Direct formation of grating structures on silicon using KrF laser radiation

Area of Science:

• Materials Science
• Nanotechnology
• Laser Physics

Background:

• Surface grating fabrication is crucial for various optical and electronic applications.
• Precise control over nanoscale surface morphology is essential for advanced material properties.

Purpose of the Study:

• To investigate the fabrication of surface grating structures on single crystal silicon.
• To determine the effectiveness of laser irradiation for creating periodic nanostructures.

Main Methods:

• Irradiation of single crystal silicon with two coherent interfering beams of 248-nm laser light.
• Utilizing energy densities ranging from 1.4 to 1.8 J cm(-2).
• Characterization of the resulting surface structures.

Main Results:

• Successfully produced surface grating structures with a periodicity of 1.46 microm and a depth of modulation of 20 nm.
• The observed structures are consistent with the melting and resolidification of the silicon surface layer.
• Demonstrated the feasibility of laser-induced periodic surface structuring (LIPSS) on silicon.

Conclusions:

• 248-nm laser irradiation is an effective method for fabricating nanoscale surface gratings on silicon.
• The process relies on controlled melting and resolidification of the material surface.
• This technique offers a pathway for creating tailored surface topographies for optoelectronic devices.