scholarly journals Wide-Angle Polarization-Independent Ultra-Broadband Absorber from Visible to Infrared

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 27 ◽  
Author(s):  
Jing Liu ◽  
Wei Chen ◽  
Jia-Chun Zheng ◽  
Yu-Shan Chen ◽  
Cheng-Fu Yang
Keyword(s):  
Incidence Angle ◽  
Impedance Matching ◽  
Infrared Light ◽  
Localized Surface Plasmon ◽  
Polarization Angle ◽  
Wide Angle ◽  
Broadband Absorber ◽  
Planar Film ◽  
Absorber Structure ◽  
Polarization Independent

We theoretically proposed and numerically analyzed a polarization-independent, wide-angle, and ultra-broadband absorber based on a multi-layer metasurface. The numerical simulation results showed that the average absorption rates were more than 97.2% covering the broad wavelength of 400~6000 nm (from visible light to mid-infrared light) and an absorption peak was 99.99%, whatever the polarization angle was changed from 0° to 90°. Also, as the incidence angle was swept from 0° to 55°, the absorption performance had no apparent change over the wavelength ranges of 400 to 6000 nm. We proved that the proposed metasurface structure was obviously advantageous to achieve impedance matching between the absorber and the free space as compared with conventionally continuous planar-film structures. The broadband and high absorption resulted from the strong localized surface plasmon resonance and superposition of resonant frequencies. As expectable the proposed absorber structure will hold great potential in plasmonic light harvesting, photodetector applications, thermal emitters and infrared cloaking.

A simple two-layer broadband metamaterial absorber for solar cells

2021 ◽  
pp. 2150291
Author(s):  
Fanyi Liu ◽  
Limei Qi
Keyword(s):  
Solar Cells ◽  
Precious Metal ◽  
Simple Structure ◽  
Impedance Matching ◽  
Cost Effective ◽  
Metamaterial Absorber ◽  
Matching Theory ◽  
Broadband Absorber ◽  
Broadband Absorption ◽  
Silicon Rods

A broadband absorber composed of silicon rods and nickel ground is proposed in the visible band. The absorption above 98% can be obtained in the frequency range of [Formula: see text] THz with strong polarization independence and angle independence. The impedance matching theory and field distributions of eigenmodes are used to analyze the physical mechanism of the broadband absorption. The absorber has a simple structure with only two layers, which is composed of silicon and nickel. Nickel is a non-precious metal, which is cheaper than the precious metal materials commonly used in metamaterial absorber. The proposed cost-effective absorber with simple structure has great potential in the application of solar cells.

scholarly journals Design and Fabrication of Moth-Eye Subwavelength Structure with a Waist on Silicon for Broadband and Wide-Angle Anti-Reflection Property

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 360 ◽  
Author(s):  
He Lin ◽  
Mingzhao Ouyang ◽  
Bingxu Chen ◽  
Qifan Zhu ◽  
Jinshuang Wu ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Incidence Angle ◽  
Structural Parameters ◽  
Diffraction Order ◽  
Wide Angle ◽  
Subwavelength Structure ◽  
Inductively Coupled ◽  
Beam Laser ◽  
Interferometric Lithography ◽  
Rigorous Coupled Wave

Reflection loss on the optical component surface is detrimental to performance. Several researchers have discovered that the eyes of moths are covered with micro- and nanostructured films that reduce broadband and wide-angle light reflection. This research proposes a new type of moth-eye subwavelength structure with a waist, which is equivalent to a gradient refractive index film layer with high–low–high hyperbolic-type fill factor distribution. The diffraction order characteristics of a moth-eye subwavelength structure are first analyzed using a rigorous coupled wave analysis. The moth-eye structural parameters are optimized within the spectral range of 2–5 μm using the finite-difference time-domain method. The experimental fabrication of the moth-eye structure with a waist array upon a silicon substrate is demonstrated by using three-beam laser interferometric lithography and an inductively coupled plasma process. The experimental and simulation results show good agreement. The experimental results show that the reflectivity of the moth-eye structure with a waist is less than 1.3% when the incidence angle is less than 30°, and less than 4% when the incidence angle is less than 60°. This research can guide the development of AR broadband optical components and wide-angle applications.

scholarly journals Polarization-independent wide-angle triple-band metamaterial absorber

2011 ◽  
Vol 19 (10) ◽  
pp. 9401 ◽  
Author(s):  
Xiaopeng Shen ◽  
Tie Jun Cui ◽  
Junming Zhao ◽  
Hui Feng Ma ◽  
Wei Xiang Jiang ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Wide Angle ◽  
Polarization Independent ◽  
Triple Band

Impedance Matching Design of a Low-Profile Wide-Angle Scanning Phased Array

2019 ◽  
Vol 67 (10) ◽  
pp. 6401-6409 ◽  
Author(s):  
Fu-Long Jin ◽  
Xiao Ding ◽  
You-Feng Cheng ◽  
Bing-Zhong Wang ◽  
Wei Shao
Keyword(s):  
Phased Array ◽  
Impedance Matching ◽  
Wide Angle ◽  
Low Profile ◽  
Matching Design

A Wideband Phased Array With Broad Scanning Range and Wide-Angle Impedance Matching

2020 ◽  
Vol 68 (8) ◽  
pp. 6022-6031
Author(s):  
Fu-Long Jin ◽  
Xiao Ding ◽  
You-Feng Cheng ◽  
Bing-Zhong Wang ◽  
Wei Shao
Keyword(s):  
Phased Array ◽  
Impedance Matching ◽  
Wide Angle ◽  
Scanning Range

scholarly journals Numerical Study of Multilayer Planar Film Structures for Ideal Absorption in the Entire Solar Spectrum

2020 ◽  
Vol 10 (9) ◽  
pp. 3276 ◽  
Author(s):  
Wei Chen ◽  
Jing Liu ◽  
Wen-Zhuang Ma ◽  
Gao-Xiang Yu ◽  
Jing-Qian Chen ◽  
...  
Keyword(s):  
Noble Metals ◽  
Numerical Study ◽  
Incident Light ◽  
Solar Spectrum ◽  
Fdtd Simulation ◽  
Polarization Angle ◽  
Solar Absorber ◽  
Solar Energy Harvesting ◽  
Planar Film ◽  
Planar Films

Here, we have theoretically proposed an ideal structure of selective solar absorber with multilayer planar films, which can absorb the incident light throughout the entire solar spectrum (300–2500 nm) and over a wide angular range, whatever the polarization angle of 0°~90°. The efficiency of the proposed absorber is proven by the Finite-Difference Time Domain (FDTD) simulation. The average absorption rate over the solar spectrum is up to 96.6%. The planar design is extremely easy to fabricate and modify, and this structure does not require lithographic processes to finish the absorbers. Improvements of the solar absorber on the basis of planar multilayer-film structures is attributed to multiple asymmetric highly lossy Fabry–Perot resonators. Because of having many virtues, such as using different refractory and non-noble metals, having angle and polarization independence, and having ideal absorption for entire solar spectrum, our proposed absorbers are promising candidates for practical industrial production of the solar-energy harvesting.

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