Realization of ultrahigh refractive index in terahertz region by multiple layers coupled metal ring metamaterials

Fang, Bo; Cai, Zhiyu; Peng, Yandong; Li, Chenxia; Hong, Zhi; Jing, Xufeng

doi:10.1080/09205071.2019.1608868

Cited by 72 publications

(16 citation statements)

References 38 publications

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“…The phase difference accumulated during the propagation of light waves in transmission phase metasurfaces DOI: 10.1002/qute.202300124 is primarily used to construct metasurface devices. [37][38][39][40][41][42][43] Geometric phase metasurfaces use the phase difference generated by the different geometric paths of the electromagnetic wave in the process of polarization state transformation to control the light wave transmission phase. [45][46][47][48][49][50][51][52][53][54][55][56] Currently, most metasurface devices are based on single-phase modulation.…”

Section: Introductionmentioning

confidence: 99%

Flexible Control of Phase and Polarization based on All‐Dielectric Metamaterials

Zhang

et al. 2023

Adv Quantum Tech

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A metasurface is a planar structure that can flexibly control the polarization, phase, and amplitude of incident electromagnetic waves. An all‐dielectric hexagonal cell structure to reduce the interaction between cells and achieve efficient parametric regulation of electromagnetic waves is proposed. The single resonant transmission phase and the geometric phase are superimposed to realize the composite phase unit structure and construct a multifunctional flat metasurface device. The designed metasurface can flexibly tune the phase and polarization of incident electromagnetic waves and enable multifunctional integration phenomena, such as polarization separation, light intensity convergence, and vector light generation, on a single metasurface.

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Section: Introductionmentioning

confidence: 99%

Flexible Control of Phase and Polarization based on All‐Dielectric Metamaterials

Zhang

et al. 2023

Adv Quantum Tech

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“…[11][12][13][14] The 2D form of electromagnetic metamaterials is called as the electromagnetic metasurfaces, or "metasurfaces" for short. [15][16][17][18][19][20][21][22][23][24] A metasurface is a subwavelength artificial layered metamaterial, which can flexibly and effectively control the phase, amplitude, polarization, propagation mode and other characteristics of electromagnetic waves. In recent years, the research and application of metasurfaces are more extensive, and the development prospects are also broader.…”

Section: Introductionmentioning

confidence: 99%

Transmitted Electromagnetic Beam Steering of Pyramid All‐Dielectric Encoding Surface Microstructure

Zhao,

Zhang,

Fang

et al. 2023

Adv Quantum Tech

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A transmission‐type all‐medium element is proposed to construct a coded metasurface. Due to the single‐layer metasurface unit structure, large reflection loss will be caused when the base plane is incident. In order to improve the efficiency of the coded metasurface device and reduce the reflection loss, the authors propose a double‐sided metasurface digital unit structure and introduces a wideband anti‐reflection pyramid microstructure to achieve significantly improved transmission characteristics. The optimized unit structure is coded and the coded metasurface is constructed. Different coding metasurface sequences are constructed based on 1‐bit, 2‐bit, and 3‐bit digital coding units. According to generalized Snell's law, the number of transmitted beams can be controlled. The authors introduce complex code addition theory to construct multifunctional beam control metasurface. Based on the far field scattering theory of metasurface, the addition theory of different sequences of transmission‐coded metasurface is analyzed. The addition operation of the superposition of two sets of symmetric double beams and two sets of ordinary double beams can be realized. Based on the analysis of far‐field scattering characteristics, the multifunctional coded metasurface is demonstrated, that is, multiple functions are simultaneously superimposed in one array without interference.

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“…Also, the concept of encoding metasurface began to capture people's attention. For example, it can flexibly and efficiently change the characteristics of electromagnetic wave amplitude, phase, propagation mode and other aspects [27][28][29][30][31][32][33][34][35][36][37][38][39]. At the same time, it also has the advantages of simple preparation process, large-scale integration, low loss, etc., which also makes encoding metasurfaces have broad application prospects in the fields of holographic imaging [27], vortex beam generation [16,17], and stealth technology.…”

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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Realization of ultrahigh refractive index in terahertz region by multiple layers coupled metal ring metamaterials

Cited by 72 publications

References 38 publications

Flexible Control of Phase and Polarization based on All‐Dielectric Metamaterials

Flexible Control of Phase and Polarization based on All‐Dielectric Metamaterials

Transmitted Electromagnetic Beam Steering of Pyramid All‐Dielectric Encoding Surface Microstructure

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

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