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1

Analytical sensitivity and reflected power through a D-shape optical fibre sensor

Ubeid M. F., Shabat M. M.

Opto-Electronics Review

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2014

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Vol. 22, No. 3

191-195

EN

In this paper, the reflection properties and sensitivity of a D-shape optical fibre sensor are investigated theoretically and numerically with the emphasis on the metal layer [gold (Au), silver (Ag), copper (Cu), and aluminum (Al)]. Maxwell’s equations are used to determine the electric and magnetic fields of the incident waves at each layer. Snell's law is applied and the boundary conditions are imposed at each layer interface to calculate the reflected power and sensitivity of the sensor. In the numerical results, the mentioned power is computed and illustrated as a function of wavelength, angle of incidence, metal layer thickness and refractive index of the external medium when the metal layer changes. The variation of sensitivity with the wavelength of the incident radiations is also proposed for some of the given metals.

2

Reflected and transmitted powers of electromagnetic waves through a ferrite-dielectric photonic crystal

Ubeid M. F., Shabat M. M.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 14, iss. 1

86--98

EN

In this work, reflection and transmission of electromagnetic wave by a periodic ferrite-dielectric photonic crystal are investigated theoretically and numerically. The ferrite material is described and its main parameters are given in detail. After the construction of the problem, the reflection and transmission coefficients are derived in a closed form by a transfer matrix method. The reflected, transmitted, and loss powers of the crystal are calculated using these coefficients. In the numerical results the mentioned powers are computed and illustrated as a function of frequency, angle of incidence, dielectric thickness, and applied magnetic field intensity when the damping coefficient changes.

3

Effect of dissipation factor on reflected and transmitted powers of a structure containing left-handed material waveguide

Ubeid M.F., Shabat M.M., Sid-Ahmed M.O.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 3

1-11

EN

In this paper a waveguide structure consisting of a pair of left-handed material (LHM) and dielectric slabs inserted in vacuum is investigated theoretically. Two cases of the LHM are considered, loss-less case and loss case as well as the frequency dependence of permittivity and permeability of it is taken into account. Maxwell's equations are used to determine the electric and magnetic fields of the incident waves at each layer. Snell's law is applied and the boundary conditions are imposed at each layer interface to calculate the reflected, transmitted and loss powers of the structure. Numerical results are illustrated to show the effect of frequency, angle of incidence and LHM thickness on the mentioned powers when the dissipation factor changes. The obtained results are in agreement with the law of conservation of energy.

4

Theoretical study of slab waveguide optical sensor with left-handed material as a core layer

Taya S. A., El-Agez T. M., Kullab H. M., Abadla M. M., Shabat M. M.

Optica Applicata

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2012

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Vol. 42, nr 1

193-205

EN

A three-layer planar waveguide sensor consisting of thin left-handed material core layer is investigated for sensing applications. The sensitivity of the proposed sensor to the changes in the refractive index of the cladding is presented and studied for TE-polarized light. It is observed that the sensitivity of the proposed sensor is improved compared to that of the conventional three-layer slab waveguide sensor. It is also found that the sensitivity of the structure proposed is negative and critically dependent on the dispersive permittivity and permeability of the core layer.

5

Lossy double negative guiding layer optical sensors

El-Khozondar H. J., Taya S. A., Shabat M. M., Mehjez E. M.

Opto-Electronics Review

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2011

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Vol. 19, No. 3

277-281

EN

We proposed a three-layer waveguide as an optical sensor for homogeneous sensing applications. A guiding layer of the proposed structure is considered as lossy left-handed material (LHM) with simultaneously the complex negative electric permittivity µ and the complex negative magnetic permeability µ. We also assume a cladding layer to have an intensity-dependent refractive index. Sensitivity of the proposed optical waveguide sensor is derived and its dependence on different parameters of a waveguide is studied.