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Enhancement of Faraday rotation in defect modes of one-dimensional magnetophotonic crystals

Jalali Tahmineh, Gharaati Abdolrasoul, Rastegar Mohammad

Materials Science Poland

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2019

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Vol. 37, No. 3

446--453

EN

In this paper, employing of one-dimensional magnetophotonic crystals in infrared wavelengths range is considered. For this purpose, magnetophotonic multilayer structures, composed of magnetic defect layer surrounded by dielectric and MO Bragg mirrors, have been proposed. Ce:YIG with an optical thickness in the range of 0 to λs was used as a magnetic material. By using four by four transfer matrix method, the transmittance values and Faraday rotation (FR) angles of these structures were computed. The electric field distribution was obtained by Finite Element Method (FEM). By investigation of transmittance and FR angle of magnetophotonic crystals, it was possible to design the optimized structures with a rotation larger than 30 degrees and high transmittance. Such structures with a few micrometer thickness and fast magneto-optical (MO) responses have the potential to be used in MO devices like integrated photonic elements and sensors.

2

Surface plasmon resonance sensor with a magneto-optical structure

Pistora J., Lesnak M., Vlasin O., Cada M.

Optica Applicata

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2010

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Vol. 40, nr 4

883--895

EN

Due to resonant excitation of surface plasmons, surface plasmon resonance (SPR) sensors combined with ferromagnetic thin films allow an enhancement of the magneto-optical (MO) response. MO-SPR structures with Au/Co/Au sandwiches are theoretically analyzed in transverse configuration by 4×4 matrix algebra. The influence of sandwich film thickness, layer order and Co-Au multilayers on the relative change of the reflectance for p-polarized waves is analyzed. The results show the important role of the incidence angle distribution of the reflectance without magnetic ordering on the MO-SPR response. An optimized geometry and a corresponding feedback are discussed.

3

Nonlinear cut-off integrated optical isolator

Gniadek K.

Opto-Electronics Review

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2005

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Vol. 13, No. 2

147-150

EN

The paper presents a concept of an integrated isolator which operation combines the magnetooptic nonreciprocity and nonlinear effects. The isolator is based on nonreciprocal cut-off of TM modes in magnetooptical planar structure where one layer (e.g. top one) is nonlinear. The power dependence of the propagation constants in such configuration allows for easy control of the nonreciprocal behaviour of the counterpropagating TM modes and nonreciprocal cut-off thickness.

4

Field-induced structuring and light transmission in a gravitationally stratified ferrosuspension: an application in polymer film viscometry

Shulman Z. P., Kashevski S. B., Prokhorov I. V.

International Journal of Applied Mechanics and Engineering

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2004

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Vol. 9, no 4

771-779

EN

The dynamics of structuring and light transmission in response to a transverse magnetic field applied to a gravitationally stratified layer of a ferromagnetic suspension is studied numerically and experimentally. The results obtained have been used to substantiate and implement in practice a magnetooptical method of measuring the fluid viscosity in thin films. This method is employed to investigate the viscosity kinetics of a polymer solution in a drying film.

5

Magneto-optics in bi-gyrotropic garnet wavequide

Barta O., Pistora J., Vlcek J., Stanek F., Kreml T.

Opto-Electronics Review

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2001

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Vol. 9, No. 3

320-325

EN

In many works, the magneto-optical effects for optical frequencies are normally described by using an electric dipole approximation. Nevertheless, this approximation is problematic in far infrared region and for ultrathin filmsin the optical band. For this reason, dispersion relations have been derived for quided modes in a monolayer system at transverse geometry with bi-gyrotropic anisotropy on the base of matrix elements. The permeability tensor effect on wavequiding is analysed in detail. Experimental possibilities of the dark mode spectroscopy for permeability tensor study in mentioned structures are briefly discussed.