We demonstrate that a broadband terahertz absorber with near-unity absorption can be realized using net-shaped periodically sinusoidally-patterned graphene sheet, placed on dielectric spacer supported metallic reflecting plate. Because of the gradient width modulation unit continuous plasmon resonances excited, and therefore achieved. The results show absorber's normalized bandwidth 90% absorbance is over 65% under normal incidence for both TE TM polarizations when chemical potential set as...

In this paper, we propose and demonstrate a switchable terahertz metamaterial absorber with broadband multi-band absorption based on simple configuration of graphene vanadium dioxide (VO 2 ). The functional characteristics the can be achieved by changing phase transition property VO . When is insulating, device acts as absorbance greater than 90% under normal incidence from 1.06 THz to 2.58 THz. exhibits excellent performance wide range incident polarization angles for TE TM polarizations....

In this paper, a graphene-based hybrid plasmonic waveguide is proposed for highly efficient broadband surface plasmon polariton (SPP) propagation and modulation at midinfrared (mid-IR) spectrum.The composed of monolayer graphene sheet in the center, polysilicon gating layer, two inner dielectric buffer layers outer parabolic-ridged silicon substrates symmetrically placed on both sides graphene.Owing to unique structure, light-graphene interaction subwavelength SPPs confinement fundamental...

We propose and numerically demonstrate high Q-factor sensors based on all-dielectric metasurfaces, which are very sensitive to the change of refractive index surrounding media incident angle. By using light angular scanning method, metasurface symmetric tetramer can act as an excellent sensing platform for trace-amount molecules such protein A/G, 2, 4-DNT, 2D material graphene with huge absorbance enhancement in mid-infrared broadband spectrums. The results reveal that envelope amplitudes is...

We demonstrate an efficient back-fire to forward wide-angle beam steering leaky-wave antenna (LWA) based on a large dispersion gradient planar spoof surface plasmon polariton (SSPP) transmission line (TL) with split-ring units. To convert the highly confined SSPP waveguiding mode radiation mode, two arrays of metallic patches are periodically arranged both sides TL. The designed as combined half-elliptical shapes mitigate open stopband effect and enhance performance. propose theoretical...

Formamidinium (FA)-based 2D perovskites have emerged as highly promising candidates in solar cells. However, the insertion of spacer cations into perovskite lattice concomitantly introduces microstrain and unfavorable orientations that hinder efficiency stability. In this study, by finely tuning FA-based through cation engineering, a stable structure with balanced distortion, relaxation, reduced carrier-lattice interactions is achieved. These advancements effectively stabilize inherently...

The narrowband meta-absorbers exhibit significantly enhanced electromagnetic confinement capabilities, showcasing broad application prospects in sensing fields. They can be applied for biomarker detection, chemical composition analysis, and monitoring of specific gas the environment. In this work, we propose a 3D meta-absorber with an out-of-plane plasma mechanism based on two-photon printing system. Compared to conventional fabrication metal-insulator-metal 2D meta-absorber, absorber is...

We numerically demonstrate a broadband terahertz (THz) absorber that is based on hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design made up single-layer periodically arranged hybrid square/disk/loop patterns multilayer structure. find absorption 90% absorbance the fractional bandwidth 84.5% from 1.38 THz to 3.4 can be achieved. Because axisymmetric configuration, demonstrates absolute independence for...

We demonstrate a variety of high performance broadband optical waveguide modulators using strongly coupled hybrid graphene and metal nanoribbons for near-infrared applications.

Abstract Whispering-gallery-mode (WGM) cavity is important for exploring physics of strong light-matter interaction. Yet it suffers from the notorious radiation loss universally due to light tunneling effect through curved boundary. In this work, we propose and demonstrate an optical black hole (OBH) based on transformation optics. The all WGMs in ideal OBH completely inhibited by infinite wide potential barrier. Besides, WGM field cladding revealed follow $$1/r^\alpha$$ <mml:math...

We numerically simulate novel planar plasmonic waveguides and notch filters with excellent guiding rejection of terahertz (THz) waves super subwavelength confinement. Our design is based on spoof surface plasmon polaritons—surface polaritons a frequency that has been tuned using patterned conductive surfaces. find by patterns periodically arranged spiral-shaped units, the dispersion characteristics can be engineered at will tuning parameters spirals. resulting have much lower asymptotic...

Modulating spatial near-infrared light for ultra-compact electro-optic devices is a critical issue in optical communication and imaging applications. To date, modulators based on graphene have been reported, but they showed limited modulation effects due to the relatively weak light-graphene interaction. In combination with metallic nanoslits, we design kind of ultrathin perfect absorber enhanced independence wide range incident angles. The modulated spectral shift central wavelength up...

Enhancing the light–matter interaction of graphene is an important issue for related photonic devices and applications. In view its potential ultraviolet applications, we aim to achieve extremely high absorption in without any nanostructure or microstructure patterning. By manipulating polarization angle incident light, power can be sufficiently coupled optical dissipation based on single-channel coherent perfect optimized multilayered thin film structure. The absorbance ratios single four...

We propose a tunable dual-band reflective cross-polarization converter composed of periodically arranged single layer U-shaped graphene nanostructures in mid-infrared region. The proposed can convert the polarization state an incident wave from linear to its cross at operating frequencies 34.67 and 44.13 THz with high-efficiency conversion ratio (PCR) approaching 100%. Furthermore, as complementary structure, hollow-carved sheet shows broadband performance bandwidth 1 PCR over 90%. this be...

In this paper, we numerically and experimentally demonstrate a substrate integrated plasmonic waveguide (SIPW) concept its application in microwave bandpass filters. This SIPW consists of double arrays slots etched on the top bottom metal layers (SIW) to support spoof surface plasmon polariton (SSPP) modes with low high cutoff frequencies. The simulated results show that by tuning parameters SIPW's unit cell, dispersion characteristics can be engineered at will. Then, propose sharp roll-off...

Ultra-wideband spoof surface plasmon polaritons (SSPPs) based on compact balanced coplanar stripline (CPS) waveguides are proposed. Compared with the conventional CPS-based terahertz (THz) SSPP unit cell, proposed one has achieved a size reduction of 55.2% under condition same asymptotic frequency. The propagation and attenuation characteristics waveguide can be easily manipulated by adjusting geometry dimensions cell. It indicates that cut-off frequency its tunable flexibility thereby...

We demonstrate a new variety of spoof surface plasmon polariton (SSPP) waveguides and notch filters with periodic arrays ultra-thin metallic meander-strip units for high-efficiency strong confinement microwave SSPPs transmission rejection. Firstly, the dispersion characteristics proposed waveguide based on are investigated. The curve presents unique negative group velocity characteristic, asymptotic frequency greatly reduces to near half as that SSPP traditional rectangular-grooved same...

High quality ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula> )-factor metamaterial absorbers are an emerging technology, which can be used in refractive index sensing for dielectric coating and radar cross Section (RCS) reduction concealment of object. Nevertheless, angular-sensitive or the required complex structure hampered its application. Here, a absorber based on...

Chirality (C) is a fundamental property of objects, in terms symmetry. It extremely important to sense and distinguish chiral molecules the fields biochemistry, science, medicine. Vibrational circular dichroism (VCD) spectroscopy, obtained from differential absorption left- right- circularly polarized light (CPL) infrared range, promising technique for enantiomeric detection separation. However, VCD signals are typically very weak most small molecules. Dielectric metasurfaces an emerging...

This letter presents a wideband circularly polarized (CP) antenna with filtering radiation response based on slot-patch structure. The proposed CP is composed of top patch, middle microstrip-to- ("+"-shape) slot structure, and bottom metallic reflector. layer not only functions as slot-coupled feeding structure but also operates driven antenna. layers are used to reduce the backside enhance axial ratio (AR) bandwidth. In addition, diagonal etched patch an additional E-shaped can generate...

Abstract We demonstrate a novel route to achieving highly efficient and strongly confined spoof surface plasmon polaritons (SPPs) waveguides at subwavelength scale enabled by planar staggered plasmonic (PSPWs). The structure of these new consists an ultrathin metallic strip with periodic double groove arrays supported flexible dielectric substrate, leading unique EM coupling waveguiding phenomenon. SPP propagation properties, including dispersion relations near field distributions, are...

We numerically demonstrate a switchable broadband terahertz spatial modulator composed of ginkgo-leaf-patterned graphene and transition material vanadium dioxide (VO 2 ). The phase property VO is used to switch the from absorption mode transmission mode, behaves as dynamically adjustable for large scale transmittance modulation. When in metallic state Fermi energy set 0.8 eV, proposed absorber with absorbance over 85% 1.33 2.83 THz. By adjusting level 0 peak can be continuously tuned 24.3%...

We proposed a new variety of substrate integrated plasmonic filters (SIPFs) with multiple passband characteristics based on the concept spoof surface plasmon polaritons (SSPPs). By etching periodic interdigital structure array top metal layer waveguide (SIW), we can achieve high-efficiency microwave SSPP transmission an insertion loss 1 dB in 7.4-12.5 GHz, and high rejection level 27 bands. introducing antisymmetric C-ring resonators (ASCRs) filter structure, number bandwidth be flexibly...

Chirality (