Table of Contents
ISRN Optics
Volume 2012, Article ID 865794, 5 pages
Research Article

Optimization of Magnetooptic Device by Low Switching Field Domains

Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA

Received 19 December 2011; Accepted 9 January 2012

Academic Editors: J. M. Girkin and I. S. Moreno

Copyright © 2012 Jin-Wei Tioh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper expounds on the optimization of magnetooptic devices using preferential domains that switch at low field strengths. In particular, an all-optical switch for transparent networks based on the Mach-Zehnder interferometer configuration is examined in detail. The switch utilizes bismuth-substituted iron garnets with a specific composition of (Bi1.1Tb1.9)(Fe4.25Ga0.75)O12 as Faraday rotators. It is proposed that switch figures of merit can be improved by preferentially choosing domains which align with applied fields at field strengths much lower than required by the bulk material. Measurement of magnetic domain orientation in the material and Faraday rotation within domains is reported. The domain behavior in low magnetic fields is also investigated to achieve a switch with lower switching times and higher extinction ratios.