Reduced Bloch mode expansion for periodic media band structure calculations

TL;DR

This paper introduces a reduced Bloch mode expansion method for efficient and accurate calculation of band structures in periodic media, significantly decreasing computational effort while maintaining precision.

Contribution

The paper proposes a novel reduced basis approach using selected Bloch eigenfunctions at high symmetry points for faster band structure calculations in periodic media.

Findings

Achieves up to two orders of magnitude reduction in computation time.

Maintains high accuracy in phononic, photonic, and electronic band structure calculations.

Applicable to various types of periodic media with complex structures.

Abstract

Reduced Bloch mode expansion is presented for fast periodic media band structure calculations. The expansion employs a natural basis composed of a selected reduced set of Bloch eigenfunctions. The reduced basis is selected within the irreducible Brillouin zone at high symmetry points determined by the medium's crystal structure and group theory (and possibly at additional related points). At each of the reciprocal lattice selection points, a number of Bloch eigenfunctions are selected up to the frequency range of interest for the band structure calculations. Since it is common to initially discretize the periodic unit cell and solution field using some choice of basis, reduced Bloch mode expansion is practically a secondary expansion that uses a selected set of Bloch eigenvectors. Such expansion therefore keeps, and builds on, any favorable attributes a primary expansion approach might exhibit. Being in line with the well known concept of modal analysis, the proposed approach maintains accuracy while reducing the computation time by up to two orders of magnitudes or more depending on the size and extent of the calculations. Results are presented for phononic, photonic and electronic band structures.