Optimal design of NRD guide devices using 2D full-vectorial finite element method

LETTER

Tahir Bashir, Keita Morimoto, Akito Iguchi, Yasuhide Tsuji, Tatsuya Kashiwa, Shinji Nishiwaki

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Keywords: non-radiative dielectric waveguide (NRD guide), mosaic-like structure, direct binary search (DBS) algorithm, genetic algorithm (GA), finite element method (FEM), full-vectorial analysis

JOURNAL FREE ACCESS

2021 Volume 18 Issue 15 Pages 20210243

DOI https://doi.org/10.1587/elex.18.20210243

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Abstract

In this paper, we propose an optimal design approach based on a concept of mosaic-like structure for achieving high performance NRD devices. In order to improve design efficiency, we employ the recently proposed two-dimensional full vectorial finite element method (2D-FVFEM) which can accurately model 3D structure of NRD as a numerical simulation method. As an optimization method, we employ either direct binary search (DBS) algorithm or genetic algorithm (GA) depending on design problems. In order to show the usefulness of our approach, design examples of crossing and T-branch waveguides are considered and high transmission efficiency greater than 99.9% for crossing waveguide and 49.8%: 49.8% for T-branch waveguide is achieved. The numerical results by 2D-FVFEM are verified by 3D-FVFEM.

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