1次元磁性フォトニック結晶の局在モードの磁気光学性能指数

概要

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Magneto-optical (MO) figure-of-merit parameters of localized modes in one-dimendional magnetophotonic crystals (1D-MPC) with bismuth-substituted yttrium iron garnet (Bi:YIG) film were studied numerically by using the matrix approach based on the 4×4 matrix formalism. The structure of 1D-MPC is expressed as (SiO_2/SiN)^k/Bi:YIG/(SiN_2/SiO)^k with the stacking number k, where the Bi:YIG interlayer acts as a defect supporting the magneto-optically active localized modes. The study revealed that the localized modes exhibit large figure-of-merit that the localized modes exhibit large figure-of merit parameters with very thin Bi:YIG layers; for instance, when k=10 and d_M(Bi:YIG thickness)=0.15μm, the first localized at mode at λ≈650nm exhibits T (transmissivity)≈50% and θ_F (Faraday rotation)= -6 deg., resulting in a figere-of-merit of Q_F=T^<1/2>∣θ_F∣≈4 deg. for the Faraday operation. while the localized mode shows R (reflectivity)≈8% and θ_k (Kerr rotation)=16 deg., yielding Q_k=R^<1/2>∣θ_k∣≈4.5 for the Kerr operation. These results strongly indicate that the 1D-MPC structure is very effective for realizing large figure-of merit parameters (comparable to those of Bi;YIG bulk materials) by using very thin Bi:YIG layers.
1999-07-01