Article history: Received 29 August 2017 Accepted 17 September 2017 Available online 25 September 2017 Editor: M. Trodden We calculate the absorption cross section for planar waves incident upon Kerr black holes, and present a unified picture for scalar, electromagnetic and gravitational waves. We highlight the spin-helicity effect that arises from a coupling between the rotation of the black h...

The core theorem on which the above paper is centred—that a perfectly conducting body of revolution absorbs no angular momentum from an axisymmetric electromagnetic wave field—is in fact a special case of a more general result in electromagnetic scattering theory. In addition, the scaling of the efficiency of transfer of angular momentum to an object with the wavelength and object size merits f...

This paper analyzes an electromagnetic model of radar-absorbing layered structures for several stacking sequences of a woven glass/vinyl ester laminate, foam layers, and resistive sheets. It considers configurations that are either deposited on different backing materials or embedded in a laminated sandwich plate. Through-the-thickness layer dimensions and sheet resistances offering the best si...

When the electromagnetic field couples to the electric dipole moment of the Continuation of lecture 13 11/5/09 region under consideration, we see that the absorption spectrum, except for simple frequency-dependent factors, is proportional to the Fourier transform of the correlation function of the dipole moment. Using the methods we have been discussing, that correlation function can be written as

Cylindrical electromagnetic waves have been examined mostly with a radiation condition applied at the radial far field. In modern optical technology, there are however growing number of applications where both radiation and absorption of energy should be taken into account. In order to illustrate the ramifications of such energy balance, we take plasmonic waves propagating around a metallic nan...

Collisional absorption of dense fully ionized plasmas in strong laser fields has been investigated using molecular dynamics simulations [1, 2, 3]. The external electric field was implemented as a homogeneous linearly polarized harmonic field. The main difficulty in order to simulate a fully ionized plasma is to model the attractive electron–ion interaction: the pure Coulomb potential has a sing...

The core theorem on which the above paper is centred—that a perfectly conducting body of revolution absorbs no angular momentum from an axisymmetric electromagnetic wave field—is in fact a special case of a more general result in electromagnetic scattering theory. In addition, the scaling of the efficiency of transfer of angular momentum to an object with the wavelength and object size merits f...

We have designed a sphere-graphene-slab structure so that the electromagnetic wave can be well confined in the graphene due to the formation of a bound state in a continuum (BIC) of radiation modes. Based on such a bound state, we have realized strong optical absorption in the monolayer graphene. Such a strong optical absorption exhibits many advantages. It is ultrasensitive to the wavelength b...

This course describes the interaction of electromagnetic radiation in the “optical” part of the spectrum (microwaves, infrared visible, ultraviolet) with matter—metals, insulators, semiconductors, and superconductors. Topics covered include the following. 1. Maxwell’s equations and plane waves in matter. 2. The refractive index N and the complex dielectric function, . 3. Semiclassical theories ...

Graphene nanostructures were synthesized by Hummer method. 1, 3, 5 and 7 wt% of graphene nanostructures were suspended in certain amount of acetone on a mechanical stirrer and stirred then added to epoxy resin. After 4 hours, solution and Graphene platelets (GPs) were prepared. Nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM ), Fourier transform i...