Mechanically robust, UV screener core–double-shell nanostructures provide enhanced shielding for EM radiations over wide angle of incidence

Nanoscale ◽  
2020 ◽  
Vol 12 (29) ◽  
pp. 15775-15790 ◽  
Author(s):  
Yudhajit Bhattacharjee ◽  
Sambit Bapari ◽  
Suryasarathi Bose
Keyword(s):  
Angle Of Incidence ◽  
Wide Angle ◽  
Shell Nanostructures ◽  
Dielectric Spacer ◽  
Nanostructure Material

Herein, first, of its kind core–double shell nanostructure material were synthesized in which ferrite (Fe3O4) acts as a diffused shell around conducting core (carbon nanosphere, CNS) separated by a dielectric spacer SiO2 for various applications.

Highly flexible wide angle of incidence terahertz metamaterial absorber: Design, fabrication, and characterization

2008 ◽  
Vol 78 (24) ◽  
Author(s):  
Hu Tao ◽  
C. M. Bingham ◽  
A. C. Strikwerda ◽  
D. Pilon ◽  
D. Shrekenhamer ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Angle Of Incidence ◽  
Wide Angle ◽  
Fabrication And Characterization

scholarly journals Wide-angle Reconfigurable Refraction by Silicon Fourier Metasurfaces

2021 ◽  
Vol 2015 (1) ◽  
pp. 012005
Author(s):  
A A Antonov ◽  
M V Gorkunov
Keyword(s):  
Analytical Approach ◽  
Numerical Solutions ◽  
Full Scale ◽  
Silicon Films ◽  
Angle Of Incidence ◽  
Wide Angle ◽  
Angular Range ◽  
Optical Setup ◽  
Fourier Harmonics ◽  
Rayleigh Hypothesis

Abstract We design metasurfaces based on silicon films with smooth relief described by several Fourier harmonics and study their ability to redirect the refracted light over a wide angular range controlled by subtle variations of the optical setup. We use semi-analytical approach based on the Rayleigh hypothesis as well as full-scale numerical solutions to optimize the relief shape. To illustrate the reconfigurability potential, we design metasurfaces efficiently redirecting the refracted light from 83° to −73° with respect to the normal, when the angle of incidence is varied from 0° to 2°, and from 80° to −74°, when the substrate permittivity is altered from 2.3 to 2.2.

scholarly journals 3D-Printed Low-Cost Dielectric-Resonator-Based Ultra-Broadband Microwave Absorber Using Carbon-Loaded Acrylonitrile Butadiene Styrene Polymer

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1249 ◽  
Author(s):  
Jian Ren ◽  
Jia Yin
Keyword(s):  
Dielectric Resonator ◽  
Fused Deposition Modeling ◽  
Low Cost ◽  
Acrylonitrile Butadiene Styrene ◽  
Microwave Measurement ◽  
Angle Of Incidence ◽  
Wide Angle ◽  
Fused Deposition ◽  
Operating Band ◽  
Butadiene Styrene

In this study, an ultra-broadband dielectric-resonator-based absorber for microwave absorption is numerically and experimentally investigated. The designed absorber is made of the carbon-loaded Acrylonitrile Butadiene Styrene (ABS) polymer and fabricated using the 3D printing technology based on fused deposition modeling with a quite low cost. Profiting from the fundamental dielectric resonator (DR) mode, the higher order DR mode and the grating mode of the dielectric resonator, the absorber shows an absorptivity higher than 90% over the whole ultra-broad operating band from 3.9 to 12 GHz. The relative bandwidth can reach over 100% and cover the whole C-band (4–8 GHz) and X-band (8–12 GHz). Utilizing the numerical simulation, we have discussed the working principle of the absorber in detail. What is more, the absorption performance under different incident angles is also simulated, and the results indicate that the absorber exhibits a high absorptivity at a wide angle of incidence. The advantages of low cost, ultra-broad operating band and a wide-angle feature make the absorber promising in the areas of microwave measurement, stealth technology and energy harvesting.

scholarly journals PARTICLE SWARM OPTIMIZATION FOR OPTIMAL DESIGN OF BROADBAND MULTILAYER MICROWAVE ABSORBER FOR WIDE ANGLE OF INCIDENCE

2015 ◽  
Vol 62 ◽  
pp. 121-135 ◽  
Author(s):  
Subhanwit Roy ◽  
Souptik Dutta Roy ◽  
Jyotirmay Tewary ◽  
Ananya Mahanti ◽  
Gautam Kumar Mahanti
Keyword(s):  
Particle Swarm Optimization ◽  
Optimal Design ◽  
Particle Swarm ◽  
Microwave Absorber ◽  
Angle Of Incidence ◽  
Wide Angle ◽  
Swarm Optimization

scholarly journals Frequency-Reconfigurable Wide-Angle Terahertz Absorbers Using Single- and Double-Layer Decussate Graphene Ribbon Arrays

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 834 ◽  
Author(s):  
Longfang Ye ◽  
Fang Zeng ◽  
Yong Zhang ◽  
Xiong Xu ◽  
Xiaofan Yang ◽  
...  
Keyword(s):  
Double Layer ◽  
Single Layer ◽  
Angular Stability ◽  
Single Layer Graphene ◽  
Angle Of Incidence ◽  
Wide Angle ◽  
Graphene Ribbon ◽  
Absorption Bands ◽  
Layer Graphene ◽  
Absorbance Peak

We propose and numerically demonstrate two novel terahertz absorbers made up of periodic single- and double-layer decussate graphene ribbon arrays. The simulated results show that the proposed absorbers have narrowband near-unity terahertz absorption with ultra-wide frequency reconfiguration and angular stability. By tuning the Fermi level of graphene ribbons, the over 90% absorbance peak frequency of the absorber with single-layer graphene structure can be flexibly adjusted from 6.85 to 9.85 THz for both the transverse magnetic (TM) and transverse electric (TE) polarizations. This absorber with single-layer graphene demonstrates excellent angular stability with the absorbance peaks of the reconfigurable absorption bands remaining over 99.8% in a wide angle of incidence ranging from 0 to 70°. The tuning frequency can be significantly enhanced by using the absorber with double-layer graphene structure from 5.50 to 11.28 THz and 5.62 to 10.65 THz, approaching two octaves under TM and TE polarizations, respectively. The absorbance peaks of the reconfigurable absorption band of this absorber for both polarizations maintain over 70%, even at a large angle of incidence up to 70°. Furthermore, an analytical fitting model is also proposed to accurately predict the absorbance peak frequencies for this variety of absorbers. Benefitting from these attractive properties, the proposed absorber may have great potential applications in tunable terahertz trapping, detecting, sensing, and various terahertz optoelectronic devices.

scholarly journals Wide Angle of Incidence-Insensitive Polarization-Independent THz Metamaterial Absorber for Both TE and TM Mode Based on Plasmon Hybridizations

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 671 ◽  
Author(s):  
Xiu Tao Huang ◽  
Cong Hui Lu ◽  
Can Can Rong ◽  
Sheng Ming Wang ◽  
Ming Hai Liu
Keyword(s):  
Metamaterial Absorber ◽  
Angle Of Incidence ◽  
Wide Angle ◽  
Tm Mode ◽  
Polarization Independent

scholarly journals Optimal design of multilayer diffractive optical element in wide angle of incidence

2021 ◽  
pp. 127340
Author(s):  
Bo Zhang ◽  
Keyan Dong ◽  
Mingxu Piao ◽  
Jianing Wang ◽  
Ru Jia ◽  
...  
Keyword(s):  
Optimal Design ◽  
Optical Element ◽  
Diffractive Optical Element ◽  
Angle Of Incidence ◽  
Wide Angle
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