Transient analysis of localized circularly polarized light for all-optical magnetic recording

For ultra-high speed recording, all-optical magnetic recording technology with circularly polarized lights has been studied. However, it was difficult to localize circularly polarized light for realizing higher density magnetic recording because of the diffraction limit. Our proposed plasmonic cross antenna can generate the nano-sized circularly polarized light inside the recording media for high density magnetic recording. In this paper, we analyze the electromagnetic fields of a plasmonic cross antenna and the bit-patterned media by the ADE-FDTD method. The intensity of the electric fields inside the bit-patterned media and the speed to generate the circularly polarized light are discussed for all-optical magnetic recording.