Effects of Extrinsic Magnetized GaAs in One-Dimensional Ternary Photonic Crystals

This work focuses on the magneto-optical behavior of one-dimensional ternary photonic crystals that incorporate extrinsically magnetized <i>GaAs</i> as a functional layer. In this context, we investigate the effect of an applied transverse magnetic field on the optical response and photonic band gap characteristics of the proposed structure. The transfer matrix method is utilized to analyze the optical response of the ternary structure. The ternary photonic crystal with extrinsically magnetized <i>GaAs</i> exhibits strong magnetic tunability. The photonic band gap shifts from 0.32 THz to 0.38 THz under an applied external magnetic field up to 0.75 T with 100% band gap modulation. The polarization mode also shifts within the range of 0.32-0.36/0.38 THz due to the anisotropic response of the magnetized <i>GaAs</i>. These results confirm the effectiveness of extrinsic magnetization for compact, dynamically tunable photonic devices. The proposed configuration thus provides an effective framework for developing multichannel and broadband transmission filters that can be adjusted in the terahertz domain.