Abstract

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 = 1.55 m. 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 m. 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.

[IEEE ]

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References

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  1. M. J. Steel, M. Levy and R. M. Osgood Jr., "Large magneto-optical Kerr rotation with high reflectivity from photonic band gap structures with defects", J. Lightwave Technol., vol. 18, pp. 1289-1296, Sept. 2000 .
  2. W. Li and J. W. Y. Lit, "Phase-shifted Bragg grating filters with symmetrical structures", J. Lightwave Technol., vol. 15, pp. 1405-1409, Aug. 1997 .

J. Lightwave Technol. (2)

M. J. Steel, M. Levy and R. M. Osgood Jr., "Large magneto-optical Kerr rotation with high reflectivity from photonic band gap structures with defects", J. Lightwave Technol., vol. 18, pp. 1289-1296, Sept. 2000 .

W. Li and J. W. Y. Lit, "Phase-shifted Bragg grating filters with symmetrical structures", J. Lightwave Technol., vol. 15, pp. 1405-1409, Aug. 1997 .

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