Optimized Magneto-optical Isolator Designs Inspired by Seedlayer-Free Terbium Iron Garnets with Opposite Chirality

Prabesh Dulal; Andrew D. Block; Thomas E. Gage; Harold A. Haldren; Sang Yeob Sung; David C. Hutchings; Bethanie J H Stadler

doi:10.1021/acsphotonics.6b00313

Optimized Magneto-optical Isolator Designs Inspired by Seedlayer-Free Terbium Iron Garnets with Opposite Chirality

Prabesh Dulal, Andrew D. Block, Thomas E. Gage, Harold A. Haldren, Sang Yeob Sung, David C. Hutchings, Bethanie J H Stadler

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Simulations demonstrate that undoped yttrium iron garnet (YIG) seedlayers cause reduced Faraday rotation in silicon-on-insulator 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 1550 nm were measured to be +500°/cm 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 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.

Original language	English (US)
Pages (from-to)	1818-1825
Number of pages	8
Journal	ACS Photonics
Volume	3
Issue number	10
DOIs	https://doi.org/10.1021/acsphotonics.6b00313
State	Published - Oct 19 2016

Bibliographical note

Funding Information:
This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-1420013 and was supported partially by National Science Foundation via the World Materials Network: DMR-1210818. Parts of this work were carried out in the UMN Characterization Facility. The authors would like to thank the Minnesota Nanofabrication Center (MNC) staff for their valuable support and are grateful for resources from the Minnesota Supercomputing Institute (MSI).

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

cerium-doped yttrium iron garnet (Ce:YIG)
Faraday rotation
optical isolator
silicon on insulator (SOI) waveguides
terbium iron garnet (TIG)
yttrium iron garnet (YIG) seedlayer

How much support was provided by MRSEC?

Partial

Reporting period for MRSEC

Period 3

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10.1021/acsphotonics.6b00313

http://eprints.gla.ac.uk/124482/7/124482.pdf

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@article{a0afcb6d2d6240babe6d368354ee0e9b,

title = "Optimized Magneto-optical Isolator Designs Inspired by Seedlayer-Free Terbium Iron Garnets with Opposite Chirality",

abstract = "Simulations demonstrate that undoped yttrium iron garnet (YIG) seedlayers cause reduced Faraday rotation in silicon-on-insulator 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 1550 nm were measured to be +500°/cm 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 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.",

keywords = "cerium-doped yttrium iron garnet (Ce:YIG), Faraday rotation, optical isolator, silicon on insulator (SOI) waveguides, terbium iron garnet (TIG), yttrium iron garnet (YIG) seedlayer",

author = "Prabesh Dulal and Block, {Andrew D.} and Gage, {Thomas E.} and Haldren, {Harold A.} and Sung, {Sang Yeob} and Hutchings, {David C.} and Stadler, {Bethanie J H}",

note = "Funding Information: This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-1420013 and was supported partially by National Science Foundation via the World Materials Network: DMR-1210818. Parts of this work were carried out in the UMN Characterization Facility. The authors would like to thank the Minnesota Nanofabrication Center (MNC) staff for their valuable support and are grateful for resources from the Minnesota Supercomputing Institute (MSI). Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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doi = "10.1021/acsphotonics.6b00313",

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AU - Haldren, Harold A.

AU - Sung, Sang Yeob

AU - Hutchings, David C.

AU - Stadler, Bethanie J H

N1 - Funding Information: This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-1420013 and was supported partially by National Science Foundation via the World Materials Network: DMR-1210818. Parts of this work were carried out in the UMN Characterization Facility. The authors would like to thank the Minnesota Nanofabrication Center (MNC) staff for their valuable support and are grateful for resources from the Minnesota Supercomputing Institute (MSI). Publisher Copyright: © 2016 American Chemical Society.

PY - 2016/10/19

Y1 - 2016/10/19

N2 - Simulations demonstrate that undoped yttrium iron garnet (YIG) seedlayers cause reduced Faraday rotation in silicon-on-insulator 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 1550 nm were measured to be +500°/cm 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 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.

AB - Simulations demonstrate that undoped yttrium iron garnet (YIG) seedlayers cause reduced Faraday rotation in silicon-on-insulator 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 1550 nm were measured to be +500°/cm 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 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.

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KW - optical isolator

KW - silicon on insulator (SOI) waveguides

KW - terbium iron garnet (TIG)

KW - yttrium iron garnet (YIG) seedlayer

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Optimized Magneto-optical Isolator Designs Inspired by Seedlayer-Free Terbium Iron Garnets with Opposite Chirality

Abstract

Bibliographical note

Keywords

How much support was provided by MRSEC?

Reporting period for MRSEC

Access

OpenUrl availability

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MRSEC SEED Projects

University of Minnesota MRSEC (DMR-1420013)

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