Blazed grating fabrication through gray-scale Xray lithography

Area of Science:

• Optics and Photonics
• Materials Science
• Nanofabrication

Background:

• Diffractive optical elements are crucial for manipulating light.
• Traditional grating fabrication methods face limitations in efficiency and substrate conformity.
• X-ray lithography offers high resolution for micro/nanofabrication.

Purpose of the Study:

• To develop a novel method for fabricating high-performance blazed gratings.
• To characterize the properties of gratings produced by gray-scale X-ray lithography.
• To demonstrate the versatility of the technique for arbitrary substrate shapes.

Main Methods:

• Gray-scale X-ray lithography was employed for grating fabrication.
• Resist characterization was performed to optimize the process.
• Fabrication was conducted at varying distances from the X-ray mask.

Main Results:

• Successfully fabricated blazed gratings with high efficiency.
• Achieved low parasitic light, indicating high optical quality.
• Demonstrated high groove quality and uniformity.
• Showcased the ability to pattern gratings on substrates of arbitrary shapes.

Conclusions:

• Gray-scale X-ray lithography is a viable technique for producing high-quality blazed gratings.
• The method offers flexibility in substrate choice and shape.
• The fabricated gratings exhibit excellent optical performance characteristics.