Applications of magnetic garnet films in integrated optics

A novel type of optical waveguide isolator is proposed. It relies only on the TM/sub 0/ mode propagating in a strip waveguide which is divided by a compensation wall. The intensity distribution is different for forward and backward propagation. The backward mode can thus be eliminated by localized o...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1992-09, Vol.28 (5), p.2979-2984
Main Authors: Dotsch, H., Hertel, P., Luhrmann, B., Sure, S., Winkler, H.P., Ye, M.
Format: Article
Language:English
Subjects:
Absorption
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Ferrimagnetic materials
Garnet films
Integrated optics
Isolators
Optical and optoelectronic circuits
Optical films
Optical modulation
Optical propagation
Optical waveguides
Strips
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Summary:A novel type of optical waveguide isolator is proposed. It relies only on the TM/sub 0/ mode propagating in a strip waveguide which is divided by a compensation wall. The intensity distribution is different for forward and backward propagation. The backward mode can thus be eliminated by localized optical absorption. Detailed calculations exhibit the required geometry and material parameters. Furthermore, it is demonstrated that optical modulators can be realized using dynamical mode conversion introduced by ferrimagnetic, domain, and domain lattice resonances. Dynamical conversion efficiencies of 10% at frequencies up to 3 GHz are measured. The additional optical absorption caused by impurities incorporated into the garnet films during the epitaxial growth process can be reduced considerably by controlling the growth parameters, or by annealing treatments. Absorption constants of 0.2 cm/sup -1/ at 1.3 mu m wavelength have been achieved.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.179691