In this paper, a double V-shaped metasurface that can efficiently convert linear polarizations of electromagnetic (EM) waves in wideband is proposed. Based on the electric and magnetic resonant features single particle, four EM resonances are generated pair, leading to significant bandwidth expansion cross-polarized reflections. The simulation results show proposed able linearly polarized into ultrawideband from 12.4 27.96 GHz, with an average polarization conversion ratio (PCR) 90%....

In this paper, we propose dynamically tunable plasmon induced transparency (PIT) in a graphene-based nanoribbon waveguide coupled with graphene rectangular resonators structure on sapphire substrate by shifting the Fermi energy level of graphene. Two different methods are employed to obtain PIT effect: one is based direct destructive interference between radiative state and dark state, other indirect coupling through waveguide. Our numerical results reveal that high tunability window can be...

The demand for optically transparent microwave absorbers has attracted increasing interest among researchers in recent years. However, integrating broadband absorption and high optical transparency remains a challenge. This report demonstrates scheme absorbers, featuring 90% bandwidth of 10 GHz covering frequency range 25.2-35.2 compatibility with good wide band from the visible to infrared. absorber is based on Jaumann structure composed two graphene sheets sandwiched by dielectric backed...

In this paper, we report the design, fabrication, and characterization of a tungsten-based metamaterial selective solar absorber (SSA) combining metal-insulator-metal (MIM) structure simple nanodisk array. The as-fabricated absorbs strongly selectively in wavelength range 0.5-1.75 μm with characterized absorptance more than 90%, which drops abruptly to less 12.6% beyond 2.5 μm. addition, broadband highly is polarization-insensitive under incidence normal plane waves. Moreover, selectivity...

Machine learning and optimization algorithms have been widely applied in the design for photonics devices. We briefly review recent progress of this field research show data-driven applications, including spectrum prediction, inverse performance optimization, novel graphene metamaterials (GMs). The structure GMs is well-designed to achieve wideband plasmon induced transparency (PIT) effect, which can be theoretically demonstrated by using transfer matrix method. Some traditional machine...

We demonstrate that slow light with large group-index, wideband, and low dispersion can be realized in a silicon-on-insulator W1-type photonic crystal waveguide by simply shifting the first two rows of air-holes adjacent to specific directions. Keeping group index at 46, 60, 86, 111, 151, 233, respectively, while restricting its variation within ± 10% range, we accordingly obtain bandwidth 9.0 nm, 6.7 4.6 3.3 2.4 1.7 respectively. The normalized delay-bandwidth product keeps around 0.25 for...

Ultrafast and low-power dynamically tunable single channel multichannel slow light based on plasmon induced transparencies (PITs) in disk resonators coupled to a metal-dielectric-metal (MDM) waveguide system with nonlinear optical Kerr medium is investigated both numerically analytically. A coupled-mode theory (CMT) introduced analyze this structure. Multichannel realized plasmonic structure bright–dark mode coupling mechanism. In order reduce the pump intensity obtain ultrafast response...

Magnetic localization is an effective method for obtaining the pose of a wireless capsule endoscope (WCE) because it able to provide position and orientation magnet in places where visual methods are not available. In magnetic positioning, dipole model often used calculate field source. However, calculated by introduces positioning errors when permanent as source size cannot be ignored. this paper, WCE was proposed based on combination analytical model. A cylindrical mounted WCE. The using...

In this article, we propose a graphene metamaterial coupled with metallodielectric grating (GMCMG) structures to achieve plasmon induced reflection effects in the spectrums. order enhance light-matter interaction graphene, micro-genetic algorithm is applied performance optimization for GMCMG. Due absorption enhancement of and inverse design photonic structures, perfect absorber an efficient third harmonic generator are obtained by employing optimized GMCMG structures. Compared previous...

A novel metallodielectric grating coupled with graphene metamaterials (MGCGM) structure is proposed to achieve the tunable plasmon induced transparency (PIT) effect. Two different mechanisms are employed explain PIT effect in reflection spectrum: one originated from destructive interference between plasmonic modes and hybrid mode dielectric layer, other related absorption of surface plasmons. The simulated results indicate high tunability amplitude operating wavelength can be obtained by...

In this letter, all-optical dynamically tunable triple plasmon-induced transparency responses are proposed in an ultracompact plasmonic structure, which comprises dual T-shaped resonators side-coupled to a metal–insulator–metal waveguide the near infrared range. High tunability magnitudes of optical channel 1 and 3 can be achieved, when is filled with nonlinear Kerr material, while that 2 remains same approximately. It also possible realize low-power central wavelengths channels, covered by...

Current wireless capsule endoscopy (WCE) is limited in the long examination time and low flexibility since passively moved by natural peristalsis. Efforts have been made to facilitate active locomotion of WCE using magnetic actuation localization technologies. This work focuses on motion control robotic under a complex gastrointestinal (GI) tract environment order improve efficiency accuracy its dynamic, environments. Specifically, system based four-electromagnetic coil module designed,...

In this study, we propose a new type of slow light photonic crystal waveguide structure to achieve wideband with low dispersion. The is based on triangular lattice ellipse-hole imposed simply by selective altering the locations holes adjacent line defect. Under constant group index criterion ±10% variation, when indices are nearly constants 54, 69, and 80, their corresponding bandwidths flat band reach 12.7, 10.0, 8.6 nm around 1550 nm, respectively. A large index-bandwidth product 0.44...

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

This study presents a closed-loop magnetically driven laser steering manipulator positioning system for endoscopic microsurgery. A multimagnetic field strength sensor circuit is embedded in 16−mm diameter analog manipulator. The magnetic distribution of cylindrical permanent magnet three-dimensional space first modeled using an integral model to overcome the large error induced by dipole when and are close. then decomposed Gauss–Legendre quadrature improve computational efficiency...

A polarization-independent metamaterial near-perfect absorber is numerically studied in the infrared range a two-perpendicular-nanorod design. It shown that absorptance and peak wavelength associated with magnetic resonance are sensitive to nanorod length, thickness, refractive index of spacer, while only being slightly affected by period distance between neighboring nanorods. This design shows two absorption peaks values 89% 83% at wavelengths 1.24 1.46 μm, respectively. Furthermore, show...

We theoretically and numerically investigate a low-power, ultrafast, dynamic all-optical tunable plasmonic analog to electromagnetically induced transparency (EIT) in two nanodisk resonators side-coupled metal-insulator-metal waveguide system. The optical Kerr effect is enhanced by the slow light of EIT-like based on graphene-Ag composite material structures with giant effective nonlinear coefficient. modulation method applied improve tuning rate response time subpicoseconds or even...