Open AccessOn-chip waveguide isolator based on bismuth iron garnet operating via nonreciprocal single-mode cutoff
Author(s) -
Samuel M. Drezdzon,
Tomoyuki Yoshie
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.009276
Subject(s) - isolator , optical isolator , materials science , optics , finite difference time domain method , bismuth , permittivity , dielectric , waveguide , cutoff , optoelectronics , physics , optical fiber , electronic engineering , quantum mechanics , engineering , metallurgy
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.