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Flat-top response in one-dimensional magnetic photonic bandgap structures with Faraday rotation enhancement

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4 Author(s)
A. Levy ; Dept. of Mater. Sci. & Eng., Michigan Technol. Univ., Houghton, MI, USA ; H. C. Yang ; M. J. Steel ; J. Fujita

The transmission and Faraday rotation characteristics of one-dimensional photonic crystals in cerium-substituted yttrium iron garnet (Ce:YIG) with multiple defects in the optical bandgap are studied theoretically at λ = 1.55 μm. It is found that the interdefect spacing can be adjusted to yield a flat top response, with close to 100% transmission and 45° Faraday rotation, for film structures as thin as 30 to 35 μm. This is better than a three-fold reduction in thickness compared to the best Ce:YIG films for comparable rotations, and may allow a considerable reduction in size in manufactured optical isolators. Transmission bands as wide as 7 nm are predicted, which constitutes a considerable improvement over previously reported bandwidths for magnetic photonic crystals. Diffraction across the structure corresponds to a longer optical path length than the thickness of the film, calling for the use of guided optics to minimize insertion losses in integrated devices. The basis for the flat-top transmission in ferrite photonic crystals is presented and discussed

Published in:

Journal of Lightwave Technology  (Volume:19 ,  Issue: 12 )