Transmission line model and fields analysis of metamaterial absorber in the terahertz band

Wen, Qiye; Xie, Yuee; Zhang, Huaiwu; Yang, Qinghui; Li, Yuanxun; Liu, Yingli

doi:10.1364/oe.17.020256

Cited by 118 publications

(56 citation statements)

References 21 publications

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“…Absorption models predict a reduction in absorption amplitude when the dielectric layer is thicker than the optimal value. 16,28,29 No reduction in absorption amplitude was observed for increased thickness in this range, suggesting that all absorbers described have an optimal thickness at or above 1.66 μm. It is important to keep the dielectric layer as thin as possible when using metamaterials for thermal sensor applications to reduce thermal capacitance, and thus increase the detector's speed of operation.…”

Section: Metamaterials With a Single Absorption Peakmentioning

confidence: 82%

“…Resonant absorption frequency (ν) and absorption magnitude can be understood using explanations such as impedance-matching to free space, 27 an equivalent resistor inductor capacitor (RLC) circuit, 12,14 confined TM cavity modes, 16 interference of multiple reflections, 28 and transmission lines. 29 The relatively complex nature of metamaterial structures makes numerical simulations generally the preferred modeling method.…”

Section: Introductionmentioning

confidence: 99%

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Al/SiOx/Al single and multiband metamaterial absorbers for terahertz sensor applications

et al. 2013

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Abstract. To increase the sensitivity of uncooled thermal sensors in the terahertz (THz) spectral range (1 to 10 THz), we investigated thin metamaterial layers exhibiting resonant absorption in this region. These metamaterial films are comprised of periodic arrays of aluminum (Al) squares and an Al ground plane separated by a thin silicon-rich silicon oxide (SiO x ) dielectric film. These standard MEMS materials are also suitable for fabrication of bi-material and microbolometer thermal sensors. Using SiO x instead of SiO 2 reduced the residual stress of the metamaterial film. Finite element simulations were performed to establish the design criteria for very thin films with high absorption and spectral tunability. Single-band structures with varying SiO x thicknesses, square size, and periodicity were fabricated and found to absorb nearly 100% at the designed frequencies between three and eight THz. Multiband absorbing structures were fabricated with two or three distinct peaks or a single-broad absorption band. Experimental results indicate that is possible to design very efficient thin THz absorbing films to match specific applications.

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Section: Metamaterials With a Single Absorption Peakmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Al/SiOx/Al single and multiband metamaterial absorbers for terahertz sensor applications

et al. 2013

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“…[11][12][13][14]. Due to the complexity of such structures and their periodic nature, finite element (FE) modeling is the preferable means of designing metamaterials.…”

Section: Figure 1 Terahertz Radiation Within the Electromagnetic Spementioning

confidence: 99%

Metamaterial Resonant Absorbers for Terahertz Sensing

Stinson¹

2015

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188) Washington, DC 20503. AGENCY USE ONLY (Leave blank) REPORT DATEDecember 2015 REPORT TYPE AND DATES COVERED 12a. DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution is unlimited 12b. DISTRIBUTION CODE ABSTRACT (maximum 200 words)The aim of this work is to develop a metamaterial absorber that can be incorporated into a terahertz (THz) imaging system with a 4.7 THz quantum cascade laser (QCL) illumination source. Finite element (FE) simulations were utilized to design metamaterials, and a Fourier transform infrared spectrometer (FTIR) was employed to characterize the absorption spectrum of each metamaterial configuration. Process parameters for future work with the microfabrication devices have been established for the Naval Postgraduate School clean room. Analysis of experimental data provided insight in determining the refractive index of the metamaterial dielectric, SiO x , from 3-8 THz and confirmed the Lorentzian shape for the absorption spectrum as theoretically proposed by another group. Future work will incorporate the metamaterial absorber design of this research into a more efficient, cost effective, bi-material THz sensor that can be employed in a variety of naval applications. SUBJECT TERMS

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“…analyzed the absorption mechanism of MMA by using transmission line theory and equivalent circuit models. [13][14][15] The metamaterial resonator combined with ground plane are firstly considered as a resistance-inductance-capacitance (RLC) model, and then the reflection and transmission characteristics are analyzed by using transmission theory. However, it is still far from understanding the intrinsic absorbing mechanism.…”

Section: Introductionmentioning

confidence: 99%

Analysis of metamaterial absorber in normal and oblique incidence by using interference theory

et al. 2013

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Metamaterial absorber (MMA), which is a kind of thin electromagnetic absorber consisting of sub-wavelength metamaterial resonators and can exhibit near-perfect absorption characteristics, has been widely investigated in recently years. The impedance matching theory was proposed to analyze the configuration of MMA in most literatures. Such theory, however, may not suitable to analyze the interactions of metamaterial resonators and the ground plane. The interference theory, on another hand, can play effective approach for this kind of problem presented in recent studies, whereas little attention has been paid on the oblique incidence conditions. In this paper, we firstly extend the interference theory model to make it applicable for oblique incident waves and analyze MMA using the extended interference theory model. Secondly, we further explore the sufficient condition for the maximum absorptivity at both normal and oblique incidence cases. Thirdly, with the sufficient condition, we can obtain the absorbing frequency directly if the thickness of MMA is given. These theoretical results have significant effects on the design and analyze of MMA. And lastly, we point out that absorptivity is not absolutely insensitive to the incidence angle in TM mode as what previous study claims, but insensitive when the dielectric slab is high loss, which can also be explained by interference theory

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Transmission line model and fields analysis of metamaterial absorber in the terahertz band

Cited by 118 publications

References 21 publications

Al/SiOx/Al single and multiband metamaterial absorbers for terahertz sensor applications

Al/SiOx/Al single and multiband metamaterial absorbers for terahertz sensor applications

Metamaterial Resonant Absorbers for Terahertz Sensing

Analysis of metamaterial absorber in normal and oblique incidence by using interference theory

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