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Local excitation of a perfectly conducting slab with finite or infinite number of slits and the role of proper complex waves

Sheikh Ansari, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1109/TAP.2020.2983766
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2020
  4. Abstract:
  5. The physics and modes of radiation in structures exhibiting extraordinary transmission (ET) can be best studied using Green's function formalism. In this article, we find the electromagnetic response to local excitation of a canonical structure exhibiting ET, and investigate the role of complex waves. The structure is a perfectly conducting slab having a finite or infinite number of through-slits. The solution breaks up the field into even and odd modes, and solves for the fields of the structure with a finite number of slits, by setting up an integral equation. The solution is then extended to find Greens' function of the infinitely periodic structure. The dispersion relations of the complex modes are found, and existence of proper complex modes is shown around ET frequencies. It is shown that these proper complex modes play an important role in determining the far-field and emergence of ET. © 1963-2012 IEEE
  6. Keywords:
  7. Complex modes ; Extraordinary transmission (ET) ; Gratings ; Green's function ; Electric excitation ; Canonical structure ; Complex waves ; Dispersion relations ; Electromagnetic response ; Even- and odd-mode ; Extraordinary transmission ; Finite number ; Infinite numbers ; Integral equations
  8. Source: IEEE Transactions on Antennas and Propagation ; Volume 68, Issue 8 , 2020 , Pages 6154-6161
  9. URL: https://ieeexplore.ieee.org/document/9055412