| Original Articles |
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Magneto-Optic Coupling Theory for Guided Optical Waves and Magnetostatic Waves Using an Arbitrarily Tilted Bias Magnetic Field |
| WU Bao-Jian;QIU Kun |
| School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 610054 |
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| Cite this article: |
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WU Bao-Jian, QIU Kun 2005 Chin. Phys. Lett. 22 2396-2399 |
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Abstract We report the magneto-optic (MO) coupling interaction of guided optical waves (GOWs) with magnetostatic waves (MSWs) in MO film waveguides using arbitrarily tilted bias magnetic fields. The universal MO coupled-mode equations are obtained and can be applied to the collinear or noncollinear interactions of the GOWs with magnetostatic forward volume wave (MSFVW), magnetostatic backward volume wave (MSBVW) and magnetostatic surface wave (MSSW). As a typical example, the noncollinear diffraction interaction of the GOW with the MSFVW excited by single-element microstrip line transducer in the yttrium-iron-garnet (YIG) film is analysed in detail. For the case of normal magnetization, the calculated plot is consistent with the experimental results in the first passband. By comparison, the diffraction efficiency (DE) can further be improved by optimizing the magnetization direction. The maximum DE gain can reach 5.7dB under the appropriately inclined bias magnetic field at ψ=180° and θ=9°.
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| Keywords:
78.20.Ls
75.30.Ds
85.70.Sq
78.90.+t
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Published: 01 September 2005
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| PACS: |
78.20.Ls
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(Magneto-optical effects)
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75.30.Ds
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(Spin waves)
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85.70.Sq
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(Magnetooptical devices)
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78.90.+t
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(Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter)
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