Formation of robust and completely tunable resonant photonic band gaps

TL;DR

This paper investigates various types of photonic band gaps in two-dimensional magnetic photonic crystals, highlighting their tunability via magnetic fields, robustness to disorder, and their relation to plasmonic flat bands.

Contribution

It introduces a classification of PBGs in magnetic photonic crystals, emphasizing their tunability, robustness, and connection to flat bands and plasmonics.

Findings

Magnetically tunable and disorder-robust PBGs identified.

Transmission calculations agree with band structure results.

Positional disorder affects different PBG types differently.

Abstract

We identify different types of the photonic band gaps (PBGs) of two dimensional magnetic photonic crystals (MPCs) consisting of arrays of magnetic cylinders and study the different tunability (by an external static magnetic field) of these PBGs. One type of the band gaps comes from infinitely degenerate flat bands and is closely related to those in the study of plasmonics. In addition, such PBGs are magnetically tunable and robust against position disorder. We calcualte the transmission of the PBG's and found excellent agreement with the results of the photonic band structure calculation. Positional disorder of the lattice structure affects the different types of PBGs differently.