Ultrathin broadband terahertz metamaterial based on single-layer nested patterned graphene

Physics Letters A, Год журнала: 2025, Номер unknown, С. 130262 - 130262

Опубликована: Янв. 1, 2025

Язык: Английский

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Large-field objective lens for multi-wavelength microscopy at mesoscale and submicron resolution

Opto-Electronic Advances, Год журнала: 2024, Номер 7(6), С. 230212 - 230212

Опубликована: Янв. 1, 2024

Язык: Английский

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Focus control of wide-angle metalens based on digitally encoded metasurface

Opto-Electronic Advances, Год журнала: 2024, Номер 7(8), С. 240095 - 240095

Опубликована: Янв. 1, 2024

Based on the principle of super-symmetric lens with quadratic phase gradient transformation, combined digital coding metasurface, we propose a wide-angle coded metalens for focusing control in two-dimensional space. This achieves focus shift x-direction by changing oblique incidence angle incident wave, and y-direction combining convolution digitally metasurface to achieve flexible light plane. The unit is mainly composed three-layer metal structure two layers medium, transmission obtained middle layer structure, which turn obtains required distribution metalens. design realizes function large viewing at x-polarized incidence, control. Experimentally, prepared designed tested experimental results are good agreement results.

Язык: Английский

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Mid-infrared bimodal wide metamaterial absorber based on double-layer silicon nitride structure

Materials Research Bulletin, Год журнала: 2024, Номер 174, С. 112751 - 112751

Опубликована: Фев. 20, 2024

Язык: Английский

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Free-form catenary-inspired meta-couplers for ultra-high or broadband vertical coupling

Nanophotonics, Год журнала: 2025, Номер 14(8), С. 1145 - 1155

Опубликована: Янв. 7, 2025

Abstract Metasurface-assisted waveguide couplers, or meta-couplers, innovatively link free-space optics with on-chip devices, offering flexibility for polarization and wavelength (de)multiplexing, mode-selective coupling, guided mode manipulation. However, conventional meta-couplers still face challenges low coupling efficiency narrow bandwidth due to critical near-field caused by constraints unit-cell–based design approach, which cannot be accurately addressed using traditional methods. In this paper, quasi-continuous dielectric catenary arrays are first employed enhance addressing adjacent issues of discrete metasurface. Then, diffraction analysis demonstrates that the performance forward-designed couplers is hindered spurious orders destructive interference. To further performance, an adjoint-based topology optimization algorithm utilized customize electric near-field, can effectively suppress interference, achieving ultra-high 93 % 16.7 dB extinction ratios at 1,550 nm. Additionally, a broadband meta-coupler exceeds 350 nm 50 average across O- L-bands multiobjective optimization. These high-performance devices may render them suitable applications in optical communications, sensing, nonlinear optics. Moreover, inverse method shows potential improving various metasurface-integrated devices.

Язык: Английский

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Design of a Tunable Metamaterial Absorption Device with an Absorption Band Covering the Mid-Infrared Atmospheric Window

Photonics, Год журнала: 2025, Номер 12(2), С. 148 - 148

Опубликована: Фев. 12, 2025

We propose a highly efficient broadband tunable metamaterial infrared absorption device. The design is modeled using the three-dimensional finite element method for results show that device captures over 90% of light in wavelength range from 6.10 μm to 17.42 μm. utilize VO2’s phase change property adjust device, allowing average level vary between 20.61% and 94.88%. In this study, we analyze electromagnetic field distribution at its peak point find high achieved through both surface plasmon resonance Fabry–Perot cavity resonance. structural parameters are fine-tuned parameter scanning. By comparing our work with previous studies, demonstrate superior performance design. Additionally, investigate polarization angle incident it insensitive these factors. Importantly, simple structure broadens potential uses photodetection, stealth, sensing.

Язык: Английский

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High sensitivity and high figure of merit graphene mid-infrared multi-band tunable metamaterial perfect absorber

Surfaces and Interfaces, Год журнала: 2024, Номер unknown, С. 105137 - 105137

Опубликована: Сен. 1, 2024

Язык: Английский

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A simulation work on thermally tunable and highly sensitive terahertz smart window device with dual-band absorption and wide-ranging transmission based on VO2 phase-change material

Optics & Laser Technology, Год журнала: 2024, Номер 178, С. 111210 - 111210

Опубликована: Июнь 1, 2024

Язык: Английский

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Silicon nitride-based ultra-wideband ultra-long infrared metamaterial absorber with large angle and high absorption

Materials Today Communications, Год журнала: 2024, Номер 39, С. 109229 - 109229

Опубликована: Май 14, 2024

Язык: Английский

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Ultra-broadband Absorber and Perfect Thermal Emitter for High-Efficiency Solar Energy Absorption and Conversion

Renewable Energy, Год журнала: 2024, Номер 237, С. 121818 - 121818

Опубликована: Ноя. 5, 2024

Язык: Английский

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