Nano-multiwall cylinders array for ultra-broadband perfect absorption in visible regime: novel properties revealing

2014 ◽  
Vol 28 (11) ◽  
pp. 1450086
Author(s):  
Qi Han ◽  
Lei Jin ◽  
Yongqi Fu ◽  
Weixing Yu
Keyword(s):  
Polarization State ◽  
Geometrical Parameters ◽  
Substrate Thickness ◽  
Absorption Property ◽  
Perfect Absorption ◽  
Cylinder Array ◽  
Solar Energy Harvesting ◽  
Incoming Light ◽  
Light Absorption Property ◽  
High Absorption

An extraordinary light absorption property of nano-multiwall cylinder array with a periodic structure is reported. The ultra-high absorption is independent of the incoming light on polarization state and insensitive in a broad angle range. We attribute the efficient light harvesting property of nano-multiwall cylinder array to the leaky-mode resonance. Influence of geometrical parameters of the structure such as wall cylinder height, width, and substrate thickness on absorbing performance is discussed. The proposed absorber will find its application in those areas related to solar energy harvesting.

Metasurface-Based Perfect Absorber with Unique Properties Working in Ultraviolet Regime

2019 ◽  
Vol 16 (9) ◽  
pp. 3698-3702
Author(s):  
Fujuan Huang ◽  
Yongqi Fu ◽  
Shaoli Zhu
Keyword(s):  
Polarization State ◽  
Optical Power ◽  
Geometrical Parameters ◽  
Perfect Absorber ◽  
Structural Dimension ◽  
Metal System ◽  
Plasmonic Resonance ◽  
Perfect Absorption ◽  
Calculation Results ◽  
Incoming Light

We report a perfect metasurface structure-based optical absorber consisting of a tri-layer metaldielectric-metal system in ultraviolet band. Optical power absorption of over 91% has been observed in entire ultraviolet band, and can even reach to the level of as high as 99% in a certain local near waveband. Unique properties of the perfect absorption are independent on polarization state of the incoming light, and insensitive to variation of structural dimension. We discuss the effect of geometrical parameters of the structure such as height and radius on the basis of theoretical calculation results. In addition, the influence of materials upon performance of the absorber is presented. The efficient light absorption can be attributed to plasmonic resonance.

scholarly journals Broadband Absorption Based on Thin Refractory Titanium Nitride Patterned Film Metasurface

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1092
Author(s):  
Dewang Huo ◽  
Xinyan Ma ◽  
Hang Su ◽  
Chao Wang ◽  
Hua Zhao
Keyword(s):  
Titanium Nitride ◽  
Oblique Incidence ◽  
Normal Incidence ◽  
Perfect Absorber ◽  
Size Parameter ◽  
Perfect Absorption ◽  
Broadband Absorption ◽  
Solar Energy Harvesting ◽  
Difference Time ◽  
High Absorption

In this paper, a thin metasurface perfect absorber based on refractory titanium nitride (TiN) is proposed. The size parameter of the metasurface is investigated based on the finite difference time domain method and transfer matrix method. With only a 15-nm-thick TiN layer inside the silica/TiN/silica stacks standing on the TiN substrate, the near-perfect absorption throughout the visible regime is realized. The cross-talk between the upper and lower dielectric layers enables the broadening of the absorption peak. After patterning the thin film into a nanodisk array, the resonances from the nanodisk array emerge to broaden the high absorption bandwidth. As a result, the proposed metasurface achieves perfect absorption in the waveband from 400 to 2000 nm with an average absorption of 95% and polarization-insensitivity under the normal incidence. The proposed metasurface maintains average absorbance of 90% up to 50-degree oblique incidence for unpolarized light. Our work shows promising potential in the application of solar energy harvesting and other applications requiring refractory metasurfaces.

scholarly journals Independently Tunable Multipurpose Absorber with Single Layer of Metal-Graphene Metamaterials

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 284
Author(s):  
Chen Han ◽  
Renbin Zhong ◽  
Zekun Liang ◽  
Long Yang ◽  
Zheng Fang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Fermi Level ◽  
Potential Application ◽  
Single Layer ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Unit Cell ◽  
Perfect Absorption ◽  
Solar Energy Harvesting ◽  
Band Absorption

This paper reports an independently tunable graphene-based metamaterial absorber (GMA) designed by etching two cascaded resonators with dissimilar sizes in the unit cell. Two perfect absorption peaks were obtained at 6.94 and 10.68 μm with simple single-layer metal-graphene metamaterials; the peaks show absorption values higher than 99%. The mechanism of absorption was analyzed theoretically. The independent tunability of the metamaterial absorber (MA) was realized by varying the Fermi level of graphene under a set of resonators. Furthermore, multi-band and wide-band absorption were observed by the proposed structure upon increasing the number of resonators and resizing them in the unit cell. The obtained results demonstrate the multipurpose performance of this type of absorber and indicate its potential application in diverse applications, such as solar energy harvesting and thermal absorbing.

Engineering the Surface Structure of MoS2 Nanosheets by Carbon-Doping with Rich Defects to Tune UV-Visible Light Absorption Property

2017 ◽  
Vol 735 ◽  
pp. 185-188 ◽  
Author(s):  
Zhen Yin Hai ◽  
Jian Gong Du ◽  
Chen Yang Xue ◽  
Dan Feng Cui ◽  
Mohammad Karbalaei Akbari ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Photo Luminescence ◽  
Optical Bandgap ◽  
Carbon Doping ◽  
Absorption Property ◽  
Visible Light Absorption ◽  
Carbon Doped ◽  
Uv Visible ◽  
Light Absorption Property

A facile doping method utilizing inexpensive raw materials was proposed to achieve variation in optical bandgap and UV-visible light absorption property of MoS2 nanosheets. Carbon-assistant heating with degreasing cotton has demonstrated the development of carbon-doped MoS2 nanosheets with enhanced rich defects. The results obtained shown that modified MoS2 nanosheets with the lateral width of ~600 nm are exhibited shift of the intensively blue peaks of photo-luminescence (PL) comparing to those MoS2 nanosheets with a lateral dimension of larger than 1 μm. Optical bandgap of the carbon-doped MoS2 nanosheets was found to be broader than that of the pure MoS2 nanosheets and the prepared samples also exhibited a broadband UV-visible light absorption property.

Electromagnetic Characterization of High Absorption Sub-Wavelength Optical Nanostructure Photovoltaics for Solar Energy Harvesting

2013 ◽  
Vol 61 (4) ◽  
pp. 1518-1527 ◽  
Author(s):  
Timothy J. Brockett ◽  
Harish Rajagopalan ◽  
Ramesh B. Laghumavarapu ◽  
Diana Hufakker ◽  
Yahya Rahmat-Samii
Keyword(s):  
Energy Harvesting ◽  
Solar Energy ◽  
Solar Energy Harvesting ◽  
High Absorption ◽  
Sub Wavelength

Infrared Absorption Characteristics Analysis for Square Loop Nanostructure of Al Substrate

2016 ◽  
Author(s):  
Qinghui Pan ◽  
Qizhen Wang ◽  
Yong Shuai ◽  
Heping Tan
Keyword(s):  
Magnetic Resonance ◽  
Resonance Wavelength ◽  
Structure Design ◽  
Absorption Peak ◽  
Dual Band ◽  
Absorption Bands ◽  
Perfect Absorption ◽  
First Order ◽  
Characteristics Analysis ◽  
High Absorption

We present a 2D square loop-shaped nanostructure, which is made of a square loop aluminum array on Al2O3 spacer and Al substrate. High absorption peaks are obtained at 3.5μm and 9μm when the incident wave is vertically. In the design of dual-band or multi-band structure, the two high absorption bands are designed to stimulate the outer magnetic excitation of the first-order and the high-order magnetic resonance wavelength. For structure design with two absorption peaks or multiple absorption peaks, the expectation bands with high absorption would be obtained in the cooperation between first-order and higher-order magnetic resonance due to the outer structure. The main absorption peak due to the inner structure may be coupled the second absorption peak due to the outer structure. Then the absorption bandwidth could be broadened and the dual-band perfect absorption effect could be obtained in this loop-shaped structure.

Fracture energy assessment of adhesives – Part I: Is GIC an adhesive property? A neural network analysis

2021 ◽  
Vol 235 (6) ◽  
pp. 1461-1476
Author(s):  
A Akhavan-Safar ◽  
R Beygi ◽  
F Delzendehrooy ◽  
LFM da Silva
Keyword(s):  
Neural Network ◽  
Fracture Toughness ◽  
Fracture Energy ◽  
Adhesive Joints ◽  
Geometrical Parameters ◽  
Substrate Thickness ◽  
Effective Parameters ◽  
Property A ◽  
Adhesive Properties ◽  
Mode I Fracture Toughness

Different joint types and geometries have been considered to measure the fracture toughness ( Gc) of adhesives. However, results show that, sometimes, the obtained Gc values for the same adhesives are not similar in different reports. Several factors including the joints geometry, material properties of the substrate, and also the test conditions influence the obtained results. This study is conducted to find a logical connection between these factors and to find their influences on the obtained mode I fracture toughness ( GIc) to understand which parameters are the most influential and which ones are less significant. To this aim, 115 values of different GIcalready reported in the literature were collected and examined regarding the geometrical and material parameters. To find the rational relationship between the effective parameters and the reported GIcvalues, a method based on the artificial neural network technique was employed. The results revealed that whilst the fracture energy of aluminum adhesive joints is more influenced by geometrical parameters including the joint type and substrate thickness, the steel adhesive joints are more sensitive to the adhesive properties and bondline thickness. With this study, it is possible to design an optimum test by minimizing the effects of variables that cause errors in obtaining fracture toughness and also to estimate GIc of adhesives by using the developed model. On the other hand, it is also possible to design real structures in which the fracture toughness of the adhesive reaches its maximum value.

Sign in / Sign up

Export Citation Format

Share Document