scholarly journals A thermally stable and polarization insensitive square-shaped water metamaterial with ultra-broadband absorption

2021 ◽  
Author(s):  
Yadgar I. Abdulkarim ◽  
Halgurd N. Awl ◽  
Fatih Ozkan Alkurt ◽  
Fahmi F. Muhammadsharif ◽  
Salah Raza Saeed ◽  
...  
Keyword(s):  
Thermally Stable ◽  
Broadband Absorption ◽  
Polarization Insensitive

scholarly journals Efficient Broadband Truncated-Pyramid-Based Metamaterial Absorber in the Visible and Near-Infrared Regions

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 784 ◽  
Author(s):  
Phuc Toan Dang ◽  
Tuan V. Vu ◽  
Jongyoon Kim ◽  
Jimin Park ◽  
Van-Chuc Nguyen ◽  
...  
Keyword(s):  
Communication Systems ◽  
Near Infrared ◽  
Cell Structure ◽  
Single Layer ◽  
Normal Incidence ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Broadband Absorption ◽  
Polarization Insensitive ◽  
Truncated Pyramid

We present a design of an ultra-broadband metamaterial absorber in the visible and near- infrared regions. The unit cell structure consists of a single layer of metallic truncated-pyramid resonator-dielectric-metal configuration, which results in a high absorption over a broad wavelength range. The absorber exhibits 98% absorption at normal incidence spanning a wideband range of 417–1091 nm, with >99% absorption within 822–1054 nm. The broadband absorption stability maintains 95% at large incident angles up to 40° for the transverse electric (TE)-mode and 20° for the transverse magnetic (TM)-mode. Furthermore, the polarization-insensitive broadband absorption is presented in this paper by analyzing absorption performance with various polarization angles. The proposed absorber can be applied for applications such as solar cells, infrared detection, and communication systems thanks to the convenient and compatible bandwidth for electronic THz sources.

scholarly journals Polarization-insensitive and wide-angle broadband absorption enhancement of molybdenum disulfide in visible regime

2018 ◽  
Vol 26 (26) ◽  
pp. 33918 ◽  
Author(s):  
Xin Luo ◽  
Zhimin Liu ◽  
Ziqiang Cheng ◽  
Jianping Liu ◽  
Qi Lin ◽  
...  
Keyword(s):  
Molybdenum Disulfide ◽  
Absorption Enhancement ◽  
Wide Angle ◽  
Broadband Absorption ◽  
Polarization Insensitive

Absorption Enhancement in Plasmonic Solar Cells by Incorporation of Periodic Nanopatterns

2011 ◽  
Vol 1322 ◽  
Author(s):  
W. Wang ◽  
S. Wu ◽  
Y.L. Lu ◽  
Kitt Reinhardt ◽  
S.C. Chen
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Light Absorption ◽  
Solar Spectrum ◽  
Thin Film Solar Cells ◽  
Absorption Enhancement ◽  
Enhancement Effect ◽  
Broadband Absorption ◽  
Polarization Insensitive ◽  
Plasmonic Solar Cells

ABSTRACTCurrently, the performances of thin film solar cells are limited by poor light absorption and carrier collection. In this research, large, broadband, and polarization-insensitive light absorption enhancement was realized via incorporation of different periodic nanopetterns. By studying the enhancement effect brought by different materials, dimensions, coverage, and dielectric environments of the metal nanopatterns, we analyzed the absorption enhancement mechanisms as well as optimization criteria for our designs. A test for totaling the absorption over the solar spectrum shows an up to ∼30% broadband absorption enhancement when comparing to conventional thin film cells.

scholarly journals Switchable and Dual-Tunable Multilayered Terahertz Absorber Based on Patterned Graphene and Vanadium Dioxide

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 619
Author(s):  
Hongyao Liu ◽  
Panpan Wang ◽  
Jiali Wu ◽  
Xin Yan ◽  
Xueguang Yuan ◽  
...  
Keyword(s):  
Fermi Level ◽  
Vanadium Dioxide ◽  
High Performance ◽  
Incidence Angle ◽  
Multilayered Structure ◽  
Dual Band ◽  
Broadband Absorption ◽  
Terahertz Absorber ◽  
Polarization Insensitive ◽  
Absorption Performance

In this paper, a switchable and dual-tunable terahertz absorber based on patterned graphene and vanadium dioxide is proposed and analyzed. By controlling the Fermi level of graphene and the temperature of vanadium dioxide, the device’s function can be switched and its absorbing properties can be tuned. When the vanadium dioxide is in an insulator state, the device can be switched from near-total reflection (>97%) to ultra-broadband absorption (4.5–10.61 THz) as the Fermi level of graphene changes from 0 to 0.8 eV. When the vanadium dioxide is changed to a metal state, the device can act as a single-band absorber (when the Fermi level of graphene is 0 eV) and a dual-band absorber with peaks of 4.16 THz and 7.3 THz (when the Fermi level of graphene is 0.8 eV). Additionally, the absorber is polarization-insensitive and can maintain a stable high-absorption performance within a 55° incidence angle. The multilayered structure shows great potential for switchable and tunable high-performance terahertz devices.

Narrowband-to-broadband switchable and polarization-insensitive terahertz metasurface absorber enabled by phase-change material

2021 ◽  
Author(s):  
Seyed Hadi Badri ◽  
M. M. Gilarlue ◽  
Sanam SaeidNahaei ◽  
Jong Su KIM
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Ground Plane ◽  
Metallic State ◽  
Broadband Absorber ◽  
Broadband Absorption ◽  
Terahertz Absorber ◽  
Wide Range ◽  
Polarization Insensitive ◽  
Change Material

Abstract A terahertz absorber with controllable and switchable bandwidth and insensitive to polarization is of great interest. Here, we propose and demonstrate a metasurface absorber with switchable bandwidth based on a phase-change material of vanadium dioxide (VO2) and verify its performance by the finite element method simulations. The metasurface absorber is composed of a hybrid cross fractal as a resonator separated from a gold ground-plane by a polyimide spacer. Switching from narrowband to broadband absorber is achieved via connecting VO2 patches to the gold first-order cross fractal converting the resonator to a third-order cross fractal. In the insulator phase of VO2, the main narrowband absorption occurs at the frequency of 6.05 THz with a 0.99 absorption and a full-width half-maximum (FWHM) of 0.35 THz. Upon insulator-to-metal transition of VO2, the metasurface achieves a broadband absorption with the FWHM of 6.17 THz. The simulations indicate that by controlling the partial phase-transition of VO2, we can tune the bandwidth and absorption level of the absorber. Moreover, the designed absorber is insensitive to polarization due to symmetry and works well for a very wide range of incident angles. In the metallic state of VO2, the absorber has an absorption exceeding 0.5 in the 3.57-8.45 THz frequency range with incident angles up to 65°.

Investigation of a broadband and polarization-insensitive optical absorber based on closed-ring resonator

2016 ◽  
Vol 25 (03) ◽  
pp. 1650032 ◽  
Author(s):  
Dan Hu ◽  
Hong-Yan Wang ◽  
Qiao-Fen Zhu ◽  
Xi-Wei Zhang ◽  
Zhen-Jie Tang
Keyword(s):  
Ring Resonator ◽  
Metamaterial Absorber ◽  
Broadband Absorption ◽  
Solar Energy Harvesting ◽  
Closed Ring ◽  
Visible Wavelength Range ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Sandwiched Structure ◽  
Compact Design

A broadband and polarization-insensitive optical metamaterial absorber (MA) based on the refractory metal chromium (Cr) closed-ring resonator is theoretically investigated. The semiconducting silicon dioxide (SiO[Formula: see text] thin film is introduced as the space layer in this sandwiched structure. Utilizing the symmetrical geometry of the proposed MA structure, polarization insensitivity of the broadband absorption is gained. The simulation results show that the absorber with Cr closed-ring array obtains an average absorption of 99.25% from 400[Formula: see text]nm to 900[Formula: see text]nm, covering the total visible wavelength range. This compact design may have potential applications in solar energy harvesting, thermal imaging, and emissivity control.

scholarly journals Polarization-Insensitive Broadband THz Absorber Based on Circular Graphene Patches

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2709
Author(s):  
Jiajia Qian ◽  
Jun Zhou ◽  
Zheng Zhu ◽  
Zhenzhen Ge ◽  
Shuting Wu ◽  
...  
Keyword(s):  
Incident Angle ◽  
Structural Parameters ◽  
Single Layer Graphene ◽  
Localized Surface Plasmon ◽  
Wide Angle ◽  
Absorption Bandwidth ◽  
Broadband Absorption ◽  
Simulation And Optimization ◽  
Symmetrical Configuration ◽  
Polarization Insensitive

A polarization-insensitive broadband terahertz absorber based on single-layer graphene metasurface has been designed and simulated, in which the graphene metasurface is composed of isolated circular patches. After simulation and optimization, the absorption bandwidth of this absorber with more than 90% absorptance is up to 2 THz. The simulation results demonstrate that the broadband absorption can be achieved by combining the localized surface plasmon (LSP) resonances on the graphene patches and the resonances caused by the coupling between them. The absorption bandwidth can be changed by changing the chemical potential of graphene and the structural parameters. Due to the symmetrical configuration, the proposed absorber is completely insensitive to polarization and have the characteristics of wide angle oblique incidence that they can achieve broadband absorption with 70% absorptance in the range of incident angle from 0° to 50° for both TE and TM polarized waves. The flexible and simple design, polarization insensitive, wide-angle incident, broadband and high absorption properties make it possible for our proposed absorber to have promising applications in terahertz detection, imaging and cloaking objects.

scholarly journals Highly Transparent Broadband and Polarization-Insensitive Absorber Based on Metasurface

2020 ◽  
Vol 10 (24) ◽  
pp. 9125
Author(s):  
Houdi Xiao ◽  
Ruiru Qin ◽  
Mingyun Lv ◽  
Chuanzhi Wang
Keyword(s):  
Incidence Angle ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Light Transmittance ◽  
Cutoff Wavelength ◽  
Broadband Absorption ◽  
Low Profile ◽  
Wide Range ◽  
Potential Applications ◽  
Polarization Insensitive

A highly transparent polarization-insensitive metamaterial absorber with wideband microwave absorption is presented. The broadband absorption (6.0~16.7 GHz, absorptance > 85%) is achieved using three patterned resistive metasurfaces. The visible light transmittance of the absorber is as high as 85.7%. The thickness of the absorber is 4.42 mm, which is only 0.088 times of the upper-cutoff wavelength. A prototype sample is fabricated and measured to demonstrate its excellent performance. The experimental results agree well with the simulation results. In view of its wide band absorption, high transmittance, low profile, polarization insensitivity and wide incidence angle stability, the presented absorber has a wide range of potential applications.

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