Synthesis of Carbon Microparticles in Silicone Oil Using Focused Femtosecond Laser

The high peak intensity of femtosecond lasers can cause multiphoton absorption of material near its focal point. Thus, microfabrication inside the transparent solid material becomes possible. Transparent materials are not limited to solids, and it has been reported that micro/nanoparticles can be also synthesized near the focal point inside the transparent liquid material. In this paper, we investigated the synthesis of microparticles in a highly viscous transparent liquid using silicone oil. As a result, transparent carbon microparticles were synthesized when the wavelength of femtosecond laser was converted to 520 nm, and the microparticles might contain carbon nanocrystals due to graphitization.