Reflection performance of the Au/Cr asymmetrical grating under electric and magnetic fields

Abstract

Symmetric grating is difficult to meet the requirements of optical communication, optical sensing, and solar cells, as the strictly integrating performance of the transmission or reflection efficiency, polarization, incident angle, and bandwidth. The asymmetrical grating is introduced to improve the performance of the optical devices. Here, the polarization properties, and spatial displacement of the P- and S- laser beams reflected from the Au/Cr asymmetrical grating under electric and magnetic fields are studied. The Goos-Hänchen (GH) shifts of the P-laser beam show dumbbell distribution. The GH shifts of the S-laser beam can be affected by the external direct current and magnetic field. The maximum GH and Imbert-Fedorov (IF) shifts of the P-laser beam are 15.75 µm and 35.10 µm, respectively. The maximum GH and IF shifts of the S-laser beam are 88.40 µm and 121.00 µm, respectively. The Au/Cr asymmetrical grating can be applied in polarization optics, magnetic sensors, electric sensors, and light manipulation.