Faraday effect enhancement in Co–ferrite layer incorporated into one-dimensional photonic crystal working as a Fabry–Pérot resonator

Abstract

We fabricated a one-dimensional magnetophotonic crystal (MPC), in which a magnetic layer of Co–ferrite (∼40 nm in thickness) is sandwiched by a couple of dielectric multilayer reflectors with (SiO2/TiO2)×7 structure. The Co–ferrite layer was synthesized by ferrite plating from aqueous solution at 90 °C. The MPC is so designed to enhance magneto-optical Faraday rotation θF at the Fabry–Pérot resonance wavelength λ of the multilayer structure. θF was observed to increase by factor of ∼5.4, but at λ=∼620 nm which is deviated from the target resonance (λ=740 nm) and at very weak transmissivity. This may be because the Co–ferrite layer is rough in surface and smaller in thickness than the target thickness at which Fabry–Pérot resonance is designed to occur.

Far infrared Faraday rotation effect in one-dimensional microcavity type magnetic photonic crystals

“…Microcavity type MPCs present a comparable Faraday rotation effect to the previous structures [11]. Those structures were quickly prepared and addressed by both the experiments and further calculations [12][13][14][15][16], and excellent agreement between the experiments and calculations was achieved in Ref. [17].…”

Enhancement of Faraday effect in one-dimensional magneto-optical photonic crystal including a magnetic layer with wavelength dependent off-diagonal elements of dielectric constant tensor

“…When some defects are included in the periodic structure, the light is localized in the vicinity of them due to the multiple interference of light. When a magnetically active defect is introduced into the one-dimensional PC, which is called one-dimensional magnetooptical photonic crystal (1-D MPC), the simultaneous appearance of enhanced magneto-optical effects and light localization has been demonstrated [1][2][3][4][5][6][7][8][9][10].…”

Magneto-optics enhancement with gain-assisted plasmonic subdiffraction chains

“…Non-diagonal terms in the permittivity tensor (1 (5) where is an unknown tensor which relates the applied electric field E and the induced dipole moment of the sphere d . The electric field in the surrounding medium is given by …”

“…One of these incorporates layered systems [3][4][5][6][7][8][9] for which a rigorous eigenmodes analysis can be performed. In these structures, at a certain frequency, multiple refraction of light from interfaces between magnetic and non-magnetic layers may result in the Fabry-Perot resonance and an enhancement of the Faraday rotation.…”