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Proceedings Paper

TM-mode coupling in magneto-optic waveguide caused by periodic perturbation
Author(s): Kazimierz Gniadek
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Paper 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.

Paper Details

Date Published: 7 March 2001
PDF: 7 pages
Proc. SPIE 4356, 12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, (7 March 2001); doi: 10.1117/12.417833
Show Author Affiliations
Kazimierz Gniadek, Warsaw Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 4356:
12th Czech-Slovak-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Jan Perina; Miroslav Hrabovsky; Jaromir Krepelka, Editor(s)

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