Monolithically-Integrated TE-mode 1D Silicon-on-Insulator Isolators using Seedlayer-Free Garnet

Cui Zhang, Prabesh Dulal, Bethanie J.H. Stadler, David C. Hutchings

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The first experimental TE-mode silicon-on-insulator (SOI) isolators using Faraday Rotation are here realized to fill the 'missing link' in source-integrated near infrared photonic circuits. The isolators are simple 1D 2-element waveguides, where garnet claddings and longitudinal magnetic fields produce nonreciprocal mode conversion, the waveguide equivalent of Faraday Rotation (FR). Quasi-phase matched claddings are used to overcome the limitations of birefringence. Current experimental SOI isolators use nonreciprocal phase shift (NRPS) in interferometers or ring resonators, but to date NRPS requires TM-modes, so the TE-modes normally produced by integrated lasers cannot be isolated without many ancillary polarisation controls. The presented FR isolators are made via lithography and sputter deposition, which allows facile upscaling compared to the pulsed laser deposition or wafer bonding used in the fabrication of NRPS devices. Here, isolation ratios and losses of 11 dB and 4 dB were obtained, and future designs are identified capable of isolation ratios >30 dB with losses <6 dB.

Original languageEnglish (US)
Article number5820
JournalScientific reports
Issue number1
StatePublished - Dec 1 2017

Bibliographical note

Funding Information:
Tis research was sponsored as a World Materials Network by the Engineering and Physical Sciences Research Council (EP/J018708/1) and the National Science Foundation (DMR-1210818), and supported by the China Scholarship Council.

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