3 results about "Laser direct writing" patented technology

Provided is a method for preparing a two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing. The invention provides a method and experiment device for preparing the periodically-distributed two-dimensional photonic crystal structure with the feature size being the sub-micron dimension in one step in the large area by focusing identical-wavelength double-pulse femtosecond laser on the surface of metal through a plano-convex cylindrical lens, and the identical-wavelength double-pulse femtosecond laser is obtained based on the spectrophotometry of birefringent crystals and has the features of collinear transmission, cross polarization and picosecond time delay. Two-dimensional periodic structure patterns can be effectively regulated and controlled by changing the energy and the number of pulses of input laser, the thicknesses and the azimuth angles of the birefringent crystals and the like. Through the combined design of different linear polarization directions and the variable time delay feature of two femtosecond laser pulses and focusing of the cylindrical lens, preparation of the two-dimensional metallic photonic crystal structure within the large area is achieved conveniently and quickly. The novel preparation method adopting the double-pulse femtosecond laser with cross polarization and variable time delay has potential important applications in the field of material micro-nano processing and preparation.

The invention belongs to the technical field of laser application, and particularly relates to a metal oxide micro-nano structure based on femtosecond laser direct writing as well as preparation and application of the metal oxide micro-nano structure. The preparation method comprises the following steps of: firstly, mixing a metal oxide precursor with a solvent to prepare metal oxide precursor sol-gel, then coating the surface of a substrate with the sol-gel obtain a gel film, and carrying out femtosecond laser direct writing; and enabling the metal oxide precursor to react to generate a metaloxide micro-nano structure by utilizing energy generated by high peak power of femtosecond laser. According to the method, the preparation of the metal oxide micro-nano structure is directly realizedthrough a femtosecond laser direct writing technology, and the metal oxide can be directly sintered without other treatment due to high femtosecond laser peak power, so that the method is convenientand quick. The method is suitable for any hydrophilic or hydrophobic substrate, and can realize the preparation of any metal oxide micro-nano structure with high precision, cross scale and high orientation.