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Magneto-optical properties of waveguide structures containing magnetic nanoparticles using femtosecond laser

This paper demonstrates the advantages of a femtosecond-laser-processing method as a novel fabrication technique of waveguides containing such nanocomposites inside glass materials. By focusing the femtosecond laser inside the transparent glass, the nanocomposites are space-selectively precipitated as results of atomic diffusion and crystallization processes. At the same time, the refractive index of the irradiated area becomes higher, leading to the formation of optical waveguides. Due to the advantages, this method can be potentially applied to produce magneto-optical micro-devices, such as three-dimensional high density magnetic recording devices or micro-sized optical isolators integrated with waveguides. Recently, optical interfaces between electronic circuits are actively studied. In such advanced high-speed devices, micro lasers and the appropriate micro isolators are required.