An exact solution is obtained for the electromagnetic field due to an electric current in presence of a surface conductivity model graphene. The graphene represented by infinitesimally-thin, local and isotropic two-sided surface. terms dyadic Green's functions as Sommerfeld integrals. plane-wave reflection transmission presented, wave propagation along studied via poles For isolated characterized complex conductivity, proper transverse-electric (TE) exists if only imaginary part positive...

Dyadic Green's functions are presented for an anisotropic surface conductivity model of biased graphene. The graphene can be using either a perpendicular static electric field, or by magnetic field via the Hall effect. is represented infinitesimally-thin, two-sided, non-local surface, and obtained in terms Sommerfeld integrals. role spatial dispersion accessed, effect various bias fields on electromagnetic behavior examined. It shown that varying one exert significant control over graphene's...

Fundamental properties of dipole transmitting antennas formed by carbon nanotubes are investigated. Since can be grown to centimeter lengths, and since they metallic, the as antenna elements fundamental interest. In this paper, nanotube investigated via a classical Hallen's-type integral equation, based on quantum mechanical conductivity. The input impedance, current profile, efficiency presented, radiation pattern is discussed, possible applications.

A model is developed for a parallel-plate waveguide formed by graphene. The graphene represented an infinitesimally thin, local two-sided surface characterized conductivity obtained from the Kubo formula. Maxwell’s equations are solved fields guided layers. It shown that despite extreme thinness of its walls, can guide quasi-transverse electromagnetic modes with attenuation similar to structures composed metals, while providing some control over propagation characteristics via charge density...

Motivated by the recent emergence of a new class anisotropic 2D materials, we examine their electromagnetic modes and demonstrate that broad materials can host highly directional hyperbolic plasmons. Their propagation direction be manipulated on spot gate doping, enabling beam reflection, refraction, bending. The realization these natural media opens up avenue in dynamic control plasmons not possible 3D version.

Here, we report on the transmissivity of electromagnetic waves through a stack monolayer graphene sheets separated by dielectric slabs at low-terahertz frequencies. It is observed that multilayer structure possesses band-gap properties and supports series bandpass band-stop regions, similar to cases stacked metallic meshes microwave/THz frequencies metal-dielectric optical The transmission resonances in region are identified as coupled Fabry-P\'erot associated with individual cavities loaded...

Analytical expressions are presented for the intraband conductivity tensor of graphene that includes spatial dispersion arbitrarily wave-vector values and presence a nonzero Fermi energy. The elements derived from semiclassical Boltzmann transport equation under both relaxation-time approximation Bhatnagar-Gross-Krook model (which allows an extra degree freedom to enforce number conservation). based on linear electron near Dirac points, extend previous results assumed small values; these...

We report on the dual nature (capacitive and inductive) of surface impedance periodic graphene patches at low-terahertz frequencies. The transmission spectra a graphene-dielectric stack shows that patterned exhibits both low-frequency (capacitive) passband metal patch arrays higher-frequency (inductive) aperture in single tunable configuration. analysis is carried out using transfer-matrix approach with two-sided boundary conditions, results are verified full-wave numerical simulations. In...

The properties that quantify photonic topological insulators (PTIs), Berry phase, connection, and Chern number, are typically obtained by making analogies between classical Maxwell's equations the quantum mechanical Schr\"{o}dinger equation, writing both in Hamiltonian form. However, aforementioned quantities not necessarily nature, for systems they can be explained using only concepts. Here we provide a derivation description of PTI equations, demonstrate how an electromagnetic mode acquire...

Black phosphorous (BP) is a well-known two-dimensional van der Waals (vdW) material with in-plane anisotropy and remarkable electronic optical properties. Here, we comprehensively analyze the near-field radiative heat transfer (NFRHT) between pair of parallel non-rotated BP flakes that occurs due to tunneling coupled anisotropic surface plasmon polaritons (SPPs) supported by flakes. It demonstrated covering hexagonal boron nitride (hBN) films leads hybridization BP's SPPs hBN's hyperbolic...

We study the electromagnetic response and surface modes in a generic gapped Dirac material under pumping with circularly polarized light. The valley imbalance due to leads net Berry curvature, giving rise finite transverse conductivity. discuss appearance of nonreciprocal chiral edge modes, their hybridization waveguiding nanoribbon geometry, giant polarization rotation arrays.

We theoretically study the Casimir-Polder force on an atom in a arbitrary initial state rather general electromagnetic environment wherein materials may have nonreciprocal bianisotropic dispersive response. It is shown that under Markov approximation has resonant and nonresonant contributions. obtain explicit expressions for optical both terms of system Green function modes. apply theory to particular case two-level interacts with topological gyrotropic material, showing nonreciprocity...

The characteristics of armchair carbon nanotube dipole antennas are investigated in the infrared and optical regime. analysis is based on a classical electromagnetic Halleacuten's-type integral equation, an axial quantum mechanical conductance function for tube. It found that, within certain frequency span GHz-THz range, finite-length dipoles resonate at approximately integer multiples one-half plasma wavelength. Outside this current resonances strongly damped. In regime, antenna properties...

The current on an infinitely-long carbon nanotube (CN) antenna fed by a delta-gap source is studied using Fourier transform technique. CN modeled as infinitely-thin tube characterized semi-classical conductance, appropriate for the frequencies of interest considered in this work. CN's compared with solid and tubular copper antennas having similar or somewhat larger radius values. It found that values scale nanometers, CNs exhibit smaller losses than cylindrical same dimensions, assuming bulk...

Excitation of the discrete (surface-wave/plasmon propagation mode) and continuous (radiation modes) spectrum by a point current source in vicinity graphene is examined. The represented an infinitesimally thin, local, isotropic two-sided conductivity surface. dynamic electric field due to obtained complex-plane analysis Sommerfeld integrals, decomposed into physically relevant contributions. Frequencies considered are GHz through mid-THz range. As expected, TM surface wave (surface plasmon)...

We report on the absorption of electromagnetic radiation by metallic nanoparticles in radio and far infrared frequency range, subsequent heating nanoparticle solutions. A recent series papers has measured considerable (RF) gold In this work, we show that claims RF are not supported theory. analyze several mechanisms which nonmagnetic can absorb low radiation, including both classical quantum effects. conclude none these mechanisms, nor any combination them, increase temperatures at rates...

A graphene sheet gated with a ridged ground plane, creating soft-boundary nanoribbon, is considered. By adjusting the ridge parameters and bias voltage channel can be created on which guide transverse magnetic surface plasmon polaritons. Two types of modes are found; fundamental higher-order no apparent cutoff frequency energy distributed over channel, edge concentrated at edge. Dispersion curves, electric near-field patterns, current distributions these determined. Since location where in...

Light-matter interactions in conventional nanophotonic structures typically lack directionality. Furthermore, surface waves supported by material substrates do not usually have a preferential direction of propagation, and their wavefront tends to spread as it propagates along the surface, unless or excitation are properly engineered structured. In this article, we theoretically demonstrate possibility realizing \emph{unidirectional diffractionless surface-plasmon-polariton modes} on...

At microwave and far-infrared frequencies, the radiation efficiency of a wire antenna with radius value smaller than few hundred nanometers is very low, due to large impedances associated high ohmic losses. However, continued miniaturization electronic devices, nano-radius interconnects antennas are desirable. In this work, relationships among radius, conductivity, frequency, loss examined for dipole antennas. Simple formulas derived distributed resistance, effective required achieve desired...

An analytical model is presented for the analysis of multilayer wire media loaded with 2-D arrays thin material terminations, characterized in general by a complex surface conductivity. This includes cases resistive, metal, or graphene patches and impedance ground planes. The based on nonlocal homogenization additional boundary conditions (ABCs) at connection (resistive) material. Based charge conservation, new ABCs are derived interface two uniaxial mediums imperfect conductors junction. To...