title: On-chip waveguide isolator based on bismuth iron garnet operating via nonreciprocal single-mode cutoff.
abstract: We analyze an on-chip optical isolator based on direction dependent single-mode cutoff, which is described in 1D and 2D momentum space. Isolation is shown using 3D finite difference time domain (FDTD) where the magnetization is represented by imaginary off-diagonal permittivity tensor elements. The isolator designs are optimized using perturbation theory, which successfully predicts increased isolation for rib waveguides and structures with non-magnetic dielectric layers. Our isolators are based on bismuth iron garnet and its compatible substrates; an isolation ratio of 10.7 dB/mm is achieved for TM modes.
authors.affiliation: Department of Electrical and Computer Engineering, Fitzpatrick Institute for Photonics, Duke University, Durham, NC, 27708-0291, USA. samuel.drezdzon@duke.edu
authors.forename: Samuel M
authors.initials: SM
authors.lastname: Drezdzon
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Yoshie
mesh_terms: D001729:Bismuth; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007501:Iron; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D018511:Systems Integration
chemical_list: D007501:Iron; D001729:Bismuth