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COUPLING EFFICIENCY OF METAMATERIAL MAGNETOOPTICAL INTEGRATED ISOLATOR

Electrical Engineering Department, Islamic University of Gaza, P.O. Box 108, Gaza, Palestinian Authority

Lehrstuhl für Messsystem-und Sensortechnik, Theresiensstr. 90, D-80333 München, Germany

Physics department, Al-Aqsa University, Gaza, Palestinian Authority, Institute of Physical Metallurgy and Metal Physics, Kopernikusstraβe 14, 52074 Aachen, Germany

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MOHAMMED M. SHABAT

Physics department, Islamic University of Gaza, P.O. Box 108, Gaza, Palestinian Authority

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https://doi.org/10.1142/S0217979209053655Cited by:5 (Source: Crossref)

Abstract

Nonreciprocal devices such as isolators are well-known in light wave communication systems. The integrated optical isolator is presented where the magnetic field modes propagate perpendicular to the in-plane magnetization of a planar magnetooptical waveguide. The cladding and film of optical isolator are made of magnetic materials with magnetization adjusted to be parallel to their plan. The substrate is filled with new artificial metamaterials (MTMs). The dispersion equation of the transverse magnetic (TM) fields is derived. The difference Δβ between the phase constant for forward and backward propagation is calculated numerically for different values of MTMs permittivity (ε_s) and permeability (μ_s). Results show that the cutoff thickness is different for forward and backward propagation and varies with the MTMs parameters. The cutoff thickness of the isolator is selected such that the coupling coefficients of the isolator with optical fiber are obviously different for forward and backward propagation.

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