A novel surface-integral-equation formulation for efficient and accurate electromagnetic analysis of near-zero-index structures

İBİLİ H., Koyaz Y., Ozmu U., Karaosmanoglu B., ERGÜL Ö. S.

JOURNAL OF OPTICS, vol.24, no.3, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 3
  • Publication Date: 2022
  • Doi Number: 10.1088/2040-8986/ac3e01
  • Journal Name: JOURNAL OF OPTICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: near-zero-index structures, homogenization, surface integral equations, boundary element methods, full-wave methods, DIELECTRIC OBJECTS, SCATTERING, DIAGONALIZATION, REALIZATION
  • Middle East Technical University Affiliated: Yes

Abstract

We consider accurate and iteratively efficient solutions of electromagnetic problems involving homogenized near-zero-index (NZI) bodies using surface-integral-equation formulations in the frequency domain. NZI structures can be practically useful in a plethora of optical applications, as they possess near-zero permittivity and/or permeability values that cannot be found in nature. Hence, numerical simulations are of the utmost importance for rigorous design and analysis of NZI structures. Unfortunately, small values of electromagnetic parameters bring computational challenges in numerical solutions of homogeneous models. Conventional formulations available in the literature encounter stability issues that make them inaccurate and/or inefficient as permittivity and/or permeability approach zero. We propose a novel formulation that involves a well-balanced combination of operators and that can provide both accurate and efficient solutions for all NZI cases. Numerical results are presented to demonstrate the superior properties of the developed formulation in comparison to the conventional ones.