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. 

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.

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 Ultrathin Terahertz Dual-Band Perfect Metamaterial Absorber Using Asymmetric Double-Split Rings Resonator

Symmetry ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 293 ◽  
Author(s):  
Taiguo Lu ◽  
Dawei Zhang ◽  
Peizhen Qiu ◽  
Jiqing Lian ◽  
Ming Jing ◽  
...  
Keyword(s):  
Electric Field ◽  
Metal Layer ◽  
Metamaterial Absorber ◽  
Dual Band ◽  
Asymmetric Distribution ◽  
Absorption Frequency ◽  
Terahertz Band ◽  
Perfect Metamaterial Absorber ◽  
Simulation Results ◽  
Continuous Metal

In this article, an ultrathin terahertz dual band metamaterial absorber made up of patterned asymmetrical double-split rings and a continuous metal layer separated by a thin FR-4 layer is designed. Simulation results show that two almost identical strong absorption peaks appear in the terahertz band. When the incident electric field is perpendicular to the ring gaps located at 11 μm asymmetrically, the absorptivity of 98.6% at 4.48 THz and 98.5% at 4.76 THz can be obtained. The absorption frequency and the absorptivity of the absorber can be modulated by the asymmetric distribution of the gaps. The perfect metamaterial absorber is expected to provide important reference for the design of terahertz modulator, filters, absorbers, and polarizers.

scholarly journals Dual-band tunable perfect metamaterial absorber in the THz range

2016 ◽  
Vol 24 (2) ◽  
pp. 1518 ◽  
Author(s):  
Gang Yao ◽  
Furi Ling ◽  
Jin Yue ◽  
Chunya Luo ◽  
Jie Ji ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Perfect Metamaterial Absorber ◽  
Thz Range

scholarly journals Hybrid Metamaterials Perfect Absorber and Sensitive Sensor in Optical Communication Band

2021 ◽  
Vol 9 ◽  
Author(s):  
Xuehan Liu ◽  
Keyang Li ◽  
Zhao Meng ◽  
Zhun Zhang ◽  
Zhongchao Wei
Keyword(s):  
Optical Communication ◽  
Electromagnetic Waves ◽  
Incident Angle ◽  
Silicon Layer ◽  
Resonance Wavelength ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Perfect Absorber ◽  
Perfect Absorption

A subwavelength metamaterial perfect absorber (MPA) in optical communication band was proposed and tested using the finite-difference time-domain method. The absorber is periodic and comprises a top layer of diamond silicon surrounded by L-shaped silicon and a gold layer on the substrate. It can achieve dual-band perfect absorption, and one of the peaks is in the optical communication band. By changing the gap (g) between two adjacent pieces of L-shaped silicon, and the thickness (h) of the silicon layer, the resonance wavelength of absorption peak can be tuned. When the incident electromagnetic wave entered the absorber, the metamaterial absorber could almost completely consume the incident electromagnetic waves, thereby achieving more than 99% perfect absorption. The absorption peak reaches 99.986% at 1310 nm and 99.421% at 1550 nm. Moreover, the MPA exposed to different ambient refraction indexes can be applied as plasma sensors, and can achieve multi-channel absorption with high figure of merit (FOM*) value and refractive index (RI) sensitivity. The FOM* values at 1310 nm and 1550 nm are 6615 and 168, respectively, and both resonance peaks have highly RI sensitivity. The results confirm that the MPA is a dual-band, polarization-independent, wide-angle absorber and insensitive to incident angle. Thence it can be applied in the fields of optical communication, used as a light-wave filter and plasma sensor, and so on.

A Multiple-Bands Metamaterial Absorber Based in X, Ku and K-Band

2021 ◽  
Author(s):  
Muhammad Fahim Zafar ◽  
Usman Masud
Keyword(s):  
Single Layer ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Basic Unit ◽  
Frequency Range ◽  
Structure Form ◽  
Perfect Absorption ◽  
Polarization Insensitive ◽  
Band Absorption ◽  
K Band

Abstract Developing a highly efficient and multiple-bands metamaterial absorber is a hot issue in recent era. In this paper, A multiple-bands metamaterial absorber has been presented which is based in X, Ku and K-band. Firstly, we have designed two single layer basic unit cell of X-shape and cross-shape, then they are arranged in the multi-layers structure form for the purpose of obtaining multiple- bands and wide band absorption. The proposed absorber is able to work in multiple bands because it has six peaks in the frequency range of 8–24 GHz with having near perfect absorption. Moreover, the sixth peak has a wideband absorption which is 2.93 GHz. Furthermore, the proposed absorber is also tested for polarization insensitivity and also for oblique incidence. Absorption was found polarization insensitive with almost perfect absorption.

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.

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