Double-Layer Circuit Analog Absorbers Based on Resistor-Loaded Square-Loop Arrays

Chen, Jianlin; Shang, Yuping; Liao, Cheng

doi:10.1109/lawp.2018.2805333

Cited by 100 publications

(31 citation statements)

References 22 publications

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“…Before moving forward, it is necessary to specify how to implement the reactive layers required by a CA absorber at optical frequencies. At microwaves, such layers can be realized by patterning a lossy material [27,28] or by adding lossy lumped elements to a reactive surface [29]. As to the optical frequencies, we have recently proven that a resistive sheet can be realized using an array of ellipsoidal nanoparticles that are smaller than the mean free path of electrons in the constituent plasmonic material [20].…”

Section: Methodsmentioning

confidence: 99%

The Design of Optical Circuit-Analog Absorbers through Electrically Small Nanoparticles

et al. 2019

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In the last few years, the perfect absorption of light has become an important research topic due to its dramatic impact in photovoltaics, photodetectors, color filters and thermal emitters. While broadband optical absorption is relatively easy to achieve using bulky devices, today there is a strong need and interest in achieving the same effects by employing nanometric structures that are compatible with modern nanophotonic components. In this paper, we propose a general procedure to design broadband nanometer-scale absorbers working in the optical spectrum. The proposed devices, which can be considered an extension to optics of microwave circuit-analog absorbers, consist of several layers containing arrays of elongated nanoparticles, whose dimensions are engineered to control both the absorption level and the operational bandwidth. By combining a surface-impedance homogenization and an equivalent transmission-line formalism, we define a general analytical procedure that can be employed to achieve a final working design. As a relevant example, we show that the proposed approach allows designing an optical absorber exhibiting a 20% fractional bandwidth on a thickness of λ/4 at the central frequency of operation. Full-wave results confirming the effectiveness of the analytical findings, as well as some considerations about the experimental realization of the proposed devices are provided.

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Section: Methodsmentioning

confidence: 99%

The Design of Optical Circuit-Analog Absorbers through Electrically Small Nanoparticles

et al. 2019

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“…In the last decades, a great number of CAAs with good performance have been reported in literatures. They are realized either by printed resistive patterns [29]- [31] or by conductive strips with lumped resistors loading [32]- [34]. However, only part of absorptive FSSs used in literatures can be applied for FSR design.…”

Section: Design Of An Absorbermentioning

confidence: 99%

Miniaturized-Element Frequency-Selective Rasorber Design Using Characteristic Modes Analysis

Guo

et al. 2020

IEEE Trans. Antennas Propagat.

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A dual-polarization frequency-selective rasorber with two absorptive bands at both sides of a passband is presented. Based on the characteristic mode analysis, a circuit analog absorber is designed using a lossy FSS that consists of miniaturized meander lines and lumped resistors. The positions and values of resistors are determined according to the analysis of modal significances and modal current. After that, the presented rasorber is designed by cascading of the lossy FSS and a lossless bandpass FSS. Equivalent circuits of the frequency-selective rasorber are modelled, and surface current distributions of both FSSs are illustrated to explain the operation mechanism. Measurement results show that, under the normal incidence, a minimum insertion loss of 0.27 dB is achieved at a passband around 6 GHz, and the absorption bands with an absorption rate higher than 80% are 2.5 to 4.6 GHz in the lower band and 7.7 to 12 GHz in the higher band, respectively. Our results exhibit good agreements between measurements and simulations.

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“…If the structure is intended to be absorptive, the admittance of the FSS must be capacitive and resistive in order to compensate the transferred admittance and match to the intrinsic admittance of free space. The so‐called discussion is very popular and is mentioned in many references such as References and . Square patch FSS is a very simple candidate as a capacitive admittance .…”

Section: Formulationmentioning

confidence: 99%

Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

Firouzfar

Afsahi

Orouji

2019

Int J RF Microw Comput Aided Eng

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A new procedure is presented to design electromagnetic absorbers based on resistive square patch frequency selective surface (FSS) over grounded dielectric. The periodicity (p) and the distance between two adjacent squares in the lattice (w) are two unknowns to be solved, given the thickness and permittivity of the substrate, surface impedance of the square patches and the desired reflectivity in some specified frequency. Equivalent circuit model and transmission line method are employed here. Previously reported analysis formulas to calculate the square patch FSS admittance are exploited and novel synthesis formulas are extracted based of them. The final synthesis equations to calculate p and w are presented in term of polynomials. Usually an absorber is supposed to have a maximum reflectivity r in a frequency band [f 1 , f 2 ]. The (p, w) pairs for reflectivity less than r in f 1 , define an area in p-w plane. The intersection of the so-called area with the similar one defined by f 2 specifies all possible (p, w) pairs. Finally the results are tested and verified by the commercial full wave simulator Ansys-HFSS as well as some experimental design. There is a good agreement between the expected results with the full wave analysis and practical test. K E Y W O R D S synthesis formulas, equivalent circuit, square patch FSS absorbers

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Double-Layer Circuit Analog Absorbers Based on Resistor-Loaded Square-Loop Arrays

Cited by 100 publications

References 22 publications

The Design of Optical Circuit-Analog Absorbers through Electrically Small Nanoparticles

The Design of Optical Circuit-Analog Absorbers through Electrically Small Nanoparticles

Miniaturized-Element Frequency-Selective Rasorber Design Using Characteristic Modes Analysis

Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

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