3D Printing of a PDMS Cylindrical Microlens Array with 100% Fill-Factor

Area of Science:

• Optoelectronics
• Microfabrication
• Materials Science

Background:

• Cylindrical microlens arrays (CMLAs) are crucial for optoelectronic devices.
• High fill-factor CMLAs enhance signal-to-noise ratio and reduce stray light.
• Current CMLA fabrication methods are complex and expensive, hindering mass production.

Purpose of the Study:

• To develop a simple, efficient, and low-cost manufacturing method for high fill-factor CMLAs.
• To demonstrate the control over CMLA profile and fill-factor for optical performance optimization.
• To showcase the versatility of the method for fabricating specialized microlens structures.

Main Methods:

• Electric-field-driven (EFD) microscale 3D printing of polydimethylsiloxane (PDMS).
• Adjustment of printing parameters to control CMLA geometry and fill-factor.
• Fabrication of standard and custom-shaped CMLAs, including dual-microlens arrays.

Main Results:

• Successful fabrication of CMLAs with high fill-factors using the EFD 3D printing method.
• Demonstrated control over CMLA morphology and optical properties, including image projection and light diffraction.
• Prepared cylindrical dual-microlens arrays with double-focusing capabilities and custom-shaped microlenses.

Conclusions:

• The proposed EFD microscale 3D printing offers a viable, cost-effective route for mass production of large-area CMLAs.
• This method enables precise control over CMLA characteristics, leading to improved optical performance.
• The technology provides a flexible platform for fabricating diverse microlens designs for various applications.