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Search Results (3)

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Keywords = optical stealth transmission

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13 pages, 9356 KiB  
Article
Optically Reconfigurable THz Metamaterial with Switchable Wideband Absorption and Transmission
by Liansheng Wang, Qingge Li, Quanhong Fu, Xueyong Ding, Yuan Wang and Weiren Zhu
Photonics 2023, 10(11), 1253; https://doi.org/10.3390/photonics10111253 - 13 Nov 2023
Cited by 4 | Viewed by 1605
Abstract
We present an optically reconfigurable multifunctional metamaterial with switchable wideband absorption and transmission across the THz frequency range. The reconfigurability is achieved by introducing optically active silicon into the resonator of the metamaterial unit which could be effectively modulated through external electrical pumping. [...] Read more.
We present an optically reconfigurable multifunctional metamaterial with switchable wideband absorption and transmission across the THz frequency range. The reconfigurability is achieved by introducing optically active silicon into the resonator of the metamaterial unit which could be effectively modulated through external electrical pumping. When the silicon conductivity reaches 50,000 S/m, the metamaterial shows significant absorption of electromagnetic waves ranging from 3.1 to 10 THz. By reducing the applied external pump power and decreasing the silicon conductivity to 150 S/m, the proposed metamaterial exhibits transmission of the incident waves at 5.12 THz with a transmission coefficient of 61%. The proposed optically reconfigurable metamaterial has the advantages of simple structure, wideband absorption, and switchable between absorption and transmission modes, showing potential applications in stealth, communication, or radar systems. Full article
(This article belongs to the Special Issue Development and Application of Metalenses)
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13 pages, 3602 KiB  
Article
Design of an Ultra-Wideband Transparent Wave Absorber
by Huijuan Dai, Shuying Li, Peng Dong and Yanqin Ma
Materials 2023, 16(17), 5962; https://doi.org/10.3390/ma16175962 - 31 Aug 2023
Cited by 8 | Viewed by 1923
Abstract
In this paper, a multilayer ultra-wideband transparent metamaterial wave absorber is proposed, which has the characteristics of ultra-wideband wave absorption, light transmission and flexible bending; in addition, due to the complete symmetry of the structure, the absorber has polarization insensitivity to incident electromagnetic [...] Read more.
In this paper, a multilayer ultra-wideband transparent metamaterial wave absorber is proposed, which has the characteristics of ultra-wideband wave absorption, light transmission and flexible bending; in addition, due to the complete symmetry of the structure, the absorber has polarization insensitivity to incident electromagnetic waves. Both simulation and experimental results show that the frequency range of the microwave absorption rate is higher than 90% between 8.7 GHz and 38.9 GHz (between which most of the absorption rate can reach more than 95%), the total bandwidth is 30.2 GHz, and the relative bandwidth is 126.9%, realizing microwave broadband absorption and covering commonly used communication frequency bands such as X-band, Ku-band, and K-band. A sample was processed and tested. The test results are in good agreement with the results of the theoretical analysis, which proves the correctness of the theoretical analysis. In addition, through the selection and oxidation of indium tin (ITO) materials, the metamaterial also has the characteristics of optical transparency and flexibility, so it has potential application value in the window radar stealth and conformal radar stealth of weapons and equipment. Full article
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10 pages, 3868 KiB  
Communication
Effect of Laser Parameters on Optical Stealth Transmission System Performance
by Xinmei Wang, Weifeng Mou and Huatao Zhu
Sensors 2021, 21(16), 5358; https://doi.org/10.3390/s21165358 - 9 Aug 2021
Cited by 5 | Viewed by 2176
Abstract
The performance of an optical stealth transmission system based on gain-switched laser depends largely on the laser parameters. Modulation frequency, bias current, and modulation current are considered to study the covertness and bit error rate performance of the optical stealth transmission system. According [...] Read more.
The performance of an optical stealth transmission system based on gain-switched laser depends largely on the laser parameters. Modulation frequency, bias current, and modulation current are considered to study the covertness and bit error rate performance of the optical stealth transmission system. According to optical stealth carrier generation with time spreading and all-optical encoding, the stealth signals are derived. A complementary encoding scheme is adopted in the system simulation. The simulation results show that the temporal and spectral characteristics of the generated stealth signal can be changed by adjusting the bias current, modulation current, and modulation frequency. However, there is a trade-off between bit error rate performance and covertness of the stealth channel. Under the premise of error-free transmission, the bias current and modulation frequency should be reduced and the modulation current should be improved to optimize the covertness of the stealth channel. Full article
(This article belongs to the Special Issue Fiber Optical Communication and Sensing Systems)
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