In order to improve the refractive index sensitivity of a localized surface plasmon resonance (LSPR) sensor, we present new type LSPR sensor whose can be improved by greatly increasing wavelength red-shift metal-semiconductor core-shell nanoparticles (CSNs). Using extended Mie theory and Au@Cu2-x S CSNs, theoretically investigate optical properties CSNs in entire near-infrared band. Compared with dielectric-metal metal-metal under same conditions, have higher double-exponential curve because...

Based on the theory of surface plasmon polaritons (SPPs), a metal–insulator–metal (MIM) waveguide structure consisting streamlined resonant cavity and baffle is proposed. When incident light waves enter into structure, through interaction between three discrete states continuous state by baffle, sharp asymmetric Fano resonance spectra can be formed. The transmission spectrum characteristics are simulated analyzed finite element method (FEM), effects parameters refractive index studied. By...

A voltage tunable filter based on a combined metal-insulator-metal nano-cavity waveguide of organic electro-optical material DAST is proposed by using the side-coupled method. The structure this kind consists two Y-type cavities and rectangular waveguide. transmission spectra, resonance wavelength, magnetic field distribution asymmetric cavity has been calculated analyzed finite element numerical simulation results show that features smooth flat passband with maximum 0.97, stopband minimum...

A stepped graphene metamaterial terahertz absorber is proposed to achieve wideband absorption characteristics. By etching the rectangular groove on surface of and dynamically adjusting length width groove, we improved absorptivity up 0.9475 obtained a broadband band 5.885 THz. In addition, has characteristics electrical tunability, polarization independence, large angle absorption, which improve utilization light waves. The absorbers in this paper have potential applications fields stealth...

A novel structure of bimetallic silver/gold layer (gold as the outer layer) dielectric-loaded surface plasmon polariton waveguides is proposed. The field distribution, mode effective index, propagation distance and lateral confinement fundamental supported by this are calculated at telecommunication wavelength; effect total metal thickness ratio also analyzed. It found that, compared with conventional single-gold-film waveguides, exhibits almost 54% increase distance. Under same condition...

A compact dual-band bandpass filter (DB-BPF) is studied and implemented by using shorted stub-loaded stepped impedance resonator (SSL-SIR) 0∘∘feed structure in this paper. The resonance frequencies of SSL-SIR can be analyzed explained odd−-even mode analysis method it used the design BPF I. Then, II created theory structure. Finally, two structures are combined together to form a DB-BPF reasonably adjusting coupling between them position feed points. simulation results suggest that center...

In this paper, a filtering antenna based on metasurface is designed using slot-coupled feeding, and the unit fractal pattern. Replacing rectangular patch with can introduce radiation zero point upper sideband of antenna, thereby enhancing selectivity. addition, current reversed by loading shorting pin, also introduced in lower sideband. After measurement, -10 dB impedance bandwidth 23.6% (3.22-4.08 GHz), average gain passband 8.1 dBi. The does not involve an additional filter circuit, has...

Abstract This paper proposes a frequency selective absorber with notch reflection band. It consists of lossy layer and metal ground. The is composed the octagonal ring meander‐line resonators connected in parallel on same plane, which are used to obtain wide absorption band band, respectively. simulation results show that there two bands from 2.22 6.8 GHz 7.94 8.54 GHz, −3dB 7.14 7.68 GHz. Moreover, also has characteristics compact structure, polarization‐independent, angular stability....

A multilayered dual-band frequency selective surface (FSS) with high selectivity is proposed in this paper. The unit cell of the presented FSS a five-layered structure surrounded by thin metal waveguide and has very small thickness. electromagnetic coupling improved multilayer structure, which improves FSS. Simulation results show that dual-bandpass exhibits sharp roll-off characteristics out-of-band suppression, are due to introduction three transmission zeros. designed can achieve stable...

A multi-band filter based on Sherpinski fractal is presented. The has certain advantages in size and frequency band characteristics, the working covers L band, S C band. It consisted by stepped appearance triangular patches. Through simulation analysis, S-parameters of no fractal, first-order second-order are compared turn, effect structure can be seen. introduced ultra-wideband, miniaturization achieved, which improve insertion loss, return bandwidth reduce resonant frequency. After...

A Metal-Insulator-Metal (MIM) voltage tunable filter based on the Aperture-coupled method is proposed, which consists of two micro-ring resonators filled with organic Electro-Optical materials DAST and a rectangular waveguide. The transmission spectrum, resonance wavelength distribution curves magnetic field asymmetric cavities waveguide structure have been calculated analyzed by finite element numerical simulation method. results show that has feature smooth wide passband bandwidth (Full...

A compact patch ultra-wideband (UWB) antenna with a novel fractal structure is proposed in this paper. The shape of the based on hexagonal ring. Minkowski fractals and Koch are used for outer inner edges ring, respectively. Thus, size reduction bandwidth increase achieved. final covers wide frequency range 2.7GHz to 8.75GHz at 35.5mm × 34mm. By comparing results using respectively, advantages combined paper further clarified. Optimize effect UWB by adjusting ground plane. Through actual...

In this paper, a 5G dual-band multiple-input multi-ple-output (MIMO) antenna array based on the pattern phase diversity technology is proposed. Total area of only about 32% normal mobile phone (150 x 70 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ). From simulation results, we can see that achieves S11 <; -6 dB at 3.245-3.85 GHz and 4.67-5.14 GHz. Besides, isolation between all ports more than 20 dB, envelope correlation...

Recently developed achromatic metalens show great potential to replace conventional lenses. However, current long-wavelength infrared (LWIR) are limited fixed functions,severely hampers their integration and application. In order address this limitation, Ge2Sb2Se4Te1(GSST) Silicon (Si) were used as materials for continuously variable focus height broadband (CVFHBAM) at LWIR. Specifically, the multipole decomposition is performed within operating band 8-12 um avoid undesired resonances ensure...

A metal-insulator-metal voltage tunable filter based on organic electro-optical materials DAST is proposed by using the side-coupled method. The structure consists of two H-type cavities and a rectangular waveguide. transmission spectra, resonance wavelength distribution curves magnetic field asymmetric have been calculated analyzed finite element numerical simulation results show that has feature smooth wide bandwidth (full width at half maxima achieved 754 nm). And transmittance passband...

In this paper, a terahertz absorber based on monolayer graphene is proposed. This consists of and micro-nano structure which composed gold layer silicon dioxide-silicon layer. The combination the simple makes easy to fabrication in engineering. introduction also enhances coherent superposition incident reflected light results significant increase absorption proposed absorber. can achieve perfect absorption. When thicknesses gold, dioxide are set 5 um, 5.4 2.3 um respectively, at same time...