Experimentally obtained image of a Fresnel zone plate (left) for focusing light that is
fabricated with plasmon-assisted etching. A two-dimensional array of pillar-supported
bowtie nanoantennas [zoomed in image (right)] comprises this flat lens.
(January 27, 2016) Researchers from the University of Illinois at Urbana-Champaign have developed a simplified approach to fabricating flat, ultrathin optics. The new approach enables simple etching without the use of acids or hazardous chemical etching agents.
“Our method brings us closer to making do-it-yourself optics a reality by greatly simplifying the design iteration steps,” explained Kimani Toussaint, an associate professor of mechanical science and engineering who led the research published this week in Nature Communications. “The process incorporates a nanostructured template that can be used to create many different types of optical components without the need to go into a cleanroom to make a new template each time a new optical component is needed.
“In recent years, the push to foster increased technological innovation and basic scientific and engineering interest from the broadest sectors of society has helped to accelerate the development of do-it-yourself (DIY) components, particularly those related to low-cost microcontroller boards,” Toussaint remarked. “Simplifying and reducing the steps between a basic design and fabrication is the primary attraction of DIY kits, but typically at the expense of quality. We present plasmon-assisted etching as an approach to extend the DIY theme to optics with only a modest tradeoff in quality, specifically, the table-top fabrication of planar optical components.”