A thermally tunable terahertz three-dimensional perfect metamaterial absorber for temperature sensing application

2020 ◽  
Vol 34 (18) ◽  
pp. 2050207 ◽  
Author(s):  
Haijun Zou ◽  
Yongzhi Cheng
Keyword(s):  
Indium Antimonide ◽  
Cell Structure ◽  
Three Dimensional ◽  
Metamaterial Absorber ◽  
Temperature Sensing ◽  
Perfect Absorption ◽  
External Temperature ◽  
Absorption Frequency ◽  
Perfect Metamaterial Absorber ◽  
Sensing Application

We present a three-dimensional (3D) perfect metamaterial absorber (PMA) for temperature sensing application in terahertz region. The PMA consists of a 3D metal resonator structure array and a continuous metal film separated by an indium antimonide (InSb) layer. The numerical simulations demonstrate that the PMA can achieve perfect absorption (about 99.9%) with the high [Formula: see text]-factor of about 18.8 at 2.323 THz when the temperature is 300 K (room temperature). Further simulation results indicate that this terahertz PMA is polarization-insensitive and wide-angle for both transverse electric (TE) and transverse magnetic (TM) waves. The electric field and surface current distributions of the unit-cell structure indicate that the perfect absorption is originated from the excitation of the fundamental magnetic and electric dipole resonance mode. Since the permittivity of the InSb is sensitive to the external temperature, the resonance absorption frequency of the PMA can be dynamically adjusted. The temperature sensitivity of the PMA is about 15.24 GHz/K, which may have potential prospects in temperature sensing and detection.

scholarly journals Two-layered Dual-band Perfect Metamaterial Absorber at K band Frequency

2018 ◽  
Vol 7 (2) ◽  
pp. 25-27
Author(s):  
M. C. Tran ◽  
T. T. H. Phuong
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Material Structure ◽  
Perfect Absorption ◽  
Band Frequency ◽  
Absorption Frequency ◽  
Dielectric Layers ◽  
Absorber Structure ◽  
Perfect Metamaterial Absorber ◽  
K Band

This paper presents a study of a novel absorber structure based on two-dielectric-layers, two perfect absorption frequency bands at K band (f1 = 26.5 GHz and f2 = 28.6 GHz) go under observance. The study of the dependence of absorption and frequency on relative distance between the layers of material and the material structure parameters are discussed. 

Quarter mode rectangular cavity-based perfect metamaterial absorber in the terahertz region

2019 ◽  
Vol 33 (36) ◽  
pp. 1950460 ◽  
Author(s):  
Xiaojie Lu ◽  
Zhongyin Xiao ◽  
Mingming Chen
Keyword(s):  
Normal Incidence ◽  
Wave Theory ◽  
Metamaterial Absorber ◽  
Metal Plate ◽  
Rectangular Cavity ◽  
Perfect Absorption ◽  
Analysis And Design ◽  
Terahertz Region ◽  
Perfect Metamaterial Absorber ◽  
Good Agreement

In this work, we present the analysis and design of a perfect metamaterial absorber (MA) based on quarter mode rectangular cavity in the terahertz region. This structure is consisted of a metal plate where three different size quarter mode rectangular cavities are vertically placed on. Based on rectangular-cavity-theory, a formula is proposed to calculate the resonant frequency, which provides a guidance for designing MAs of such type. In terms of normal incidence, the simulated results show that the MA has three resonance points on 4.1301 THz, 4.6051 THz and 5.1088 THz, respectively, which is in good agreement with the calculated results. Furthermore, we present the distribution of E-field in the cavity and use the standing wave theory to explain the physical mechanism of the perfect absorption. These results verify the application of resonant cavities in the field of MA.

Polarization angle independent metamaterial absorber based on circle-shaped resonators with interference theory

2015 ◽  
Vol 29 (30) ◽  
pp. 1550188
Author(s):  
Furkan Dincer ◽  
Muharrrem Karaaslan ◽  
Oguzhan Akgol ◽  
Emin Unal ◽  
Cumali Sabah
Keyword(s):  
Wide Band ◽  
Metamaterial Absorber ◽  
Polarization Angle ◽  
Absorption Mechanism ◽  
Perfect Absorption ◽  
Microwave Frequencies ◽  
Simple Geometry ◽  
Absorber Structure ◽  
Perfect Metamaterial Absorber ◽  
Source Wave

We theoretically and numerically designed a perfect metamaterial absorber at microwave frequencies. The proposed design has a very simple geometry, wide band properties and provides perfect absorption for all polarization angles which is one of the most desired properties for an absorber structure to be used in the applications where the source polarization is unknown. In order to explain the absorption mechanism both numerical and theoretical analyses are carried out. Designed structure offers a perfect absorption at around 9.8 GHz. The resonance frequency does not change depending on the source wave polarization. In addition, it can be easily reconfigured for THz and infrared regimes for different applications such as sensors, defense systems and stealth technologies.

scholarly journals An Ultrathin, Triple-Band Metamaterial Absorber with Wide-Incident-Angle Stability for Conformal Applications at X and Ku Frequency Band

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Guangsheng Deng ◽  
Kun Lv ◽  
Hanxiao Sun ◽  
Jun Yang ◽  
Zhiping Yin ◽  
...  
Keyword(s):  
Free Space ◽  
High Efficiency ◽  
Incident Angle ◽  
Surface Current ◽  
Normal Incidence ◽  
Metamaterial Absorber ◽  
Angle Of Incidence ◽  
Perfect Absorption ◽  
Absorption Frequency ◽  
Unit Cells

AbstractAn ultrathin and flexible metamaterial absorber (MA) with triple absorption peaks is presented in this paper. The proposed absorber has been designed in such a way that three absorption peaks are located at 8.5, 13.5, and 17 GHz (X and Ku bands) with absorption of 99.9%, 99.5%, and 99.9%, respectively. The proposed structure is only 0.4 mm thick, which is approximately 1/88, 1/55, and 1/44 for the respective free space wavelengths of absorption frequency in various bands. The MA is also insensitive due to its symmetric geometry. In addition, the proposed structure exhibits minimum 86% absorption (TE incidence) within 60° angle of incidence. For TM incidence, the proposed absorber exhibits more than 99% absorptivity up to 60° incidence. Surface current and electric field distributions were investigated to analyze the mechanism governing absorption. Parameter analyses were performed for absorption optimization. Moreover, the performance of the MA was experimentally demonstrated in free space on a sample under test with 20 × 30 unit cells fabricated on a flexible dielectric. Under normal incidence, the fabricated MA exhibits near perfect absorption at each absorption peak for all polarization angles, and the experimental results were found to be consistent with simulation results. Due to its advantages of high-efficiency absorption over a broad range of incidence angles, the proposed absorber can be used in energy harvesting and electromagnetic shielding.

scholarly journals Stereo Perfect Metamaterial Absorber Based on Standing Gear-Shaped Resonant Structure With Wide-Incident-Angle Stability

2020 ◽  
Vol 8 ◽  
Author(s):  
Guangsheng Deng ◽  
Kun Lv ◽  
Hanxiao Sun ◽  
Zhiping Yin ◽  
Jun Yang
Keyword(s):  
Incident Angle ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Center Frequency ◽  
Resonant Structure ◽  
Potential Applications ◽  
Angle Stability ◽  
Perfect Metamaterial Absorber

In this work, a single-band metamaterial absorber (MA) based on a three dimensional (3D) resonant structure is presented. The unit cell is composed of a standing gear-shaped resonator, which is embedded in the dielectric substrate. The proposed 3D MA is ultrathin with a total thickness of 2.3 mm, corresponding 0.077λ0 at its center frequency. The simulation results demonstrate a high absorption peak at 10.1 GHz with absorptivity of 99.9%. The proposed 3D MA is insensitive to the polarization of the incident wave due to its rotationally symmetric structure. Moreover, the proposed 3D MA exhibits a wide-incident-angle stability, as absorptivity of more than 85% can be achieved for both TE and TM incidences with incident angle up to 60°. Most importantly, multiband electromagnetic wave absorption of the stereo MA can be enabled by adjusting the structural parameters of the standing gear. The proposed structure is compatible with 3D printing technology and has potential applications in electromagnetic shielding.

scholarly journals Ultrathin polarization-insensitive tri-band THz perfect metamaterial absorber

2020 ◽  
Vol 7 ◽  
pp. 2
Author(s):  
Zhaomei Liu ◽  
Xingxing Han ◽  
Aixia Wang
Keyword(s):  
Cell Structure ◽  
Metamaterial Absorber ◽  
Q Factor ◽  
Simulated Spectrum ◽  
Thz Imaging ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Perfect Metamaterial Absorber ◽  
Sandwiched Structure ◽  
Patch Resonators

In this paper, an ultrathin and polarization-insensitive THz perfect metamaterial absorber (PMA) was proposed using the traditional sandwiched structure with circular patch resonators on the top layer. The simulated spectrum shows that the proposed PMA has three distinctive absorption peaks at f1 = 0.8 THz, f2 = 2.28 THz and f3 = 3.62 THz, with absorbance of 96.7%, 97.9% and 99.8%, respectively. The electric field distributions of the PMA reveal that the absorption mainly originates from the standing wave resonances between the top and bottom layers. The proposed PMA is polarization insensitive due to its axisymmetric unit cell structure. By adjusting the structure parameters, the resonance frequency, intensity and Q-factor of absorption peak can be tuned effectively. Our design may find potential applications in THz imaging, sensing and signal detection.

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