Researcher Develops Lens in a Variety of Shapes and Sizes

Wednesday, May 22, 2019 - 12:48

Research teams from Washington State University and Ohio State University have developed a liquid mold from droplets that they can manipulate with magnets to create lenses in a variety of shapes and sizes.

According to the EurekAlert, the research that has been led by Lei Li, assistant professor in the School of Mechanical and Materials Engineering, and graduate student, Mojtaba Falahati, is featured on the cover of the journal, Applied Physics Letters.

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."

Researchers 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," added Li. "This novel process allowed us to regulate the shape of a magnetic drop and to create lenses without having to fabricate expensive molds."

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