High-performance meta-devices based on multilayer meta-atoms: interplay between the number of layers and phase coverage

Yang, Bicheng; Liu, Tong; Guo, Haitao; Xiao, Shiyi; Zhou, Lei

doi:10.1016/j.scib.2019.05.028

Cited by 75 publications

(31 citation statements)

References 49 publications

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“…To understand the intriguing experimental results reported in last section, we employ a CMT model to analyze the EM properties of such tunable metasurfaces . Noting that the metallic mesh can well block EM waves at frequencies below 25 GHz (the cutoff frequency of the mesh), thus severing as an optically opaque background for the whole system, and the patches on two A layers provide two electric resonances, we can describe such a system as a two‐port model with two resonators embedded inside an opaque background (see Figure a).…”

Section: Cmt Analyses On Experimental Resultsmentioning

confidence: 99%

“…Therefore, according to the CMT model, we find that the time evolution of the amplitudes a i ( i = 1, 2) of two resonant modes (contributed by two A layers) are governed by the following equations

\frac{1}{2 π} \frac{d}{d t} (\begin{matrix} a_{1} \\ a_{2} \end{matrix}) = [i (\begin{matrix} f_{1} & κ \\ κ & f_{2} \end{matrix}) + (\begin{matrix} - Γ_{1} & X \\ X & - Γ_{2} \end{matrix}) + (\begin{matrix} - Γ_{1}^{A} & 0 \\ 0 & - Γ_{2}^{A} \end{matrix})] (\begin{matrix} a_{1} \\ a_{2} \end{matrix}) + (\begin{matrix} d_{11} & d_{21} \\ d_{12} & d_{22} \end{matrix}) (\begin{matrix} S_{1}^{In} \\ S_{2}^{In} \end{matrix})

where f 1 and f 2 are the resonating frequencies of two modes, Γ i and

{normalΓ}_{i}^{A}

are the radiation and absorptive decay rates of the i th mode ( i = 1, 2), d ni describes the coupling between the i th mode and the n th external port ( n = 1, 2 stands for the reflection and transmission ports, respectively), κ denotes the near‐field coupling between two “modes” through the evanescent‐wave overlapping across the metallic mesh, and

X

denotes the interactions between two resonant modes at the far field. We note that X and Γ i are not independent parameters, but are correlated with each other via

X = - (d_{11}^{*} d_{12} + d_{21}^{*} d_{22}) / 2

and Γ i = (| d 1 i | 2 + | d 2 i | 2 )/2 . Moreover, while Equation applies to general two‐mode sy...…”

Section: Cmt Analyses On Experimental Resultsmentioning

confidence: 99%

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A Tunable Metasurface with Switchable Functionalities: From Perfect Transparency to Perfect Absorption

Lin

Guo

et al. 2020

Advanced Optical Materials

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191

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A thin screen exhibiting dynamically switchable transmission/absorption functionalities is highly desired in practice. However, a trilayer transmissive metasurface with active elements controlled in a uniform manner cannot exhibit independently controlled transmission and absorption properties due to intriguing interplays between the scattering and absorbing properties in systems exhibiting inversion symmetries. This motivates to employ the coupled‐mode theory to establish a generic phase diagram for such transmissive metasurfaces with active elements loaded in different layers tuned independently and to guide researchers design tunable metadevices with completely decoupled transmission/absorption responses. Based on such a phase diagram, a microwave metasurface is designed/fabricated with PIN diodes incorporated, and it is experimentally demonstrated that its functionality can switch from perfect transparency to perfect absorption, controlled by external voltages applied across the diodes. In addition to finding immediate applications in practice (e.g., smart radomes), the results of this study also provide a new type of tunable meta‐atom for building metasurfaces with flexible wave‐front control abilities.

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Section: Cmt Analyses On Experimental Resultsmentioning

confidence: 99%

\frac{1}{2 π} \frac{d}{d t} (\begin{matrix} a_{1} \\ a_{2} \end{matrix}) = [i (\begin{matrix} f_{1} & κ \\ κ & f_{2} \end{matrix}) + (\begin{matrix} - Γ_{1} & X \\ X & - Γ_{2} \end{matrix}) + (\begin{matrix} - Γ_{1}^{A} & 0 \\ 0 & - Γ_{2}^{A} \end{matrix})] (\begin{matrix} a_{1} \\ a_{2} \end{matrix}) + (\begin{matrix} d_{11} & d_{21} \\ d_{12} & d_{22} \end{matrix}) (\begin{matrix} S_{1}^{In} \\ S_{2}^{In} \end{matrix})

where f 1 and f 2 are the resonating frequencies of two modes, Γ i and

{normalΓ}_{i}^{A}

X

denotes the interactions between two resonant modes at the far field. We note that X and Γ i are not independent parameters, but are correlated with each other via

X = - (d_{11}^{*} d_{12} + d_{21}^{*} d_{22}) / 2

and Γ i = (| d 1 i | 2 + | d 2 i | 2 )/2 . Moreover, while Equation applies to general two‐mode sy...…”

Section: Cmt Analyses On Experimental Resultsmentioning

confidence: 99%

A Tunable Metasurface with Switchable Functionalities: From Perfect Transparency to Perfect Absorption

Lin

Guo

et al. 2020

Advanced Optical Materials

Self Cite

191

View full text Add to dashboard Cite

show abstract

“…Besides LSP, surface plasmon polaritons (SPPs) also have useful applications, such as SPP-enabled slow light devices [18] and SPP-induced transparency [19,20]. At the same time, spoof surface plasmon polariton (SSPPs) at microwave frequencies exhibiting similar behaviors to real surface plasmon polariton (SPPs) have also been widely studied and applied to design transmission lines [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A Horizontally Polarized Omnidirectional Antenna Based on Spoof Surface Plasmons

et al. 2020

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As an analog of the role of surface plasmons in optical antenna, spoof surface plasmons enable far-field radiation of antenna at microwave frequencies. Here, a plasmonic metamaterial supporting spoof surface plasmons is experimentally demonstrated for horizontally polarized omnidirectional radiation in the microwave region. A simple and intuitive working principle in the spoof surface plasmonic metamaterial design is provided, along with full-wave simulations that agree well with the experimental results. The low profile and compact design with the omnidirectional radiation pattern promises a wide range of applications, such as ceiling antennas, surface-mounted indoor antennas, and automobile antennas in microwave and radio frequencies.

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“…Recently, subwavelength meta-grating (MG) which takes advantage of its planar structure can be conveniently patterned by various methods, and is widely used in versatile spectral design [23][24][25][26][27][28][29][30][31][32][33]. The coupling of incident light to the guided modes in grating waveguide [34] or the coupling between propagating waveguide array modes (WAMs) inside the grating [35] explains the spectral responses such as broadband high reflectance [36][37][38][39][40][41], band-pass [42] and band-stop [43].…”

Section: Introductionmentioning

confidence: 99%

Narrow-frequency sharp-angular filters using all-dielectric cascaded meta-gratings

et al. 2020

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AbstractSelective transmission or filtering always responds to either frequency or incident angle, so as hardly to maximize signal-to-noise ratio in communication, detection and sensing. Here, we propose compact meta-filters of narrow-frequency sharp-angular transmission peak along with broad omnidirectional reflection sidebands, in all-dielectric cascaded subwavelength meta-gratings. The inherent collective resonance of waveguide-array modes and thin film approximation of meta-grating are employed as the design strategy. A unity transmission peak, locating at the incident angle of 44.4° and the center wavelength of 1550 nm, is demonstrated in a silicon meta-filter consisting of two-layer silicon rectangular meta-grating. These findings provide possibilities in cascaded meta-gratings spectroscopic design and alternative utilities for high signal-to-noise ratio applications in focus-free spatial filtering and anti-noise systems in telecommunications.

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High-performance meta-devices based on multilayer meta-atoms: interplay between the number of layers and phase coverage

Cited by 75 publications

References 49 publications

A Tunable Metasurface with Switchable Functionalities: From Perfect Transparency to Perfect Absorption

A Tunable Metasurface with Switchable Functionalities: From Perfect Transparency to Perfect Absorption

A Horizontally Polarized Omnidirectional Antenna Based on Spoof Surface Plasmons

Narrow-frequency sharp-angular filters using all-dielectric cascaded meta-gratings

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