Micro-optical elements fabricated by metal-transparent-metallic-oxides grayscale photomasks

Area of Science:

• Optics and Photonics
• Materials Science
• Microfabrication

Background:

• Three-dimensional (3D) micro-optical elements (MOEs) are crucial for advanced optical systems.
• One-step gray-tone lithography offers an effective method for fabricating these 3D MOEs.
• Existing grayscale mask technologies present limitations in cost-effectiveness and practical application.

Purpose of the Study:

• To investigate the practical technique requirements for metal-transparent-metallic-oxide (MTMO) grayscale masks.
• To evaluate the performance and applicability of MTMO grayscale masks in the fabrication of 3D SiO(2) MOEs.
• To validate the design, fabrication, and protection aspects of MTMO grayscale masks.

Main Methods:

• Fabrication of 3D SiO(2) MOEs using one-step gray-tone lithography.
• Utilization of novel Metal-Transparent-Metallic-Oxide (MTMO) grayscale masks.
• Application of reactive ion etching for pattern transfer.
• Verification of mask design calibration, pattern transfer, resolution, lifetime, and protection.

Main Results:

• Successful fabrication of 3D SiO(2) MOEs was achieved using MTMO grayscale masks.
• Key parameters including design calibration, pattern transfer, resolution, and mask lifetime were thoroughly investigated and verified.
• The practical applicability of MTMO grayscale masks was demonstrated through rigorous testing.

Conclusions:

• Metal-transparent-metallic-oxide (MTMO) grayscale masks are a novel, cost-effective, and highly applicable tool for fabricating 3D micro-optical elements (MOEs).
• The study confirms the viability of MTMO masks for both laboratory research and industrial production of MOEs.
• Further development and application of MTMO grayscale masks are expected to advance micro-optics fabrication.