We present a hybrid coupling scheme of magnetic toroidal and electric dipole metasurface with suppressed radiation loss, which can produce the tunable plasmon-induced transparency (PIT) an enhanced slow-light effect in terahertz regime. The is constructed by nesting dual-split ring resonator (DSRR) inside (RR) to exploit destructive coherence electromagnetic mode at PIT resonance. polarization-dependence excitation performs active tunability PIT-induced group slowing down rotating...

We propose an ultrathin terahertz waveplate of bi-layer chiral metamaterial for cross-polarization conversion at asymmetric transmission. The is constructed with hybrid coupling plasmonic resonators a concentric ring and double-split ring. can efficiently convert the ${y}$y-polarized wave into ${x}$x-polarized cross-polarized transmittance over 97% polarization ratio 99% in simulation. transmission parameter, defined by difference between two opposite propagating transmittances, be as high...

Composite structures integrated with metasurfaces and nonlinear films have emerged as alternative candidates to enhance response. The cooperative interaction between the two components is complicated. Herein, a split-ring resonator (SRR)-type metasurface was fabricated on free-standing nanocrystal diamond (NCD) film utilizing electron beam lithography, evaporation, lift-off process. terahertz (THz) radiation from SRR-NCD under normal incidence originates high-order magnetic resonance of SRR...

Abstract Active control of metamaterial properties in stretchable devices is crucial for advanced terahertz (THz) applications, involving large mechanical deformation or stretching. Single/double-layer mechanically tunable THz based on the polymer polydimethylsiloxane are proposed and experimentally studied herein. The plasmon-induced transparency (PIT) effect observed transmittance spectrum single-layer metamaterial, originating from near-field coupling two bright modes. Similarly, a...

Manipulating the polarization state of terahertz waves is critical for communication systems. This study proposes a band conversion metasurface based on dislocation-induced anisotropy. Numerical simulation results revealed that orthogonal linearly polarized light, circularly light to and can be realized. Furthermore, multifunctional could achieved by various structures bilayer metasurface. Thus, proposed design generalized. The exhibits considerable potential applications in communications.

Plasmon-induced transparency (PIT) metasurfaces have emerged as a promising platform for applications in ultrasensitive detection and slow-light devices. The active control of PIT is particularly crucial advancing these applications. In this study, we integrate the phase change material Ge2Sb2Te5 (GST) into structural design polarization-independent metasurface, enabling experimental realization ultra-large depth modulation peaks. This was achieved through direct thermal activation sample...

A tunable polarization-independent plasmon-induced transparency (PIT) metasurface based on connected half-ring and split-ring resonators is proposed to working in the terahertz band. We analyze PIT effect metasurfaces comprising of ring resonator split resonator. Due magnetic attenuation caused by reverse current between two resonators, relative position greatly affects strength effect. Magnetic weakens dark mode Through simulation experiment, it found that connecting can avoid achieve a...

A flexible terahertz metamaterial is designed to control the transmittance through an external electric field. Two different metallic structures, split ring (type I structure) and inside a II structure), were prepared voltage was applied forked finger electrode. The structures wrapped in thin film made by mixing strontium titanate nanopowder with polyimide certain ratio. Under normal incidence, controlled applying adjust imaginary part of permittivity titanate. modulation depth type...

As one of the main ways to transport natural gas, pipeline safety is great significance maintaining social stability and ensuring national energy supply. Aiming at safe operation gas pipelines in subsidence areas coal mine, this work proposes a management system for condition monitoring control. This contains three technical modules: surface displacement monitoring, risk assessment index system, early warning model. Firstly, collected data site topography conditions are transmitted database...

Tunable metasurfaces offer a promising avenue for dynamically modulating terahertz waves. Phase-change materials are crucial in this dynamic modulation, enabling precise and reversible control over the electromagnetic properties of metasurfaces. In study, we designed experimentally fabricated tunable lattice-induced transparent metasurface. This metasurface comprises two gold rod resonators exhibiting different periodic distributions, each supporting an electric dipole resonance at 2.03 THz...

The local wavefront modulation technique in the terahertz band is an important basis for development of technology. Here, electrically controlled convergent tunable device based on patterned transparent electrode poly (3, 4-ethylenedioxythiophene): (styrene sulfonate) (PEDOT: PSS) realized to locally tune wavefront. consists two substrates with circular-hole electrodes and liquid crystal sandwiched between them. refractive index gradient can be generated by coaxial double-hole electrodes,...

Frequency-induced instability is widely present in nematic liquid crystals (LCs), which poses a problem improving liquid-crystal-based phase-shift devices driven by alternating currents. Herein, the Fréedericksz transition of thick LCs was investigated under electric fields to reveal suppression frequency-induced low frequency range. By extending Frank-Leslie equation AC-driven case, response LC numerically calculated, and threshold for suppressing estimated conjunction with perturbation...

In this paper, the transportation economy of two heated crude oil pipelines laid in one ditch is analyzed by taking into account influence operating temperature, interval between pipelines, and distance heating stations on energy consumption. To analyze economy, are simulated under four conditions based an unstructured finite volume method. Compared with laying separately ditches, results attest notably higher soil meaning reduced heat dissipation each pipeline ditch. It inferred that for...

Terahertz (THz) quasi-optical devices are typically used for realizing THz full-band modulation. However, the development of electronically controlled is limited by inadequate transparent electrode materials and inefficient processing technology. In this study, we introduced a novel scheme based on poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) film devices. The ultraviolet (UV) lithography lift-off process manufacturing patterned electrodes. Combined with birefringence...