Tunable nonreciprocal transmission based on non-Hermitian optical system with magnetic optical materials in a one-dimensional multilayer structure

Multiple nonreciprocal transmission based on defect modes of photonic crystals

“…Layers B with thickness dB and B′ with thickness dB′ are MO dielectric (bismuth iron garnet) applied on the static magnetic fields of equal size and opposite direction (where the static magnetic fields in left and right parts are along the positive and negative y-axis, respectively). The dielectric tensors of media layer B(B′) are functions of frequency f and the external static magnetic field because of the Voigt geometry; this is expressed as 14 , 18 εB(B′)=[εB0−inormalΔBfalse(B′false)0εB0inormalΔBfalse(B′false)0εB],where ΔB(B′…”

“…The value and sign of the off-diagonal component of the imaginary part can be tunable by the directions of magnetic fields, which violates reciprocity and time-reversal symmetries of the MO materials. 14 As an extension of PCs, MPCs exhibit remarkable MO properties accompanied by a large enhancement in their Kerr and Faraday rotations. 15 The Faraday effect is a nonreciprocal feature that breaks the time-reversal symmetry in MPCs.…”

“… – 13 Magneto-optic (MO) material is a steerable media that can be translated from isotropic medium to anisotropic medium with asymmetrical off-diagonal components of imaginary parts under a static magnetic field. The value and sign of the off-diagonal component of the imaginary part can be tunable by the directions of magnetic fields, which violates reciprocity and time-reversal symmetries of the MO materials 14 . As an extension of PCs, MPCs exhibit remarkable MO properties accompanied by a large enhancement in their Kerr and Faraday rotations 15 .…”