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.

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.

Wide-band perfect optical absorption and photo-thermal effect for three-tier nanogate

2014 ◽  
Vol 28 (16) ◽  
pp. 1450135
Author(s):  
G. W. Cai ◽  
P. Ding ◽  
J. Q. Wang ◽  
E. J. Liang
Keyword(s):  
Thermal Imaging ◽  
Absorption Rate ◽  
Incident Angle ◽  
Thermal Characteristics ◽  
Wide Band ◽  
Perfect Absorber ◽  
Perfect Absorption ◽  
Cooling Method ◽  
Wide Absorption Band ◽  
Calculation Results

This paper designed a perfect optical absorber based on three-tier gate nanostructure, which shows a wide-band perfect absorption in the wavelength range of 200–560 nm as a transverse wave incidents to the nanostructure with the incident angle 35°< θ< 65°. When θ = 45°, a wide absorption band with the absorption rate more than 94% is observed, with the maximum of absorption rate reaching 99.3% at the wavelength of 430 nm. We also analyze the thermal characteristics of the perfect absorber. The band ranging from 560 nm to 1200 nm presents an increasing absorption rate with the increase of temperature. The calculation results of multi-physics analysis indicate that different cooling method causes different temperature distribution for the perfect absorber. This three-tier gate perfect absorber may find applications on broadband visible detectors, microbolometer and thermal imaging.

scholarly journals Plasmonically induced perfect absorption in graphene/metal system

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Cheng Hu ◽  
Qi Lin ◽  
Xiang Zhai ◽  
Mengting Wen ◽  
Lingling Wang
Keyword(s):  
Metal System ◽  
Perfect Absorption

scholarly journals Quad-Band Plasmonic Perfect Absorber for Visible Light with a Patchwork of Silicon Nanorod Resonators

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1954 ◽  
Author(s):  
Can Cao ◽  
Yongzhi Cheng
Keyword(s):  
Visible Light ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Localized Surface Plasmon ◽  
Perfect Absorber ◽  
Absorption Properties ◽  
Perfect Absorption ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Band Absorption

In this paper, a plasmonic perfect absorber (PPA) based on a silicon nanorod resonator (SNRR) for visible light is proposed and investigated numerically. The proposed PPA is only a two-layer nanostructure consisting of a SNRR periodic array and metal substrate. The perfect absorption mainly originates from excitation of the localized surface plasmon resonance (LSPR) mode in the SNRR structure. The absorption properties of this design can be adjusted by varying the radius (r) and height (h) of the SNRR structure. What is more, the stronger quad-band absorption can be achieved by combing four different radius of the SNRR in one period as a super unit-cell. Numerical simulation indicates that the designed quad-band PPA can achieve the absorbance of 99.99%, 99.8%, 99.8%, and 92.2% at 433.5 THz, 456 THz, 482 THz, and 504.5 THz, respectively. Further simulations show that the proposed PPA is polarization-insensitive for both transverse electric (TE) and transverse magnetic (TM) modes. The proposed PPA can be a desirable candidate for some potential applications in detecting, sensing, and visible spectroscopy.

scholarly journals INFLUENCE OF CREEP CONCRETE ON SPACE STABILITY THIN-WALLED DOME COVERINGS

2021 ◽  
Vol 1 (24) ◽  
Author(s):  
Ekaterina Prokshits ◽  
Sergey Gridnev ◽  
Olga Sotnikova ◽  
Iana Zolotukhina
Keyword(s):  
Theory Of Elasticity ◽  
Deformation Condition ◽  
Software Systems ◽  
Geometrical Parameters ◽  
Loss Of Stability ◽  
Construction Mechanics ◽  
Body Construction ◽  
Calculation Results ◽  
Load Action ◽  
Thin Walled

The task was set, due to the capabilities of modern software systems, to assess the effect of the increase in inelastic deformations under prolonged load action on the loss of stability of thin-walled dome coverings. The study of the dependences of the forms of the loss of stability of dome covering from creep concrete that will help further with optimization calculations when determining of the most influencing parameters of designs. Calculation results of thin-walled concrete dome roof of circular outline under the influence of operational loadings with use of two modern program complexes are given in article. It is investigated intense and deformation condition of dome coverings as a part of construction from position of forecasting of possible forms of loss of stability, with use of opportunities of the final and element «MidasCivil» computer system. In work provisions of the theory of elasticity, mechanics of deformation of solid body, construction mechanics and also methods of mathematical modeling based on application of finite element method are used. The received results give the chance to rationally select geometrical parameters and material of design and also to set structural strength safety factors at the solution of problems of stability of different covers taking into account possible creep of material.

scholarly journals Hybrid Metamaterials Perfect Absorber and Sensitive Sensor in Optical Communication Band

2021 ◽  
Vol 9 ◽  
Author(s):  
Xuehan Liu ◽  
Keyang Li ◽  
Zhao Meng ◽  
Zhun Zhang ◽  
Zhongchao Wei
Keyword(s):  
Optical Communication ◽  
Electromagnetic Waves ◽  
Incident Angle ◽  
Silicon Layer ◽  
Resonance Wavelength ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Perfect Absorber ◽  
Perfect Absorption

A subwavelength metamaterial perfect absorber (MPA) in optical communication band was proposed and tested using the finite-difference time-domain method. The absorber is periodic and comprises a top layer of diamond silicon surrounded by L-shaped silicon and a gold layer on the substrate. It can achieve dual-band perfect absorption, and one of the peaks is in the optical communication band. By changing the gap (g) between two adjacent pieces of L-shaped silicon, and the thickness (h) of the silicon layer, the resonance wavelength of absorption peak can be tuned. When the incident electromagnetic wave entered the absorber, the metamaterial absorber could almost completely consume the incident electromagnetic waves, thereby achieving more than 99% perfect absorption. The absorption peak reaches 99.986% at 1310 nm and 99.421% at 1550 nm. Moreover, the MPA exposed to different ambient refraction indexes can be applied as plasma sensors, and can achieve multi-channel absorption with high figure of merit (FOM*) value and refractive index (RI) sensitivity. The FOM* values at 1310 nm and 1550 nm are 6615 and 168, respectively, and both resonance peaks have highly RI sensitivity. The results confirm that the MPA is a dual-band, polarization-independent, wide-angle absorber and insensitive to incident angle. Thence it can be applied in the fields of optical communication, used as a light-wave filter and plasma sensor, and so on.

scholarly journals Research on Perfect and Tunable Metamaterial Absorber Based on Crosshair-shaped Graphene

2021 ◽  
Vol 2109 (1) ◽  
pp. 012015
Author(s):  
Yiran Guo ◽  
Yunping Qi ◽  
Chuqin Liu ◽  
Weiming Liu ◽  
Xiangxian Wang
Keyword(s):  
Relaxation Time ◽  
Chemical Potential ◽  
Incident Angle ◽  
Fdtd Method ◽  
Reference Value ◽  
Metamaterial Absorber ◽  
Selective Absorption ◽  
Perfect Absorber ◽  
Wide Angle ◽  
Perfect Absorption

Abstract Graphene, as a new nano-material, according to the physical properties of electric field localization and selective absorption on light of surface plasmon resonance (SPR), a tunable, multi-band and wide-angle perfect absorber based on crosshair-shaped graphene is devised by using the Finite Difference in Time Domain (FDTD) method. In this paper, the effects of chemical potential, relaxation time, and incident angle of light on the absorptivity of graphene are systematically discussed. The simulation experiment shows that there are two absorption peaks with perfect absorption rate appeared in the study range, and the maximum modulation index can be obtained by changing the relaxation time. Finally, it proves that the absorber is insensitive to wide-angle of light. Thus, it is able to be concluded that the absorber has a great reference value to sensor, wireless communication, biomedical and other fields.

scholarly journals A Hydrodynamic Methodology And CFD Analysis For Performance Prediction Of Stepped Planing Hulls

2015 ◽  
Vol 22 (2) ◽  
pp. 23-31 ◽  
Author(s):  
Hassan Ghassemi ◽  
Mojtaba Kamarlouei ◽  
Sajad Taj Golah Veysi
Keyword(s):  
High Speed ◽  
Hydrodynamic Performance ◽  
Hydrodynamic Characteristics ◽  
Geometrical Parameters ◽  
Cfd Analysis ◽  
Analysis Model ◽  
Marine Coatings ◽  
Resistance Reduction ◽  
Calculation Results ◽  
Fruitful Research

AbstractNowadays all efforts in planing hull research are focused on resistance reduction for achieving the highest speed in fast planing crafts. Furthermore, many fruitful research projects have been carried out on marine coatings, planing equipment, and optimization of propeller and hull form, which revolutionized industry of high - speed crafts and made them an efficient survival vehicle in coastal areas and rivers. In this paper the hydrodynamic performance of planing hulls are investigated by means of a modified Savitsky model for both non-stepped and stepped bodies. Meanwhile, in order to meet this goal reasonably, effective geometrical parameters of planing hull are investigated and then operational hydrodynamic characteristics of the craft are predicted by using a computational program. Finally, the calculation results are verified by means of a CFD-analysis model.

THE MIXING OF A JET OF CARBON DIOXIDE FROM SMASHING SUBSONIC FLOW

2018 ◽  
Vol 8 (2) ◽  
pp. 142-145
Author(s):  
Olga A. BALANDINA
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Numerical Calculation ◽  
Temperature Distribution ◽  
Subsonic Flow ◽  
Gas Jet ◽  
Geometrical Parameters ◽  
Aspect Ratios ◽  
Calculation Results ◽  
Jet Blowing

Presents the results of a numerical calculation of the interaction of the jet of carbon dioxide from smashing subsonic air fl ow. Were identifi ed and analyzed pressure values, the trajectories of the jet, the velocity profi les at small blowing intensities. The comparison of calculation results with experimental data of other authors. The obtained curves of the temperature distribution for carrying air fl ow and the jet issued from a slit-like holes with aspect ratios 1:2; 1:3; 1:4. Analysis of the results showed that the geometrical parameters of the jet blowing holes does not signifi cantly aff ect the temperature distribution in the region behind the jet. The research results can be used in the design of the jet bodies of the gas burners of boilers. Will conduct further modeling to enhance the process of formation of the gas-air mixture in the gas jet type burners.

scholarly journals Static Characterization of the Birefringence Effect in the Semiconductor Optical Amplifier Using the Finite Difference Method

2015 ◽  
Vol 5 (1) ◽  
pp. 38
Author(s):  
A. Elyamani ◽  
A. Zatni ◽  
H. Bousseta ◽  
A. Moumen
Keyword(s):  
Numerical Model ◽  
Semiconductor Optical Amplifier ◽  
Optical Power ◽  
Optical Amplifier ◽  
Input Power ◽  
Geometrical Parameters ◽  
Saturated Gain ◽  
Birefringence Effect ◽  
The Impact

Knowing the various physical mechanisms of the semiconductor optical amplifier (SOA) helps us to develop a more complete numerical model. It also enables us to simulate more realistically the static behavior of the SOA<sub>s</sub>’ birefringence effect. This way, it allows us to study more precisely the behavior of SOA<sub>s</sub>, and particularly the impact of the amplified spontaneous emission (ASE) or the pump and probe signals as well as the optical functions based on the non-linearity of the component. In static regime, the SOA<sub>s</sub> possess a very low amplification threshold and a saturation power of the gain which mainly depends on the optical power injected into the active region. Beyond the optical input power, the SOA is in the saturated gain regime which gives it a nonlinear transmission behavior. Our detailed numerical model offers a set of equations and an algorithm that predict their behavior. The equations form a theoretical base from which we have coded our model in several files.cpp that the <strong>Language C++</strong> executes. It has enabled us, from the physical and geometrical parameters of the component, to recover all the relevant values ​​for a comprehensive study of SOA<sub>s</sub> in static and dynamic regimes. In this paper, we propose to make a static characterization of the effect of the nonlinear polarization rotation by realizing a pump-probe assemblage to control the power and state of polarization at the entering of the SOA.

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