, absorber, metalens, bound-state in continuum, etc [15][16][17][18][19]. Specially, metasurface can be also used in invisible cloaking [11].…”

Section: Introductionmentioning

confidence: 99%

Efficient carpet invisibility cloaking with dielectric resonant metasurfaces in terahertz region

Tian¹,

Feng²,

Fang³

et al. 2021

Laser Phys. Lett.

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The application of metasurface in invisibility technology is mainly based on its phase control function, which provides a new choice for the design of ultra-thin carpet cloaking devices with arbitrary shape. At present, most of the carpet cloaking devices mainly focus on metal structure metasurfaces. The Ohmic loss of metallic materials seriously affects the efficiency of cloaking devices. To reduce Ohmic loss and improve reflection efficiency, a dielectric resonance cylindrical harmonic oscillator is proposed to construct the metasurface layer. Based on the analysis of the principle of carpet reflection cloaking, a dielectric metasurface layer is optimized to cover a triangular scatterer, making it invisible. The near field and far field scattering characteristics of dielectric metasurface carpet cloaking device are numerically simulated to confirm its cloaking effect.

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Negative refraction based on purely imaginary metamaterials

Cited by 18 publications

References 39 publications

Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials

Acoustic Negative Refraction and Planar Focusing Based on Purely Imaginary Metamaterials

Broadband convolutional scattering characteristics of all dielectric transmission Pancharatnam–Berrygeometric phase metasurfaces

Efficient carpet invisibility cloaking with dielectric resonant metasurfaces in terahertz region

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