Design of a Polarization-Insensitive and Wide-Angle Triple-Band Metamaterial Absorber

Photonics, Год журнала: 2025, Номер 12(4), С. 386 - 386

Опубликована: Апрель 16, 2025

This paper proposes a tri-band wide-angle polarization-insensitive absorber operating in the C-band and Ku-band, based on design concept of metal–dielectric–metal. The achieves absorption efficiencies 99.05%, 99.3%, 97.9% at 4.23 GHz, 7.403 14.813 respectively. first two frequencies are C-band, while third frequency is both which commonly used satellite communication. designed consists three differently sized regular hexagonal rings. To analyze interaction mechanism between electromagnetic wave absorber, we applied theory impedance matching equivalent media to metamaterial properties absorber. In addition, circuit model has been analyzed. We then determined existence coupled resonances top bottom surfaces by analyzing distribution electric field, magnetic surface currents By varying polarization angle incident incoming wave, found that exhibits insensitivity characteristics. TE TM waves maintain more than 90% efficiency up angles 50° 60°, absorber’s thickness 1.07 mm, 0.0154 times wavelength corresponding lowest resonant (λ0), edge length subunit’s hexagon 7.5 mm (0.108λ0), making sub-wavelength scale maintaining its compactness. proposed operates can be field communications, achieving functions such as shielding stealth.

Язык: Английский

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Large-angle directional scattering of terahertz beams based on all-dielectric metasurface

The European Physical Journal D, Год журнала: 2025, Номер 79(5)

Опубликована: Май 1, 2025

Язык: Английский

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Convolutional neural network for coded metasurface inverse design

Applied Physics B, Год журнала: 2025, Номер 131(6)

Опубликована: Май 10, 2025

Язык: Английский

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Real-time Holographic Imaging Programmable Metasurfaces Based on Hardware Accelerator Computation

Precision Engineering, Год журнала: 2025, Номер unknown

Опубликована: Май 1, 2025

Язык: Английский

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Strong Coupling Based on Quasibound States in the Continuum of Nanograting Metasurfaces in Near-Infrared Region

Photonics, Год журнала: 2025, Номер 12(5), С. 508 - 508

Опубликована: Май 19, 2025

Quasibound states in the continuum (qBICs) have aroused much attention as a feasible stage to investigate optical strong coupling due their extremely high-quality factors (Q-factors) and extraordinary electromagnetic field enhancement. However, current demonstrations of based on qBICs primarily focused visible spectral range, while research near-infrared (NIR) regime remains scarce. In this work, we design nanograting metasurface supporting Friedrich–Wintgen bound (FW BICs). We demonstrate that FW BIC formation stems from destructive interference between Fabry–Pérot cavity modes metal–dielectric hybrid guided-mode resonances. To qBIC–exciton system, simulated interaction MoTe2 excitons metasurfaces. A Rabi splitting 55.4 meV was observed, which satisfies criterion. Furthermore, chiral medium layer is modeled inside by rewriting weak expression boundary conditions. mode qBIC–chiral system circular dichroism (CD) spectrum demonstrates response successfully transferred exciton–polaritons systems through coupling. comparison existing studies, our work significantly larger CD signal under same Pascal parameters with thinner dielectric layer. Our provides new ideal platform for investigating quasibound continuum, exhibits promising applications biomedical detection.

Язык: Английский

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Compact and High-Efficiency Liquid-Crystal-on-Silicon for Augmented Reality Displays

Photonics, Год журнала: 2024, Номер 11(7), С. 669 - 669

Опубликована: Июль 17, 2024

Compact and high efficiency microdisplays are essential for lightweight augmented reality (AR) glasses to ensure longtime wearing comfort. Liquid-crystal-on-silicon (LCoS) is a promising candidate because of its high-resolution density, brightness, low cost. However, bulky illumination system with polarizing beam splitter (PBS) cube remains an urgent issue be overcome. To reduce the volume LCoS system, here, we propose compact structure four thin PBS cuboids. Through simulations, optical 36.7% unpolarized input light can achieved while maintaining reasonably good spatial uniformity. Such novel design expected have significant impact on future AR glasses.

Язык: Английский

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Bifocal lenses with adjustable intensities enabled by bilayer liquid crystal structures

Optics Letters, Год журнала: 2024, Номер 49(19), С. 5495 - 5495

Опубликована: Авг. 13, 2024

In this paper, we propose bifocal lenses based on bilayer structures composed of a liquid crystal (LC) cell and LC polymer, the relative intensity two foci can be adjusted arbitrarily through applying an external voltage. Two layers have different light modulation functions: when circularly polarized passes first layer, part outgoing is converted with PB phase another not converted; followed by second these parts would simultaneously realized but opposite signs; thus transmitted left- right-handed (LCP RCP) independently controlled. As proof-of-concept examples, longitudinal transverse are designed to split incident LCP into convergent beams orthogonal helicity, position flexibly arranged. Benefitting from electrically controlled polarization conversion efficiency (PCE) cell, arbitrarily. Experimental results agree well theoretical calculations. Besides, broadband edge imaging system proposed also been demonstrated. This paper presents simple method design functional multilayer device may potentials in optical interconnection, biological imaging, computing.

Язык: Английский

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Three-layer polarisation volume grating with enhanced diffraction efficiency and FOV in AR and VR applications

Liquid Crystals, Год журнала: 2024, Номер unknown, С. 1 - 10

Опубликована: Ноя. 4, 2024

In the rapidly evolving fields of Augmented Reality (AR) and Virtual (VR), achieving high diffraction efficiency a wide field view (FOV) is critical for enhancing visual experience. This paper presents three-layer Polarisation Volume Grating (TL-PVG) structure designed to address limitations single-layer PVGs in AR/VR applications. By stacking multiple PVG layers with different tilt angles, TL-PVG achieves an expanded angular bandwidth improved efficiency, enabling brighter more immersive displays. The proposed incorporates polarisation multiplexing optimise optical by approximately 75%, thereby image brightness sharpness. experimental results demonstrate that significantly outperforms traditional PVGs, offering promising solution waveguide elements next-generation study provides comprehensive analysis fabrication process, properties, applications TL-PVGs, highlighting their potential revolutionise technology.

Язык: Английский

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Research progress on dynamic holographic display technology based on metasurfaces

Optics & Laser Technology, Год журнала: 2024, Номер 182, С. 112071 - 112071

Опубликована: Ноя. 7, 2024

Язык: Английский

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Reconfigurable metasurface design with hallucination and stealth capabilities

The European Physical Journal D, Год журнала: 2024, Номер 78(12)

Опубликована: Дек. 1, 2024

Язык: Английский

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