Researchers fabricate complex optical components from fluids

Researchers fabricate complex optical components from fluids
The researchers used their new method to make optical components with various geometries — including toroid and trefoil shapes — and sizes up to 200 mm as well as freeform surfaces. The lenses exhibited surface qualities similar to the best polishing technologies available while being orders of magnitude quicker and simpler to make. Credit: Technion – Israel Institute of Technology

Researchers have developed a way to create freeform optical components by shaping a volume of curable liquid polymer. The new method is poised to enable faster prototyping of customized optical components for a variety of applications including corrective lenses, augmented and virtual reality, autonomous vehicles, medical imaging and astronomy.

Common devices such as eyeglasses or cameras rely on lenses—optical components with spherical or cylindrical surfaces, or slight deviations from such shapes. However, more advanced optical functionalities can be obtained from surfaces with complex topographies. Currently, fabricating such freeform optics is very difficult and expensive because of the specialized equipment required to mechanically process and polish their surfaces.

"Our approach to making freeform optics achieves extremely smooth surfaces and can be implemented using basic equipment that can be found in most labs," said research team leader Moran Bercovici from the Technion—Israel Institute of Technology. "This makes the technology very accessible, even in low resource settings."

In Optica, Optica Publishing Group's journal, Bercovici and colleagues show that their new technique can be used to fabricate freeform components with sub-nanometer surface roughness in just minutes. Unlike other prototyping methods such as 3D printing, the fabrication time remains short even if the volume of the manufactured increases.

"Currently, optical engineers pay tens of thousands of dollars for specially designed freeform components and wait months for them to arrive," said Omer Luria, one of the contributors to the paper. "Our technology is poised to radically decrease both the waiting time and the cost of complex optical prototypes, which could greatly speed up the development of new optical designs."

Researchers fabricate complex optical components from fluids
Freeform optical components with sub-nanometer surface roughness are fabricated within minutes by shaping liquid volumes. Credit: Technion – Israel Institute of Technology

From eyeglasses to complex optics

The researchers decided to develop the new method after learning that 2.5 billion people around the world don't have access to corrective eyewear. "We set out to find a simple method for fabricating high quality optical components that does not rely on mechanical processing or complex and expensive infrastructure," said Valeri Frumkin, who first developed the method in Bercovici's lab. "We then discovered that we could expand our method to produce much more complex and interesting optical topographies."

One of the primary challenges in making optics by curing a liquid polymer is that for optics larger than about 2 millimeters, gravity dominates over surface forces, which causes the liquid to flatten into a puddle. To overcome this, the researchers developed a way to fabricate lenses using liquid polymer that is submerged in another liquid. The buoyancy counteracts gravity, allowing surface tension to dominate.

With gravity out of the picture, the researchers could fabricate smooth optical surfaces by controlling the surface topography of the lens liquid. This entails injecting the lens liquid into a supportive frame so that the lens liquid wets the inside of the frame and then relaxes into a stable configuration. Once the required topography is achieved, the liquid can be solidified by UV exposure or other methods to complete the fabrication process.

After using the liquid fabrication method to make simple spherical lenses, the researchers expanded to optical components with various geometries—including toroid and trefoil shapes—and sizes up to 200 mm. They show that the resulting lenses exhibited qualities similar to the best polishing technologies available while being orders of magnitude quicker and simpler to make. In the work published in Optica, they further expanded the method to create freeform surfaces, by modifying the shape of the supportive frame.

Infinite possibilities

"We identified an infinite range of possible optical topographies that can be fabricated using our approach," said Mor Elgarisi, the paper's lead author. "The method can be used to make components of any size, and because liquid surfaces are naturally smooth, no polishing is required. The approach is also compatible with any liquid that can be solidified and has the advantage of not producing any waste."

The researchers are now working to automate the fabrication process so that various optical topographies can be made in a precise and repeatable way. They are also experimenting with various optical polymers to find out which ones produce the best .


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More information: Mor Elgarisi et al, Fabrication of freeform optical components by fluidic shaping, Optica (2021). DOI: 10.1364/OPTICA.438763
Journal information: Optica

Citation: Researchers fabricate complex optical components from fluids (2021, November 18) retrieved 29 November 2021 from https://phys.org/news/2021-11-fabricate-complex-optical-components-fluids.html
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