Enhancement of Goos-Haenchen effect in a prism-waveguide coupling system with magneto-optic material

摘要

We report a theoretical study of the enhancement of Goos-Haenchen (GH) effect in a prism-waveguide coupling system with magneto-optic materials, including dielectric waveguide (Prism/Air/Ce:YIG/SiO_2) and plasmonic waveguide (Prism/Au/Ce:YIG/SiO_2) structures. Giant GH shift is observed in both waveguides. By applying opposite magnetic field across the CeYIG layer, a variation of the GH shift, namely MOGH (magneto-optical Goos-Haenchen effect) is observed. Compared to the reflectivity and Goos-Haenchen effects of the structures, the MOGH effect shows higher sensitivity for index variations, therefore is very promising for chemical or biomedical index sensors. The device performance as a function of layer dimension, material refractive index and magneto-optical properties are simulated and discussed in detail. It is observed that coupling layer, MO layer thickness and prism index plays an important role in the plasmonic waveguide to control MOGH effect.