Optical Etching to Pattern Microstructures on Plastics by Vacuum Ultraviolet Light.

Area of Science:

• Materials Science
• Optics
• Microfabrication

Background:

• Traditional microfabrication methods can be complex and costly.
• Developing efficient and scalable techniques for plastic microfabrication is crucial for various applications.

Purpose of the Study:

• To propose and demonstrate an optical dry etching method using vacuum ultraviolet light (VUV) for plastic microfabrication.
• To investigate the effectiveness of different VUV wavelengths for etching specific plastics.
• To showcase the fabrication of microfluidic devices using this VUV-based technique.

Main Methods:

• Utilized vacuum ultraviolet (VUV) light at 160 nm and 172 nm for optical dry etching.
• Patterned polymethyl methacrylate (PMMA) and polycarbonate (PC) plastics.
• Investigated the relationship between etching rate, irradiation dose, and VUV wavelength.
• Combined VUV etching with a previously developed optical bonding method.

Main Results:

• Established proportional relationships between etching rate and irradiation dose for both wavelengths.
• Achieved anisotropic cross-sectional profiles in etched plastics.
• Demonstrated successful etching of both PMMA and PC at 160 nm, but only PMMA at 172 nm.
• Successfully fabricated microfluidic devices by combining VUV etching and optical bonding.

Conclusions:

• VUV optical dry etching is an effective method for microfabricating plastic materials.
• The etching efficiency correlates with the photon energy of VUV light and the material's bond dissociation energies.
• This technique offers a simple, scalable, and potentially cost-effective approach for mass production of microfluidic devices and other microstructures.