Using Magnets for New Lenses

Graduate student Mojtaba Falahati holds a homemade lens, fabricated with a magnetic liquid mold. (Source: WSU)

Researchers from Washington State University and Ohio State University have developed a low-cost, easy way to make custom lenses that could help manu­facturers avoid the expensive molds required for optical manu­facturing. Led by Lei Li, assistant professor in the School of Mechanical and Materials Engi­neering, and graduate student Mojtaba Falahati, the researchers developed a liquid mold from droplets that they can manipulate with magnets to create lenses in a variety of shapes and sizes.

High-quality lenses are increasingly used in everything from cameras, to self-driving cars, and virtually all robotics, but the traditional molding and casting processes used in their manu­facturing require sophis­ticated and expensive metal molds. So, manufacturers are mostly limited to mass producing one kind of lens. “The molds are precisely finished and are difficult to make,” said Li. “It isn’t worthwhile to make a mold for low-volume production.”

The researchers ran into the problem firsthand as they searched for lenses for their work to develop a portable labora­tory reader on a phone. They first tried to make their own lenses using 3D printing but found it difficult to control the lens shape. They then came up with the idea of using magnets and the surface tension of liquids to literally create free-flowing molds.

They placed tiny, magnetic iron particles into liquid droplets and built a device to surround the droplets with magnets. They then poured the plastic material used in lenses over the droplet. As they applied a magnetic field, the droplet took on a conical lens shape – creating a mold for the plastic lens material. Once they cured the plastic, it hardened and had the same optical properties and imaging quality as a commer­cially purchased lens. The liquid droplet remains separate and can be re-used.

The magnets can be moved to change the magnetic field, the shape of the mold, and the resulting lens. The researchers also used bigger or smaller droplets to create lenses of varying sizes. “We brought the concept of inter­facial tension to the field of optics by intro­ducing an inno­vative control­lable liquid mold,” said Li. “This novel process allowed us to regulate the shape of a magnetic drop and to create lenses without having to fabri­cate expensive molds.” (Source: WSU)

Reference: M. Falahati et al.: Fabrication of polymeric lenses using magnetic liquid molds, Appl. Phys. Lett. 114, 203701 (2019); DOI: 10.1063/1.5090511

Link: School of Mechanical and Materials Engineering, Washington State University, Pullman, USA

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