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 journalArticle

22 Scopus citations


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 languageEnglish (US)
Pages (from-to)1818-1825
Number of pages8
JournalACS Photonics
Issue number10
StatePublished - Oct 19 2016


  • 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

Fingerprint Dive into the research topics of 'Optimized Magneto-optical Isolator Designs Inspired by Seedlayer-Free Terbium Iron Garnets with Opposite Chirality'. Together they form a unique fingerprint.

  • Projects

    MRSEC SEED Projects

    11/1/14 → …

    Project: Research project

    University of Minnesota MRSEC (DMR-1420013)

    Lodge, T. P.


    Project: Research project

    Cite this