title: Design of transverse electric ring isolators for ultra-low-loss Si3N4 waveguides based on the finite element method.
abstract: In this Letter we present the design of a novel (to our best knowledge) integrated TE isolator realized using ultra-low-loss Si(3)N(4) waveguides. The device is made of two straight waveguides coupled to an array of ring resonators including a Ce:YIG garnet grown on their internal side. The analysis demonstrates advantages in loss, isolation, and passband width as the number of rings is increased.
authors.affiliation: Scuola Superiore Sant’Anna, 56124, Pisa, Italy. paolo.pintus@sssup.it
authors.forename: Paolo
authors.initials: P
authors.lastname: Pintus
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Di Pasquale
authors.forename: John E
authors.initials: JE
authors.lastname: Bowers