研究目的
Investigating the evolution of femtosecond laser direct-writing induced large area of periodic surface structures on As2S3 glass and the fabrication of large-area high spatial frequency LIPSS (HSFL) structures.
研究成果
The study successfully demonstrated a method for fabricating large-area periodic surface structures (LSFL and HSFL) on As2S3 glass using femtosecond laser direct-writing process technology. The interaction between the initial LSFL structures and the laser pulse of the second scanning process induced local field enhancement effect, enabling the fabrication of large-area HSFL structures. This method provides a new approach for manipulating material properties at the nanoscale.
研究不足
The size of the achievable structures is limited by the illumination wavelength, which restricts the applications in the infrared optical regime. The study focuses on As2S3 glass, and the findings may not be directly applicable to other materials.
1：Experimental Design and Method Selection:
The study utilized a Ti: sapphire regenerative amplifier laser system for generating femtosecond laser pulses to induce periodic surface structures on As2S3 glass. The relationship between morphology and pulse overlap rate was established, and local field enhancement effect was utilized to induce the directional splitting of surface periodic structures.
2：Sample Selection and Data Sources:
As2S3 glass samples were prepared by the conventional melt-quenching method. High-purity arsenic and sulfur were used as raw materials.
3：List of Experimental Equipment and Materials:
A commercial Ti: sapphire regenerative amplifier laser system, focusing objective (2.5×, NA = 0.25), and a three-axis moving platform were used.
4：5×, NA = 25), and a three-axis moving platform were used.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser pulses were focused onto the surface of the material, and the sample was fixed on a three-axis moving platform. The study involved two laser scanning processes with different parameters to fabricate LSFL and HSFL structures.
5：Data Analysis Methods:
The evolution of laser-induced periodic surface structures was analyzed through SEM images and simulation of electric field distribution using Lumerical FDTD.
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