Integrated optical isolator based on nonreciprocal-mode cut-off

Abstract

A concept of an integrated optical isolator is presented which uses the TM(0) mode propagating perpendicular to the in-plane magnetization of a planar magnetooptical waveguide. The cut-off thickness of the waveguide depends on the propagation direction. If the magnetic film has a strong Faraday rotation and is weakly guiding, the cut-off thicknesses for forward and backward propagation differ markedly. Operating close to cut-off yields a large difference between coupling efficiencies to the waveguide for forward and backward propagation.

Monolithic on-chip nonreciprocal photonics based on magneto-optical thin films

“…22 . Nonreciprocal mode conversion, cut-off, resonant delocalization, and coupling have also been theoretically explored [21][22][23][24][25][26][27] .…”

Metallic nonlinear magnetooptical nonreciprocal isolator

“…The magnetooptical isolators have gained a great deal of attention because they have the application basic element for the nonreciprocal devices realized in a planar form. The nonreciprocal behaviors appear only on the magnetic field components [1][2][3][4][5][6]. The metallic structure with negative permittivity ε f and positive permeability f is introduced by Pendry who used rays of metallic rods [7].…”

Metallic nonlinear magneto-optical nonreciprocal isolator

“…The magneto-optical isolators have gained a great deal of attention because they have the application basic element for the nonreciprocal devices realized in a planar form. The nonreciprocal behaviors appear only on the magnetic field components [1][2][3][4][5][6] . Nonlinear materials are studied intensively because of their potential applications in optical communications [7][8][9][10] .…”