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The results reveal that when the conductivity of vanadium dioxide is less than 8. 5 percent = 103 S/M, the absorption can be adjusted between 2% and 100%. The absorption bandwidth of the absorber can be changed from 3. 4 THz to 2. 83 THz and none, respectively, with the absorption percentage remaining above 90%. Impedance matching theory and electric field distribution have clarified the physical anatomy of dual-broadband absorption and perfect absorption. The absorber can be used in emerging fields such as modulators, stealth, and light-guided optical switches.
Source link: https://doi.org/10.3390/nano12101731
The simulated absorption spectrum shows that the average thickness of the integrated absorber, 8. 9 mm, is in the deep subwavelength range and close to the causal minimum thickness of 8. 2 mm that is determined from the simulated absorption spectrum. The woven composite is a new form of acoustic metamaterials with a high acoustic energy density and broad underwater applications.
Source link: https://doi.org/10.1126/sciadv.abm4206
What will happen if metamaterial structures meet functional materials? The recent emergence of metamaterial structures and functional materials in conjunction with functional materials has opened new possibilities for dynamic manipulation of the terahertz wave. Functional materials' optical responses are greatly enhanced due to the highly localized structures in metamaterials', and metamaterials' properties can in turn be adjusted in a wide dynamic range, depending on external stimulation. Under various external stimulations, we investigate the dynamic tunable metamaterial structures based on the combination of functional materials such as graphene, vanadium dioxide, and Dirac semimetal.
Source link: https://doi.org/10.3390/photonics9050335
For arrays of 16 to 128 antennas, fifth generation communication networks employ a massive MIMO scheme to add gain and spatial multiplexing. The number of required meander lines to design the absorber is delineated in an analytical framework that is used to determine the total number of required meander lines to design the absorber is determined. The analytical model is based on the total inductance provided by the meander line assembly in an impedance-matched electronic circuit. The newest absorber is based on resonance's main principle and absorbs two 5G bands. Before experiments for both transverse electric and transverse magnetic polarizations, a complete angular stability analysis was carried out. Since elements are located in close proximity to compact 5G systems, a comparison of simulated and measured results indicates that such an absorber would be a good candidate for absorption in millimetre-wave array antennas.
Source link: https://doi.org/10.3390/s22103764
The first two absorption peaks are linked to the physical mechanism of these peaks, according to the study, the first two absorption peaks result from the dipole resonance of the inner two splitting arcs and the outer pair of split arcs, respectively, while the last absorption peak is caused by surface propagation resonance of the surface patterned resonator. Structure parameters, including the dimensions of splitting arcs and the spacing between two pairs of split arcs, are all further investigated.
Source link: https://doi.org/10.1142/s0217984922500762
Abstract A broadband metamaterial absorber with optical transmittance characteristics was created to handle gigahertz's electromagnetic pollution. Polymethyl methacrylate with a periodic arrayed indium tin oxide film and a low-resistivity ITO reflective layer is the intended MMA with high optical transmission polymeterization polymethyl methacrylate. The well-known microwave absorption and optical transmittance properties show that the MMA has a strong potential for producing optical transmittance microwave absorption windows and accessories.
Source link: https://doi.org/10.21203/rs.3.rs-1565214/v1
Metamaterials are an excellent platform for enhanced light–matter interaction in a wide range of frequencies due to their resonant nature and scalability. Compared to visible and near-infrared, the relative long wavelengths of IR light make it possible to produce three-dimensional IR metamaterials by the state-of-the-art 3D fabrication methods. The MM's 3D architecture's improved IR detection may also be partially attributed to the increased IR accessibility. In particular, the microscale 3D printed structure for surface-enhanced IR detection in high-field areas leads to selective analyte deposition in high-field areas due to capillary forces during the drying process, giving an additional degree of autonomy in the development of the 3D printed structures for surface-enhanced IR detection. Our analysis shows the flexibility of metastructures based on emerging 3D printing techniques in tailoring the interaction between IR light and materials on a subwavelength scale.
Source link: https://doi.org/10.1063/5.0093332
The consistent results between experimental results and simulation results establishes the possibility of the proposed optimization procedure and effectiveness of the newly developed acoustic metamaterial absorber, as well as the desired sound absorption results under specific conditions. The experimental findings show that parallel-connection square Helmholtz resonators can achieve a programmable frequency control by parameter optimization, which is intended to encourage its use in reducing factory noise.
Source link: https://doi.org/10.3390/ma15103417
Terahertz metamaterial biosensor is a label-free affinity sensor that increases the sensitivity of the local electromagnetic field. The sensor can detect different electromagnetic effects of the sample in the terahertz band between 1. 079 THz and 2. 271 THz. We assess the operation of a terahertz sensor by using absorption characteristics and sensitivity. The sensor has a minimum refractive index change of 0. 004 and with good sensing results, with high selectivity characteristics in frequency, a sensitivity of 693. 7 GHz/RIU, and sensor captures biological samples with minimum refractive index change of 0. 004 and excellent sensing performance. The sensor units designed in this paper have limited interactions among them, work stably, and are quickly manufactured. The sensor unit can significantly improve light and matter interactions, and has broad application prospects in terahertz high-sensitivity biosensing detection.
Source link: https://doi.org/10.7498/aps.71.20212303
Abstract The new metamaterial absorber with sandwich structure is able to achieve nearly 100% microwave absorption. This absorber contains semiconductor Ge in a molded pattern in the unit cell. Ge's conductivity on the metamaterial varies under different pump power of the incident laser light. In this way, the absorber's absorption rate can be adjusted.
Source link: https://doi.org/10.1088/1742-6596/2219/1/012030
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