A Simple Multi-band Metamaterial Absorber with Combined Polarization Sensitive and Polarization Insensitive Characteristics for Terahertz Applications

Appasani, Bhargav; Prince, Pallav; Ranjan, Rajeev Kumar; Gupta, Nisha; Verma, Vijay

doi:10.1007/s11468-018-0852-x

Cited by 39 publications

(11 citation statements)

References 21 publications

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“…These absorbers operate in the GHz and MHz frequency regimes. Metamaterial absorbers in the terahertz regime can be created with proper scaling and by proper choice of design materials [7,8]. Terahertz metamaterial absorbers (TMA) can also function as extremely high-quality sensors [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Triple Band Highly Sensitive Refractive Index Sensor Using Terahertz Metamaterial Perfect Absorber

Banerjee¹,

Dutta²,

Jha³

et al. 2022

PIER M

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This research introduces a novel design of a metamaterial absorber having the range in terahertz, capable of sensing changes in the refractive index of the encircling medium. The layout includes adjoining rectangular patches in the form of a plus symbol along with four circular patch resonators (CPRs) on the pinnacle of a Gallium Arsenide (GaAs) substrate. The proposed design comes up with three consecutive absorption peaks, with an absorptivity of 99.0%, 99.75%, and 98.0% at three different resonant frequencies of 2.36 THz, 2.675 THz, and 2.97 THz, respectively, and a Full Width Half Maximum (FWHM) of 0.08, 0.04, and 0.05. This structure's quality factor (Q-factor) at the three resonant frequencies is 29.5, 66.8, and 59.4 together with 6.75, 17.5, and 30 as figure of merit (FoM), respectively. The proposed design offers a sensitivity of 0.54 THz/RIU, 0.7 THz/RIU, and 1.5 THz/RIU in those three absorption bands. To support the selection of design parameters, parametric assessment was done. The designed sensor can find its applications in terahertz sensing.

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Section: Introductionmentioning

confidence: 99%

A Triple Band Highly Sensitive Refractive Index Sensor Using Terahertz Metamaterial Perfect Absorber

Banerjee¹,

Dutta²,

Jha³

et al. 2022

PIER M

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“…Among these components, metamaterial absorbers (MAs), which tend to be lightweight and thin, have attracted a lot of attention. Since the first perfect MA was presented by Landy et al [14], different types of absorbers that enable single-band [6,15], multi-band [16][17][18], or broad-band absorption [5,[19][20][21][22][23][24], have been proposed. Metals are most commonly used for the resonance patterns and reflective grounds in most of the reported MAs.…”

Section: Introductionmentioning

confidence: 99%

An ultra-broadband and optically transparent metamaterial absorber based on multilayer indium-tin-oxide structure

Deng¹,

Lv²,

Sun³

et al. 2021

J. Phys. D: Appl. Phys.

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In this work, an ultra-broadband and polarization-insensitive metamaterial absorber (MA) with high optical transparency is presented. Indium-tin-oxide (ITO) films are used as frequency selective surfaces in multiple conductive layers and also as the reflective backplane. Numerical simulation analysis demonstrates that the absorptivity of the proposed absorber exceeds 90% in the frequency range from 10 to 75.5 GHz, corresponding to a relative absorption bandwidth of 153%. The proposed structure has a total thickness of 2.9 mm, which is approximately 1/10 of the free space wavelength of its lowest operating frequency. The absorber also has good polarization insensitivity due to its symmetric geometry. Moreover, for TE-polarized waves, the proposed absorber can maintain an absorptivity greater than 70% for frequencies ranging from 10 to 80 GHz as the incident angle is increased to 45°. For TM-polarized waves, it provides absorptivity of more than 80% at incident angles up to 60°. Surface current distribution on each conductive ITO layer was simulated to analyze the absorption mechanism of the MA. A prototype composed of 16 × 16 unit cells was fabricated and the experimental results show a good agreement with the numerical simulations. Due to its ultra-wideband absorption and wide-incident-angle stability, the proposed MA has potential value in electromagnetic applications such as optically transparent EM shielding and microwave radiation protection.

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“…The design of these structures has evolved into a major research area due to their countless applications in various frequency bands [3,4]. In particular, metamaterial absorbers in the terahertz spectrum or terahertz metamaterial absorbers (TMAs) have tremendous applications in biomedical sensing and biomedical imaging [5,6]. T. J.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Terahertz Metamaterial Absorber Structure with a High Quality Factor Using Two Circular Ring Resonators for Biomedical Sensing

et al. 2021

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Metamaterial absorbers, on account of their inherent property of electromagnetic radiation absorption, have become a center of attraction for many researchers in recent times. This paper proposes a unique design of a terahertz metamaterial absorber that can be used to sense biomedical samples. The proposed design consists of two identical circular ring resonators (CRRs) made of aluminum on top of a gallium arsenide (GaAs) substrate. On account of its high field confinement in the sensing regime, a near-to-perfect absorption rate of 99.50% is achieved at a frequency of 2.64 THz, along with a large quality factor (Q-Factor) of 44. The design is highly sensitive to the refractive index changes in the encompassing medium. Hence, the proposed absorber can be used as a refractive index sensor exhibiting a reasonable sensitivity of 1500 GHz/RIU and a figure of merit (FoM) of 25. The refractive index range has been varied in the range of 1.34 to 1.39. As many biomedical samples, including cancerous cells, reside within this range, the proposed sensor can be used for biomedical sensing applications.

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A Simple Multi-band Metamaterial Absorber with Combined Polarization Sensitive and Polarization Insensitive Characteristics for Terahertz Applications

Cited by 39 publications

References 21 publications

A Triple Band Highly Sensitive Refractive Index Sensor Using Terahertz Metamaterial Perfect Absorber

A Triple Band Highly Sensitive Refractive Index Sensor Using Terahertz Metamaterial Perfect Absorber

An ultra-broadband and optically transparent metamaterial absorber based on multilayer indium-tin-oxide structure

A Theoretical Terahertz Metamaterial Absorber Structure with a High Quality Factor Using Two Circular Ring Resonators for Biomedical Sensing

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