Title :
Flat-top response in one-dimensional magnetic photonic bandgap structures with Faraday rotation enhancement
Author :
Levy, M. ; Yang, H.C. ; Steel, M.J. ; Fujita, J.
Author_Institution :
Dept. of Mater. Sci. & Eng., Michigan Technol. Univ., Houghton, MI, USA
fDate :
12/1/2001 12:00:00 AM
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 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
Keywords :
Faraday effect; cerium; garnets; magnetic thin films; magneto-optical isolators; optical communication equipment; optical films; optical losses; photonic band gap; yttrium compounds; 1.55 micron; 1D magnetic photonic bandgap structures; 30 to 35 micron; Ce:YIG; Faraday rotation; Faraday rotation characteristics; Faraday rotation enhancement; YFe5O12:Ce; YIG:Ce; cerium-substituted yttrium iron garnet; ferrite photonic crystals; film structures; flat top response; flat-top response; flat-top transmission; guided optics; insertion losses; integrated devices; interdefect spacing; magnetic films; magnetic photonic crystals; magnetooptic devices; magnetooptic films; multichannel thin-film optical isolators; multiple defects; one-dimensional magnetic photonic bandgap structures; optical bandgap; optical isolators; optical path length; transmission bands; Garnets; Integrated optics; Iron; Magnetic films; Manufacturing; Optical devices; Optical films; Photonic band gap; Photonic crystals; Yttrium;
Journal_Title :
Lightwave Technology, Journal of
