We present an efficient technique to use the periodic method of moments (PMOM) in analyzing the plasmonic nano-antenna gratings (PNAGs) on natural/artificial anisotropic thin films. The artificial media are made up of two alternating isotropic regions in which the optic axis is chosen to be parallel to the period of grating due to its more complicated analysis. Dyadic Green's function (DGF) of these structures is obtained by utilizing the equivalent model of transmission line in Fourier domain and considering the plasmonic effects. Such a DGF is used in a series equation formulated for computing the effective electric currents induced on PNAG's surface. Solving such a series equation is carried out using Galerkin's version of PMOM with appropriate sub-domain functions. Using this technique, the scattering characteristics of different examples of double-screen PNAGs with homogeneous natural/inhomogeneous artificial anisotropic thin films are calculated. Assessment of this technique's efficiency is carried out by taking its cost–time and convergence rate vs truncation orders into account. It is shown that by using the developed technique, not only PNAGs with natural/artificial dielectrics can be analyzed within short time but also CPU and memory occupancies are reduced in comparison with commercial Electromagnetic (EM)-solvers.
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14 June 2021
Research Article|
June 10 2021
Dyadic Green's function of plasmonic nano-antenna gratings on natural/artificial anisotropic thin films
Special Collection:
Plasmonics: Enabling Functionalities with Novel Materials
Mahmood Rafaei-Booket
;
Mahmood Rafaei-Booket
a)
Faculty of Electrical and Computer Engineering, University of Zanjan
, Zanjan 45371-38791, Iran
a)Author to whom correspondence should be addressed: Booket@znu.ac.ir
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Mahdieh Bozorgi
Mahdieh Bozorgi
Faculty of Electrical and Computer Engineering, University of Zanjan
, Zanjan 45371-38791, Iran
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a)Author to whom correspondence should be addressed: Booket@znu.ac.ir
Note: This paper is part of the Special Topic on Plasmonics: Enabling Functionalities with Novel Materials.
J. Appl. Phys. 129, 223105 (2021)
Article history
Received:
December 03 2020
Accepted:
May 22 2021
Citation
Mahmood Rafaei-Booket, Mahdieh Bozorgi; Dyadic Green's function of plasmonic nano-antenna gratings on natural/artificial anisotropic thin films. J. Appl. Phys. 14 June 2021; 129 (22): 223105. https://doi.org/10.1063/5.0039500
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