Plasma-covered long cylindrical non-isotropic dielectric lenses for targeted control of energy distribution
- PDF / 3,262,149 Bytes
- 12 Pages / 439.37 x 666.142 pts Page_size
- 56 Downloads / 192 Views
Plasma-covered long cylindrical non-isotropic dielectric lenses for targeted control of energy distribution S. Golharani1,a
, E. Heidari-Semiromi2,b , B. Jazi1,c , Z. Rahmani1,d
1 Department of Laser and Photonics, University of Kashan, Kashan 0098, Iran 2 Department of Condense Matter, University of Kashan, Kashan 0098, Iran
Received: 23 July 2020 / Accepted: 18 September 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, a long column lens with a circular cross section made of two transversely non-isotropic dielectric parts covered by an isotropic plasma layer, is studied. The response of the mentioned object to the presence of plane monochromatic electromagnetic waves will be investigated. The finite element method has been used to calculate the field equations and the amplitudes of scattered waves in this research. This structure can be purposefully used as a device to focus electromagnetic wave energy in a specific area that its operation will be discussed by scattering theory. The electromagnetic responses of this structure have been simulated for two modes TE, TM of the incident wave, separately. Since in this lens a plasma region exists, the plasma can be considered as transparent or non-transparent states, with variations of plasma frequency in a fixed incident wave frequency. Here we consider the mentioned states too.
1 Introduction As we know, electromagnetic radiation can be caused by changes in the density of electric charges or atomic transitions. The radiation can be produced through the time variations in the density of free electric charges or time variations in the density of bound polarized charges. The existence of the time variations of the charge density fluctuations can be spontaneously or stimulated by external electromagnetic waves in a material. As we know, the interaction of an electromagnetic wave with an electromagnetic active structure will cause fluctuations in the density of free and bound electric charge carriers. This will also cause secondary radiation from the carrier oscillations of that material. This phenomenon is known as the scattering phenomenon in the science of the interaction of electromagnetic waves with an object [1– 5]. Certainly, the distribution of induced charge densities is a function of the shape of the inductive landing wave surface, the geometric shape, and the geometric dimensions of the target and its material. Consequently, the information obtained from the spatial distribution of the scattered waves by the object can be an important parameter for estimating the constituent structure of the object and the geometric dimensions of the target [6–8].
a e-mail: [email protected] (corresponding author) b e-mail: [email protected] c e-mail: [email protected] d e-mail: [email protected]
0123456789().: V,-vol
123
766
Page 2 of 12
Eur. Phys. J. Plus
(2020) 135:766
Generally, the scattering pattern of the electromagnetic waves is a diagnostic tool to find out the
Data Loading...
