Magneto-optical Goos-Hänchen effect in a prism-waveguide coupling structure.

Area of Science:

• Photonics and Optics
• Materials Science
• Magneto-optics

Background:

• The Goos-Hänchen (GH) effect describes the transverse spatial shift of a reflected light beam.
• Magneto-optic materials offer tunable optical properties under magnetic fields.
• Prism-waveguide coupling systems are utilized for enhanced light-matter interactions.

Purpose of the Study:

• To theoretically investigate the enhanced Goos-Hänchen (GH) effect in a prism-waveguide system incorporating a magneto-optic (MO) thin film.
• To explore the magneto-optical Goos-Hänchen (MOGH) effect, a variation of the GH shift influenced by magnetic field direction in Ce-doped Y(3)Fe(5)O(12) (CeYIG) films.
• To analyze the MOGH effect's dependence on various parameters and its potential applications.

Main Methods:

• Theoretical modeling of light propagation in a prism-waveguide coupling system.
• Simulation of the GH and MOGH shifts in structures like prism/Air/CeYIG/SiO(2) and prism/Au/CeYIG/SiO(2).
• Systematic analysis of the effects of layer thicknesses, refractive indices, and magneto-optical properties.

Main Results:

• An enhanced GH shift and a significant MOGH effect were observed in the studied structures.
• The direction of the applied magnetic field was found to influence the MOGH effect for different light polarizations.
• The thickness of the coupling and MO layers critically controls the MOGH effect in plasmonic waveguide structures.
• The MOGH effect demonstrated high sensitivity to applied magnetic fields and refractive index variations.

Conclusions:

• The MOGH effect in CeYIG-based prism-waveguide systems is tunable via magnetic field direction and material properties.
• The observed sensitivity suggests potential applications for MOGH effect in optical switches, modulators, and sensors.
• This study provides a theoretical foundation for designing advanced magneto-optic devices.