The effect of a metal layer with negative permittivity on the behavior of nonlinear-magnetoopic isolator is studied.
The isolator consists of Metal film, nonlinear cladding, and magnetooptic substrate. It is found that difference between
forward and backward propagation for TM0 mode increases with increasing the absolute value of the tuning parameter
which is the permittivity of the metal film, εf. It is also found that the maximum cutoff thickness of the isolator occurs
in selfdefocusing case around η=0.65 and at the highest assumed value of εf = -8. The results are interesting since they
assure the possibility to get maximum optimization of the isolator behavior by adding metallic materials.
Optical sensors have wide range of application such as in medicine, astronomy, industry, and others. Sensitivity of
symmetric three layered optical waveguide sensor is investigated. The proposed sensor consists of dielectric slab
surrounded by metamaterial (MTM) cladding and MTM substrate. MTMs are new artificial materials which have
simultaneously negative permittivity ε and negative permeability μ. Different values of MTMs parameters ε and μ are
chosen to optimize the sensitivity of the sensor. However, the value of εμ is kept content and equal to 4. The
dispersion equation which represents the effective index ne for transverse electric modes (TE) as a function of slab
thickness has been derived. A close form solution of the sensitivity (S) which is defined as the variation of the effective
index with respect to Temperature variation is introduced. The sensitivity then numerically calculated as function of the
film thickness at different values of Metamaterial parameters. It is found that sensitivity varies with the film thickness
and depends on the MTMs parameters. These results are important for designing sensors.
Stress effect on the behavior of optical waveguide sensor consists of dielectric slab inserted between metamaterial
(MTM) cladding and substrate is investigated by using numerical calculations. Several MTMs with different values of ε
and μ with ε μ = 4 are chosen in order to clarify the variation of stress effect with respect to the material constants.
Numerical calculations of the effective index for both transverse electric modes (TE) and transverse magnetic modes
(TM) as a function of stress and slab thickness have been performed. It is found that stress affects the performance of
the waveguide sensor.
Optical waveguide isolators are vital integrated optic modules in advanced optical fiber communication systems. This
study demonstrates an integrated optical isolator which has simple structure consisting of three layers. The thin magnetic
garnet film is sandwiched between linear dielectric cover and metamaterial (MTM) substrate. The effective refractive
indexes for both forward and backward fields are analytically calculated by deriving the dispersion equation of the TM
fields. The difference Δβ between the phase constant for forward and backward propagation is calculated numerically for
different values of MTMs permittivity (εs) and permeability (μs). In all the calculations, the value of εsμs is kept equal to
4. Δβ is also plotted as a function of the film thickness. Results show that the value of Δβ changes with the parameters of
MTMs and the film thickness. This helps in selecting the optimal design for the isolator at which Δβ approaches zero.
The results are encouraging to propose an optical isolator.
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