An analytical model for plasmon modes in graphene-coated dielectric nanowire is presented. Plasmon could be classified by the azimuthal field distribution characterized a phase factor exp(imφ) electromagnetic expression and eigen equation of dispersion relation derived. The characteristic tuned changing radius, permittivity chemical potential graphene. proposed provides fast insight into mode behavior nanowire, which would useful applications based on graphene plasmonics cylindrical waveguide.

We propose in this paper a dielectric-graphene-dielectric tunable infrared waveguide based on multilayer metamaterials with ultrahigh refractive indices. The modes different orders are systematically analyzed numerical simulations both structures and effective medium approach. shows hyperbolic dispersion properties from mid-infrared to far-infrared wavelength, which means the mode indices could be supported waveguide. Furthermore, optical of tuned by biased voltages graphene layers. may have...

We propose in this Letter a single-mode graphene-coated nanowire surface plasmon waveguide. The condition and modal cutoff wavelength of high order modes are derived from an analytic model confirmed by numerical simulation. mode number diagram the proposed waveguide wavelength-radius space is also demonstrated. By changing Fermi level graphene, performance could be tuned flexibly, offering potential application tunable nanophotonic devices.

We explore terahertz (THz) orbital angular momentum (OAM) modes supported in multimode Kagome hollow-core fibers. Numerical models are adopted to characterize the effective indices and confinement losses of vector over 0.2-0.9 THz, where two low-loss transmission windows observed. Linearly combining modes, THz OAM states can be generated. Covering a broad bandwidth 0.25 purity values beyond 0.9. Using numerical simulations, fibers with one rings structures also comparably investigated....

We present a method in this Letter to generate optical vortices with tunable orbital angular momentum (OAM) fibers. The OAM vortex is produced by combining different vector modes HE2,meven (HE2,modd) and TE0,m (TM0,m) when l=1 or HEl+1,meven (HEl+1,modd) EHl-1,modd (EHl-1,meven) l>1 π/2 phase shift. can be regarded as result of overlapping two orthogonal beams equal helicity but opposite chirality have experimentally demonstrated the smooth variation from l=-1 l=+1 adjusting polarizer at...

We present the viability of exploiting a current hollow-core photonic bandgap fiber (HC-PBGF) to support orbital angular momentum (OAM) states. The intrinsically provides large refractive index spacing for guiding light, leading OAM transmission with low crosstalk. From numerical simulations, broad OAM±1 mode window satisfied effective separations between vector modes (>10-4) and confinement loss (<3 dB/km) covering 240 nm bandwidth is observed. purity (defined as normalized power weight...

We propose and demonstrate a switchable multiwavelength fiber laser using erbium-doped twin-core (ED-TCF) nonlinear polarization rotation (NPR). The number switchability of lasing wavelengths being switched from 1 to 4 wavelength location could be achieved simultaneously in the proposed configuration with spacing 1.1 nm an optical signal noise ratio (OSNR) larger than 43 dB. output powers at different are nearly same fluctuation less 2 shows good stability shift within 0.01 peak power 5 has...

We propose an effective approach to generate tunable orbital angular momentum (OAM) beam based on all-fiber fused coupler consisting of a single mode fiber (SMF) and two-mode fiber. The fundamental in the SMF is directly coupled LP <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> group (TE xmlns:xlink="http://www.w3.org/1999/xlink">0,1</sub> , HE xmlns:xlink="http://www.w3.org/1999/xlink">2,1</sub> <sup...

This work presents a facile strategy to significantly boost the capacitive performance of aromatic polymer with simple preparation process. At 150 °C, composite films exhibit remarkable comparative performance, U e = 10.1 J cm −3 and η &gt; 90%.

In this paper we propose a graphene plasmons isolator based on non-reciprocal coupling within double layer waveguide structure magneto-optical substrate. The difference in modal indices of opposite directions enables coupling, which is theoretically investigated via coupled mode theory (CMT) and shows good agreement with numerical finite elements methods (FEM). endows such system functionalities as magnetically controlled "plasmons circulator" or isolator". For the latter case, systematical...

We propose in this paper a graphene-coated tapered nanowire probe providing strong field enhancement the infrared regimes. The analytical distributions and characteristic equation of supported surface plasmons mode are derived. Based on adiabatic approximation, analytic methods adopted investigation along region show well consistence with rigorous numerical simulations. Both results have shown that could achieve an order magnitude larger than metal-coated probes. proposed may promising...

A semianalytical method based on the perturbation theory is developed to calculate bending losses of individual modes few-mode fibers (FMFs); it applicable for optical with arbitrary circularly symmetric index profile, especially trench-assisted fibers. The performance step-index FMFs and parabolic-index are investigated three key parameters (i.e., refractive difference trench-cladding, width trench, distance core-trench). Then, a defined estimate FMFs. It shown that changing trench-core,...

We propose to use a 1-atom-thick structure, i.e., single graphene sheet for the dynamic control of an Airy plasmon (AiP). The layer serves not only as guiding medium but also modulator AiP. By altering external biased voltage, effective mode index surface waves can be modified. Consequently, deflection and propagation distance AiP are controlled dynamically. Due advantages plasmons, AiPs may lead compact flexible devices. This paper could beneficial relevant applications such tunable...

A terahertz tunable graphene ribbon-array coupled with a sheet absorber, which has the near-unity absorption and wide bandwidth, is proposed studied in this letter. The structure can strongly trap incident wave enhance its absorption. By optimizing parameters of structure, perfect over 99.99% be achieved numerically far infrared region. peaks modulated by adjusting chemical potentials graphene. We also investigate variation absorber varying parameters. Furthermore, geometry very simple, so...

In this paper, we propose magnetically-controlled logic gates of graphene plasmons based on non-reciprocal coupling within the multilayer waveguide structure. The magnetooptical effect semiconductor substrate leads to difference in modal indices opposite directions and coupling, which is investigated by both coupled mode theory (CMT) finite elements methods (FEM). Such a mechanism enables design magnetically- controlled NOT gate, whose output can be inversed reversing propagation directions....

In this paper we propose a method of unidirectional excitation graphene plasmons via metal nanoantenna arrays and reveal its application in circular polarization analyzer. For pairs with orthogonal orientations, the are excited through antenna resonances direction propagation can be controlled by incident polarization. On other hand, based on spiral shape distribution arrays, analyzer obtained interaction geometric phase effect chirality carried By utilizing plasmons, extinction ratio...

We conduct both analytical and numerical investigations of the giant gradient force for nanoparticle trapping in coupled graphene strips waveguides system. An model based on slab has been adopted analysis mode performance force, good agreement is obtained with simulations. Both theoretical modeling simulations have shown that can be as high 8 nN/μm· mW at a gap size 10 nm, which least one order magnitude higher than previously reported hybrid plasmonic waveguide. Meanwhile, leads to an...