Accurate Analysis of Finite-Volume Lumped Elements in Metamaterial Absorber Design

You, Jian Wei; Zhang, Jianfeng; Jiang, Wei; Feng, Hui; Cui, Wan Zhao; Cui, Tie Jun

doi:10.1109/tmtt.2016.2572180

Cited by 25 publications

(10 citation statements)

References 34 publications

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“…9. The waveguide measurement method [13,14] was used to test the absorption performance for its simplicity in measurement process. The proposed structure shows single absorption peak at 12.46 GHz for the lower height of 3.5 mm with double absorption peaks at 11.22 GHz and 15.54 GHz for higher gap of 7.5 mm.…”

Section: Resultsmentioning

confidence: 99%

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Sen¹,

Das²

2018

PIER Letters

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A frequency tunable multi-layer low cost microwave absorber is proposed for Ku and X bands of applications. The tunability is obtained with the cavity model design using two metallic layers; a frequency selective surface (FSS) layer and a metal backed substrate layer with the air gap between them. The change in air-gap results in variation of the effective substrate height, and as a consequence the resonant frequency is tuned. The coupling of LC resonance and cavity resonance at an air-gap of 7.5 mm results in a dual-band absorption of the design. The proposed absorber performance has been analyzed for both TE and TM polarizations of incident wave, and the results are found to be same. The studies on surface current distribution and incident angle variation are observed to get physical insight behind absorption. The waveguide measurement method is used to correlate the simulated results with the measured one. With this simple cost-efficient design, the absorber appears well suited for microwave application at X and Ku bands.

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Section: Resultsmentioning

confidence: 99%

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Sen¹,

Das²

2018

PIER Letters

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“…1b , the metallic material (yellow) is copper and the dielectric substrate (semitransparent gray) is a widely-used commercial PCB board (F4B), whose relative permittivity is 2.65 and loss tangent is 0.001. The PIN diodes (bold pink) are modeled by lumped elements 31 , 41 . The “off” state is modeled by an inductor-capacitor series circuit, where the inductance L = 0.4 nH and the capacitance C = 40 fF.…”

Section: Methodsmentioning

confidence: 99%

Reprogrammable plasmonic topological insulators with ultrafast control

et al. 2021

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Topological photonics has revolutionized our understanding of light propagation, providing a robust way to manipulate light. So far, most of studies in this field are focused on designing a static photonic structure. Developing a dynamic photonic topological platform to switch multiple topological functionalities at ultrafast speed is still a great challenge. Here we theoretically propose and experimentally demonstrate a reprogrammable plasmonic topological insulator, where the topological propagation route can be dynamically changed at nanosecond-level switching time, leading to an experimental demonstration of ultrafast multi-channel optical analog-digital converter. Due to the innovative use of electric switches to implement the programmability of plasmonic topological insulator, each unit cell can be encoded by dynamically controlling its digital plasmonic states while keeping its geometry and material parameters unchanged. Our reprogrammable topological plasmonic platform is fabricated by the printed circuit board technology, making it much more compatible with integrated photoelectric systems. Furthermore, due to its flexible programmability, many photonic topological functionalities can be integrated into this versatile topological platform.

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“…The active element (i.e., the varactoe diode) can be constructed as the lumped element in sources and loads or by employing a simplified finite‐volume lumped element method. [ 52 ]…”

Section: Methodsmentioning

confidence: 99%

Dynamic Controls of Second‐Harmonic Generations in Both Forward and Backward Modes Using Reconfigurable Plasmonic Metawaveguide

Gao

Zhang

et al. 2020

Advanced Optical Materials

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the metal surface because the metals behave as perfectly electric conductors instead of negative-permittivity dielectrics. Therefore, substantial efforts have been made to construct plasmonic metamaterials, which support spoof SPPs (SSPPs) mimicking the properties of the natural SPPs. [2] SSPPs can be implemented by a variety of structures, such as domino plasmonic waveguide, [3] wedge plasmonic waveguide, [4] helically grooved metallic wire, [5] wire converter, [6] channel plasmonic waveguide, [7] and 2D array of holes. [8] Subsequently, an ultrathin and flexible SSPP waveguide has been proposed to achieve the miniaturization and integration of plasmonic devices. [9][10][11][12][13][14][15][16][17][18][19][20][21] Based on this design, the high conversion efficiency between SSPPs and spatial waves has been realized in the microwave frequencies. [22][23][24][25] Compared to the traditional microstrips, the ultrathin SSPP waveguide has distinct advantages such as low loss, low crosstalk, and packaging minimization due to the feature of tight field confinements.The enhanced field intensity feature of SPPs allows for significant enhancement of the nonlinear effects. Various structures, such as L-shaped gold particles, [26] split-ring resonators (SRRs), [27][28][29] gold meta-atom with threefold rotational symmetry, [30] super-thin silver nanowire, [31] G-shaped chiral particles ordered in different ways [32] to introduce a plasmonic gap in waveguide, [33] have been proposed to enhance the second harmonic generations (SHGs). To further improve the conversion efficiency of SHG, a critical phase-matching condition needs to be fulfilled. Recently, a non-centrosymmetric structure has been proposed to satisfy the phase-matching condition, in which the conversion efficiency is two orders higher than the previous work without using the phase matching. [34] At microwave frequencies, the nonlinear process has also been explored in metamaterials and metasurfaces, [35][36][37][38][39] especially in the plasmonic metamaterials. [40][41][42][43][44] In 2011, Smith et al. demonstrated that the quasiphase matching condition can improve the SHG intensity by introducing the nonlinear varactor diodes into the gap of split-ring resonator. [38] However, the above-mentioned nonlinear metasurface is difficult to apply for the integrated communication systems. [38] To realize compact and efficient nonlinear SPP devices, ultrathin Second-harmonic generation (SHG) has recently been explored in plasmonic metamaterials, but real-time tunability of the nonlinear process still remains a challenge and has not been reported. Here, an ultrathin spoof surface plasmon polariton (SSPP) waveguide loaded with varactor diodes is proposed to achieve high conversion efficiencies of SHGs in both forward and backward phase-matching conditions in the same frequency band. The dispersion behaviors of SSPPs can be manipulated by adjusting the capacitance of the varactor diodes loaded on the unit structure, allowing forward and backward phase-matching for both fu...

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Accurate Analysis of Finite-Volume Lumped Elements in Metamaterial Absorber Design

Cited by 25 publications

References 34 publications

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Frequency Tunable Low Cost Microwave Absorber for Emi/Emc Application

Reprogrammable plasmonic topological insulators with ultrafast control

Dynamic Controls of Second‐Harmonic Generations in Both Forward and Backward Modes Using Reconfigurable Plasmonic Metawaveguide

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