Optimized magneto-optical isolator designs inspired by seedlayer-free terbium iron garnets with opposite chirality

Dulal, P., Block, A. D., Gage, T. E., Haldren, H. A., Sung, S. Y., Hutchings, D. C. and Stadler, B. J.H. (2016) Optimized magneto-optical isolator designs inspired by seedlayer-free terbium iron garnets with opposite chirality. ACS Photonics, 3(10), pp. 1818-1825. (doi:10.1021/acsphotonics.6b00313)

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Abstract

Simulations demonstrate that undoped yttrium iron garnet (YIG) seedlayers cause reduced Faraday rotation in silicon-on-insulator (SOI) waveguides with Ce-doped YIG claddings. Undoped seedlayers are required for the crystallization of the magneto-optical Ce:YIG claddings, but they diminish the interaction of the Ce:YIG with the guided modes. Therefore new magneto-optical garnets, terbium iron garnet (TIG) and bismuth-doped TIG (Bi:TIG), are introduced that can be integrated directly on Si and quartz substrates without seedlayers. The Faraday rotations of TIG and Bi:TIG films at 1550nm were measured to be +500 and -500°/cm, respectively. Simulations show that these new garnets have the potential to significantly mitigate the negative impact of the seedlayers under Ce:YIG claddings. The successful growth of TIG and Bi:TIG on low-index fused quartz inspired novel garnet-core waveguide isolator designs, simulated using finite difference time domain (FDTD) methods. These designs use alternating segments of positive and negative Faraday rotation for push-pull quasi phase matching in order to overcome birefringence in waveguides with rectangular cross-sections.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hutchings, Professor David
Authors: Dulal, P., Block, A. D., Gage, T. E., Haldren, H. A., Sung, S. Y., Hutchings, D. C., and Stadler, B. J.H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:ACS Photonics
Publisher:American Chemical Society
ISSN:2330-4022
ISSN (Online):2330-4022
Published Online:09 September 2016
Copyright Holders:Copyright © 2016 American Chemical Society
First Published:First published in ACS Photonics 3(10); 1818-1825
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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