Numerical investigation of the tunable polarizer using gold array and graphene metamaterial structure for an infrared frequency range

2022 ◽  
Vol 128 (1) ◽  
Author(s):  
Vishal Sorathiya ◽  
Sunil Lavadiya ◽  
Bijrajsinh Parmar ◽  
Sudipta Das ◽  
Murali Krishna ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Frequency Range ◽  
Metamaterial Structure ◽  
Infrared Frequency Range

scholarly journals METAMATERIAL-BASED SENSOR DESIGN WORKING IN INFRARED FREQUENCY RANGE

2011 ◽  
Vol 34 ◽  
pp. 205-223 ◽  
Author(s):  
Luigi La Spada ◽  
Filiberto Bilotti ◽  
Lucio Vegni
Keyword(s):  
Sensor Design ◽  
Frequency Range ◽  
Infrared Frequency Range

Tunable and switchable resonance in optically-controlled nested metamaterials at terahertz frequencies

2016 ◽  
Vol 30 (03) ◽  
pp. 1650011
Author(s):  
Yong-Li Che ◽  
Xiao-Long Cao ◽  
Jian-Quan Yao
Keyword(s):  
Gallium Arsenide ◽  
Quartz Substrate ◽  
Optical Excitation ◽  
Ring Resonators ◽  
Metallic State ◽  
Frequency Range ◽  
Metamaterial Structure ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Terahertz Frequencies

The asymmetrical nested metamaterial, composed of two split-ring resonators (SRRs) and two embedded gallium arsenide (GaAs) islands placed in the two SRRs, has been elaborately designed on quartz substrate. Its tunable and switchable resonances at terahertz (THz) frequencies are numerically demonstrated here based on different conductivities of GaAs, which can be transformed from semiconductor to metallic state through appropriate optical excitation. Without photoexcitation, our designed metamaterial has three resonance peaks in the range of monitored frequency range, and they are located at 0.813, 1.269 and 1.722 THz, respectively. As the conductivity of the two GaAs islands increases, different new resonances appear and constantly strengthen. Finally, four new resonant points are generated, at 0.432, 0.948, 1.578 and 1.875 THz, respectively. At the same time, the metamaterial structure is changed from the original nested mode to a new integral mode. Applying reversible changing conductivity of semiconductor to push the conversion of resonance, this asymmetrical nested design provides a new instance in application and development of additional THz devices.

scholarly journals Entire X-band region metamaterial absorber and reflector with a microstrip patch switch for X-band applications

2019 ◽  
Vol 15 (3) ◽  
pp. 1452
Author(s):  
M.M. Gajibo ◽  
M. K. A. Rahim ◽  
N. A. Murad ◽  
O. Ayop ◽  
H.A. Majid ◽  
...  
Keyword(s):  
Wide Band ◽  
Metamaterial Absorber ◽  
Frequency Range ◽  
Metamaterial Structure ◽  
Band Frequency ◽  
Microstrip Patch ◽  
Band Region ◽  
X Band

<span>A metamaterial structure capable of operating as a wide band absorber as well as an AMC reflector is presented in this report. A microstrip patch copper was used as a switch to switch between the two modes. An FR4 substrate was used and the incidental wave angles were varied from 0<sup>0</sup> to 60<sup>0</sup>. Simulations results showed that the absorber was able achieve 96% absorption at 13.05 GHz and 100% absorption at 10.00 GHz and 12.00 GHz. Furthermore, it archived over 85% absorption for the entire X-band frequency range. The AMC reflector also was able to achieve 84.97%, 82.88% and 78.69% for incident angles 0<sup>0</sup>, 20<sup>0 </sup>and 40<sup>0</sup> respectively. Unfortunately, the structure is polarization sensitive.</span>

scholarly journals High-Temperature and Low-Frequency Acoustic Energy Absorption by a Novel Porous Metamaterial Structure

2021 ◽  
Author(s):  
Qihang Liu ◽  
Xuewei Liu ◽  
Chuanzeng Zhang ◽  
Fengxian Xin
Keyword(s):  
High Temperature ◽  
Theoretical Model ◽  
Porous Material ◽  
Energy Absorption ◽  
Low Frequency ◽  
Acoustic Energy ◽  
Frequency Range ◽  
Metamaterial Structure ◽  
Equivalent Inclusion ◽  
Absorption Performance

AbstractIn this paper, we propose a novel porous metamaterial structure with an improved acoustic energy absorption performance at high-temperature and in the low-frequency range. In the proposed novel porous metamaterial structure, a porous material matrix containing periodically perforated cylindrical holes arranged in a triangular lattice pattern is applied, and additional interlayers of another porous material are introduced around these perforations. The theoretical model is established by adopting the double porosity theory for the interlayer and the cylindrical hole which form an equivalent inclusion and then applying the homogenization method to the porous metamaterial structure formed by the equivalent inclusion and the porous matrix. The temperature-dependent air and material parameters are considered in the extended theoretical model, which is validated by the finite element results obtained by COMSOL Multiphysics. The acoustic or sound energy absorption performance can be improved remarkably at very low frequencies and high temperature. Furthermore, the underlying acoustic energy absorption mechanism inside the unit-cell is investigated by analyzing the distribution of the time-averaged acoustic power dissipation density and the energy dissipation ratio of each constituent porous material. The results reveal that regardless of the temperature, the acoustic energy is mostly dissipated in the porous material with a lower airflow resistivity, while the acoustic energy dissipated in the porous material with a higher airflow resistivity also becomes considerable in the high-frequency range. The novel porous metamaterial structure proposed in this paper can be efficiently utilized to improve the acoustic energy absorption performance at high temperature.

Numerical Investigation and Experimental Demonstration of Chaos from Two-Stage Colpitts Oscillator in the Ultrahigh Frequency Range

2006 ◽  
Vol 44 (1-4) ◽  
pp. 167-172 ◽  
Author(s):  
S. Bumelienė ◽  
A. Tamaševičius ◽  
G. Mykolaitis ◽  
A. Baziliauskas ◽  
E. Lindberg
Keyword(s):  
Numerical Investigation ◽  
Ultrahigh Frequency ◽  
Experimental Demonstration ◽  
Frequency Range ◽  
Colpitts Oscillator ◽  
Two Stage

scholarly journals Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range

2017 ◽  
Vol 7 (6) ◽  
pp. 2942
Author(s):  
B. A. F. Esmail ◽  
H. A. Majid ◽  
Z. Z. Abidin ◽  
S. H. Dahlan ◽  
M. K. A. Rahim
Keyword(s):  
Millimeter Wave ◽  
Unit Cell ◽  
Wave Frequency ◽  
Front Face ◽  
Strip Line ◽  
Frequency Range ◽  
Metamaterial Structure ◽  
Transmission Coefficients ◽  
Fifth Generation ◽  
Beam Switching

In this paper, reconfigurable metamaterial structure at millimeter wave frequency range was designed and simulated for a future fifth generation (5G) mobile-phone beam switching applications. The new proposed structure was composed of a bridge-shaped resonator (BSR) in the front face and strip line at the back face of the unit cell which operates at 28 GHz. First, non-reconfigurable low loss BSR unit cell was designed and subsequently, the reconfigurability was achieved using four switches formed in the gaps of the structure. The proposed structure achieves the lowest loss and almost full transmission among its counterparts by -0.06 dB (0.99 in linear scale). To demonstrate the reconfigurability of the metamaterial, the reflection and transmission coefficients and real parts of the effective refractive index at each reconfigured frequency were studied and investigated. Simulation results showed that a high transmission and reflection peaks occur at each resonance frequency according to change the state of the switches.

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