The tunable absorber films of grating structure of AlCuFe quasicrystal with high Q and refractive index sensitivity

Surfaces and Interfaces, Год журнала: 2024, Номер 48, С. 104248 - 104248

Опубликована: Март 26, 2024

Язык: Английский

---

Tunable VO2 metasurface for reflective terahertz linear and circular polarization wavefront manipulation at two frequencies independently

Physica B Condensed Matter, Год журнала: 2024, Номер 681, С. 415848 - 415848

Опубликована: Март 15, 2024

Язык: Английский

---

Microstrip antenna loaded with focusing metasurface for high-gain dual-polarization and bidirectional radiation

Journal of Applied Physics, Год журнала: 2025, Номер 137(1)

Опубликована: Янв. 3, 2025

In this paper, we propose a microstrip antenna that incorporates dual-polarization and bidirectional focusing metasurface (MS) for achieving high-gain transmission in circular polarization (CP) reflection linear (LP) radiation, respectively. Initially, design MS enables independent manipulation of the transmitted CP wave at lower frequency 8.2 GHz reflected LP higher 16.2 GHz, The unit-cell comprises combination an outer bilayered split-ring resonator, along with inner arc-shaped disk resonators, all separated by dielectric substrate. Subsequently, coaxial-fed laminated is designed capable realizing radiation gain approximately 4.9 dBic 4.8 dBi, To improve performance, construct integrated MS. This configuration to achieve peak 13.1 14.6 dBi relative bandwidth 6.79% (at GHz) 13.54% reflective wave, evaluate practicality our proposed design, fabricated measured antenna, both without results obtained from these measurements closely align simulations, thereby validating effectiveness antenna. provides practical solution facilitating high-speed information communication systems.

Язык: Английский

---

Efficiency tunable broadband terahertz graphene metasurface for circular polarization anomalous reflection and plane focusing effect

Diamond and Related Materials, Год журнала: 2022, Номер 131, С. 109605 - 109605

Опубликована: Дек. 10, 2022

Язык: Английский

---

Spectrally Selective Ultra‐Broadband Solar Absorber Based on Pyramidal Structure

Advanced Photonics Research, Год журнала: 2023, Номер 5(3)

Опубликована: Дек. 26, 2023

Here, a spectrally selective solar absorber is explored and an ultra‐broadband proposed based on pyramidal structure. The finite‐difference in time domain (FDTD) software used to model the spectral characteristics magnetic absorption patterns of this absorber. emissivity less than 20% far‐infrared band over 6000 nm, showing good selectivity, total thermal conversion efficiency very close that ideal truncated by analyzing performance our absorber‐related indexes. By studying high absorber, selectivity can be better investigated depth. 200–4000 nm chosed as depth study band. possesses ultra‐wide bandwidth 3554 average 97.4%, 200–3754 band, has ultra‐high rate more 98.3%, its emitter emission 94% at temperature 1000 K. Notably, weighted 280–4000 AM1.5 98.86%, with loss only 1.14%. property mainly joint effect surface plasmon resonance coupling.

Язык: Английский

---

Dual-band terahertz reflective-mode metasurface for the wavefront manipulation of independent linear and circular polarization waves

Journal of the Optical Society of America B, Год журнала: 2023, Номер 41(2), С. 341 - 341

Опубликована: Дек. 15, 2023

Metasurfaces (MSs) are being extensively researched owing to their ability modulate the polarization and wavefront of electromagnetic (EM) waves in a flexible manner, which usually offer significant advantages including ultra-thinness, low losses, easy fabrication. However, conventional MSs typically operate well only with single polarization. Here, we propose novel design strategy for terahertz (THz) reflective-mode MS that relies on unit-cell arrangement combining propagation phase geometric phase. Our designed can achieve multiple manipulations reflection mode, not limited circular (CP) transformation, but also enabling linear (LP) conversion. The consists periodic array bilayered metal patterned resonator structures sandwiched by dielectric substrate. metallic is made outer single-split-ring (SSR) C-shaped slot (CSS), inner double-split-ring (DSR), its complementary structure. With this design, capable converting LP wave orthogonal counterpart at lower frequency ( f 1 =0.7THz) after reflection. Additionally, higher 2 =1.4THz), proposed convert right-handed CP (RCP) left-handed (LCP) upon or vice versa. π full coverage be achieved independently simultaneously adjusting opening orientation angles SSR based phase, angle DSR We numerically demonstrate beam deflection, planar focusing, vortex both reflected three representative provide proof concept. These findings reveal great potential multifunctional devices dual-polarization imaging communication systems.

Язык: Английский

---

Ultrathin and Ultra‐Broadband Terahertz Single‐Layer Metasurface Based on Double‐Arrow‐Shaped Resonator Structure for Full‐Space Wavefront Manipulation

Advanced Theory and Simulations, Год журнала: 2023, Номер 6(6)

Опубликована: Апрель 25, 2023

Abstract In this paper, a simple design of an ultrathin and ultra‐broadband single‐layer MS based on double‐arrow‐shaped resonator (DASR) structure for both transmission reflection modes in terahertz (THz) region is presented. The composed periodic array the combination metal DASR complementary circular patch (CCP) adhered dielectric substrate. Numerical results show that can convert CP wave to its orthogonal component after simultaneously, corresponding amplitudes are ≈0.45 average from 0.45 1.75 THz with relative bandwidth 118.2%, which conversion efficiency closing theoretical limit (25%) structure. Furthermore, 0–2π phase shifts reflected transmitted be achieved simultaneously by adjusting oriented angle (α) along propagation direction. For concept proofs, beams deflection, vortex beam generation, focusing effect demonstrated numerically. provide new possibilities potential develop multifunctional full‐space devices.

Язык: Английский

---

Tri-band terahertz vortex beam generator based on a completely independent geometric phase metasurface

Journal of the Optical Society of America B, Год журнала: 2023, Номер 40(2), С. 441 - 441

Опубликована: Янв. 5, 2023

A vortex beam carrying orbital angular momentum (OAM) is an effective way to increase wireless communication capacity. The existing terahertz (THz) metasurface (MS)-based generator limited operating at a single or two frequency points, and also has wavelength-dependent behavior, thus limiting its application. Here, transmissive MS proposed generate THz beams OAM with different topological charges l = − 1 , 2 3 ( + ) under left/right-handed circular polarization (CP) incidence three frequencies. mode purity of the generated all orders greater than 60% CP wave 0.6 THz, 0.857 1.892 respectively. Both theoretical prediction simulation results verify that designed can independently manipulate waves unit-cell structure preferable for increasing number operation frequencies while guaranteeing manipulation electromagnetic waves. compact system provides ideas fabrication multifunctional MS-based devices higher integration smaller size.

Язык: Английский

---

Four-channel meta-hologram enabled by a frequency-multiplexed mono-layered geometric phase metasurface

Optics Express, Год журнала: 2024, Номер 32(3), С. 4553 - 4553

Опубликована: Янв. 15, 2024

In recent years, frequency-multiplexed metasurfaces have received extensive attention due to the increasing demand for multifunction integration and communication capacity. However, multi-channel studies achieved with a mono-layered metasurface are limited. Herein, universal design strategy geometric phase is proposed by utilizing Pancharatnam-Berry (PB) modulations. The elementary meta-atom judiciously designed transmit cross-polarized component of circularly polarized incident wave at four distinct frequencies independent 360° shifts constant amplitude 0.48, close theoretical limit 0.5. As proof-of-concept demonstration, four-channel meta-hologram achieve holographic images “three foci”, “five “J” “X” 7.2 GHz, 9.1 10.9 15.2 GHz respectively. projected in desired azimuth planes exploiting time-shifting properties Fourier transform. experimental full-wave simulation results good agreement, which indicates that has great potentials various applications, such as imaging information encryption technology.

Язык: Английский

---

Terahertz Transmission‐Type Metasurface for the Linear and Circular Polarization Wavefront Manipulation

Advanced Theory and Simulations, Год журнала: 2022, Номер 5(8)

Опубликована: Июнь 1, 2022

Abstract A transmission‐type metasurface (MS) based on the combined geometric and transmission phase is proposed investigated here numerically, which can achieve independently manipulation of circular polarization (CP) linear (LP) wavefront at terahertz (THz) region. The unit‐cell MS composed dielectric substrate sandwiched with bilayered inner centrosymmetric‐notched‐elliptic (CNE), outer C‐shaped, single‐split‐ring (SSR) structures. convert normal incident LP wave to its orthogonal one lower frequency ( f 1 = 0.68 THz) after left‐handed transmitted right‐handed or vice versa higher 2 1.34 THz). full 2π shifts both CP waves be realized simultaneously by varying opening orientation angles SSR structure angle CNE phase, respectively. As proofs concept, anomalous refraction, planar focusing, vortex beam generation for are demonstrated numerically. These findings show great potential applications in imaging communication systems, providing new possibilities develop multifunctional THz device waves.

Язык: Английский

---