scholarly journals Giant dual-band asymmetric transmission based on all-dielectric metamaterial in the near-infrared band

2021 ◽  
Author(s):  
BingYu Chen ◽  
Kun Zhang ◽  
Qun Xie ◽  
Xingrun Zhang ◽  
Lijun Guo ◽  
...  
Keyword(s):  
Near Infrared ◽  
Dual Band ◽  
Infrared Band ◽  
Asymmetric Transmission

Multi-band asymmetric transmission and mutual conversion in near-infrared band

2016 ◽  
Vol 50 (3) ◽  
pp. 395-405 ◽  
Author(s):  
Xiao-Min Zhai ◽  
Li-Fang Yao ◽  
Hui-Bo Wang ◽  
Jian-Feng Dong
Keyword(s):  
Near Infrared ◽  
Infrared Band ◽  
Asymmetric Transmission ◽  
Mutual Conversion ◽  
Multi Band

scholarly journals A Narrow Dual-Band Monolayer Unpatterned Graphene-Based Perfect Absorber with Critical Coupling in the Near Infrared

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 58 ◽  
Author(s):  
Pinghui Wu ◽  
Zeqiang Chen ◽  
Danyang Xu ◽  
Congfen Zhang ◽  
Ronghua Jian
Keyword(s):  
Optical Switching ◽  
Near Infrared ◽  
High Efficiency ◽  
Dual Band ◽  
Resonance Structure ◽  
Perfect Absorber ◽  
Critical Coupling ◽  
Infrared Band ◽  
Guided Mode ◽  
The Cross

The combination of critical coupling and coupled mode theory in this study elevated the absorption performance of a graphene-based absorber in the near-infrared band, achieving perfect absorption in the double bands (98.96% and 98.22%), owing to the guided mode resonance (the coupling of the leak mode and guided mode under the condition of phase matching, which revealed 100% transmission or reflection efficiency in the wavelet band), and a third high-efficiency absorption (91.34%) emerged. During the evaluation of the single-structure, cross-circle-shaped absorber via simulation and theoretical analysis, the cross-circle shaped absorber assumed a conspicuous preponderance through exploring the correlation between absorption and tunable parameters (period, geometric measure, and incident angle of the cross-circle absorber), and by briefly analyzing the quality factors and universal applicability. Hence, the cross-circle resonance structure provides novel potential for the design of a dual-band unpatterned graphene perfect absorber in the near-infrared band, and possesses practical application significance in photoelectric detectors, modulators, optical switching, and numerous other photoelectric devices.

scholarly journals Broad dual-band asymmetric transmission of circular polarized waves in near-infrared communication band

2017 ◽  
Vol 25 (10) ◽  
pp. 11329 ◽  
Author(s):  
Deng Fei Tang ◽  
Chuan Wang ◽  
Wei Kang Pan ◽  
Min Hua Li ◽  
Jian Feng Dong
Keyword(s):  
Near Infrared ◽  
Dual Band ◽  
Asymmetric Transmission ◽  
Infrared Communication ◽  
Polarized Waves

scholarly journals The Equivalent Thermal Conductivity of the Micro/Nano Scaled Periodic Cubic Frame Silver and Its Thermal Radiation Mechanism Analysis

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4158
Author(s):  
Haiyan Yu ◽  
Haochun Zhang ◽  
Heming Wang ◽  
Dong Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Radiation ◽  
Cell Size ◽  
Near Infrared ◽  
High Porosity ◽  
Mechanism Analysis ◽  
Infrared Band ◽  
Spectral Radiation ◽  
Radiation Mechanism ◽  
Equivalent Thermal Conductivity

Currently, there are few studies on the influence of microscale thermal radiation on the equivalent thermal conductivity of microscale porous metal. Therefore, this paper calculated the equivalent thermal conductivity of high-porosity periodic cubic silver frame structures with cell size from 100 nm to 100 µm by using the microscale radiation method. Then, the media radiation characteristics, absorptivity, reflectivity and transmissivity were discussed to explain the phenomenon of the radiative thermal conductivity changes. Furthermore, combined with spectral radiation properties at the different cross-sections and wavelength, the radiative transmission mechanism inside high-porosity periodic cubic frame silver structures was obtained. The results showed that the smaller the cell size, the greater radiative contribution in total equivalent thermal conductivity. Periodic cubic silver frames fluctuate more in the visible band and have better thermal radiation modulation properties in the near infrared band, which is formed by the Surface Plasmon Polariton and Magnetic Polaritons resonance jointly. This work provides design guidance for the application of this kind of periodic microporous metal in the field of thermal utilization and management.

scholarly journals Ultraviolet and Near‐Infrared Dual‐Band Selective‐Harvesting Transparent Luminescent Solar Concentrators

2021 ◽  
Vol 11 (12) ◽  
pp. 2003581
Author(s):  
Chenchen Yang ◽  
Wei Sheng ◽  
Mehdi Moemeni ◽  
Matthew Bates ◽  
Christopher K. Herrera ◽  
...  
Keyword(s):  
Near Infrared ◽  
Dual Band ◽  
Solar Concentrators ◽  
Selective Harvesting ◽  
Luminescent Solar Concentrators

scholarly journals Restoration method of sootiness mural images based on dark channel prior and Retinex by bilateral filter

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Ning Cao ◽  
Shuqiang Lyu ◽  
Miaole Hou ◽  
Wanfu Wang ◽  
Zhenhua Gao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Environmental Changes ◽  
Color Image ◽  
Visual Quality ◽  
Bilateral Filter ◽  
Dark Channel Prior ◽  
Infrared Band ◽  
Dark Channel ◽  
Restoration Method ◽  
Pseudo Color

AbstractEnvironmental changes and human activities can cause serious degradation of murals, where sootiness is one of the most common problems of ancient Chinese indoor murals. In order to improve the visual quality of the murals, a restoration method is proposed for sootiness murals based on dark channel prior and Retinex by bilateral filter using hyperspectral imaging technology. First, radiometric correction and denoising through band clipping and minimum noise fraction rotation forward and inverse transform were applied to the hyperspectral data of the sootiness mural to produce its denoised reflectance image. Second, a near-infrared band was selected from the reflectance image and combined with the green and blue visible bands to produce a pseudo color image for the subsequent sootiness removal processing. The near-infrared band is selected because it is better penetrating the sootiness layer to a certain extent comparing to other bands. Third, the sootiness covered on the pseudo color image was preliminarily removed by using the method of dark channel prior and by adjusting the brightness of the image. Finally, the Retinex by bilateral filter was performed on the image to get the final restored image, where the sootiness was removed. The results show that the images restored by the proposed method are superior in variance, average gradient, information entropy and gray scale contrast comparing to the results from the traditional methods of homomorphic filtering and Gaussian stretching. The results also show the highest score in comprehensive evaluation of edges, hue and structure; thus, the method proposed can support more potential studies or sootiness removal in real mural paintings with more detailed information. The method proposed shows strong evidence that it can effectively reduce the influence of sootiness on the moral images with more details that can reveal the original appearance of the mural and improve its visual quality.

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