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 |
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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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