TM-mode coupling in magneto-optic waveguide caused by periodic perturbation

Kazimierz Gniadek

doi:10.1117/12.417833

7 March 2001 TM-mode coupling in magneto-optic waveguide caused by periodic perturbation

Kazimierz Gniadek

Proceedings Volume 4356, 12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; (2001) https://doi.org/10.1117/12.417833
Event: 12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2000, Velke Losiny, Czech Republic

Abstract

TM-modes coupling in an magneto-optic waveguide caused by periodic perturbation of the interface have been analyzed. Introducing into waveguide structure a gryotropic material gives an additional 'degree of freedom' namely external magnetic field. Using the coupled-mode theory the problem of mod interaction is reduced to a pair of coupled equations. Coupling between the modes propagating in the opposite direction is analyzed. When the approximate phase matching condition is satisfied, the incident TM mode power decreases exponentially along the perturbation region. This evanescence behavior is the result of the distributed 'reflection' of incident power into the backward traveling TM mode. The evanescence behavior occurs for a range of frequencies called 'forbidden' zone in which the propagation constant has an imaginary part. In magneto-optic waveguide the center frequency of the gap can be easily controlled by external magnetic field.

Citation Download Citation

Kazimierz Gniadek "TM-mode coupling in magneto-optic waveguide caused by periodic perturbation", Proc. SPIE 4356, 12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, (7 March 2001); https://doi.org/10.1117/12.417833

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KEYWORDS

Waveguides

Wave propagation

Magnetism

Dielectrics

Magneto-optics

Radio propagation

Interfaces

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