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

Abstract

We report a theoretical study of the enhanced Goos-Hänchen (GH) effect in a prism-waveguide coupling system with a magneto-optic thin film of Ce doped Y(3)Fe(5)O(12) (CeYIG). By magnetizing the CeYIG thin film along different directions, a variation of the GH shift can be observed, which is named as the MOGH (magneto-optical Goos-Hänchen) effect. The applied magnetic field direction is found to cause MOGH effect for light with different polarizations. As example systems, enhanced GH shift and MOGH effect is observed in both prism/Air/CeYIG/SiO(2) and prism/Au/CeYIG/SiO(2) structures, by applying opposite magnetic field across the CeYIG layer in a transverse magneto-optical Kerr effect (TMOKE) configuration. The GH and MOGH effect as a function of layer thicknesses, material refractive indices and magneto-optical properties are systematically simulated and discussed. It is observed that the coupling layer and MO layer thickness plays an important role of controlling the MOGH effect in the prism/Au/CeYIG/SiO(2) plasmonic waveguide structure. The MOGH effect shows high sensitivity to applied magnetic field and index variations, making it promising for applications such as optical switches, modulators, and chemical or biomedical index sensors.

Imbert–Fedorov Effects of Polarized Laser Beams Reflected from Dove Prism/Indium Tin Oxide Interface under Electric and Thermal Fields

“…Goos-Hänchen (GH) and Imbert-Fedorov (IF) effects are effective beam shifts that deviate from the theoretical optical geometry in the parallel and vertical directions of the incident light; they are realized when light is incident upon a surface or interface. GH and IF effects have been researched for more than 60 years; [1,2] they have been observed in various structures and material systems, including glass-indium tin oxide (ITO)surrounding media, [3] prism/air/CeYIG/SiO 2 media, [4] electrooptic/magneto-electric heterostructures, [5,6] metasurfaces, [7][8][9][10][11] metals, [12] metal-insulator-semiconductor, [13] graphene-coated surfaces, [14] garnet, [15] SiO 2 /Si, [16] and dielectric slabs. [17] Researchers have considered not only the physical principles but also the applications of GH and IF effects, including sensing [18] and switching.…”

Optical beam shift induced by direct current

“…These phenomena occur in optical waves, matter waves, and acoustic waves and have many applications, such as sensing, imaging, and detection . These optical beam shifts attribute to external thermal force , external magnetic field , external electric, and magnetic field .…”

Magnetic control of Goos-Hänchen shifts in a yttrium-iron-garnet film

“…As a result, a lateral shift for reflection will occur at the interface between the vacuum and an magnetic material arranged in the Voigt geometry even at normal incidence 14 15 , with both sign and magnitude controlled by the applied magnetic field. And the polarization-dependence of the GH shift by MO materials makes it possible to separate the incident radiation into beams of different polarizations 21 . However, the details of the magnetic effects on GH shift are stilled obscure.…”