Femtosecond laser writing

Femtosecond laser-writing methods have found extensive applications in the creation of three-dimensional (3D) photonic structures within transparent materials. Within our research group, we leverage a near-infrared femtosecond laser to conduct precise 3D nanoscale domain engineering in materials such as lithium niobate, lithium tantalate, and other ferroelectric crystals. The achieved resolution of 30 nm surpasses the conventional diffraction limit of light. Furthermore, we have pioneered a femtosecond laser-assisted nanolithography technique, enabling the realization of high-aspect-ratio nanofabrication specifically in lithium niobate crystals.