New nanofabrication technique paves way for materials with exceptional optical properties

November 14th, 2007 - 1:48 am ICT by admin  
The scientists say the new fabrication technique, known as soft lithography, offers many significant advantages over existing techniques, including the ability to scale-up the manufacturing process to produce devices in large quantities.

The ability to make these optical metamaterials inexpensively and on large wafers or sheets is also what sets this work apart from other techniques, they say.

The optical nanomaterials in this research are called ‘plasmonic metamaterials’ because their unique physical properties originate from shape and structure rather than material composition only.

Two examples of metamaterials in the natural world are peacock feathers and butterfly wings. Their brightly coloured patterns are due to structural variations at the hundreds of nanometers level, which cause them to absorb or reflect light.

During the course of their research, university chemist Teri Odom and her colleagues developed a new nanomanufacturing technique to successfully craft gold films with virtually infinite arrays of circular perforations as small as 100 nanometers in diameter - 500 to 1,000 times smaller than the diameter of a human hair.

On a magnified scale, these perforated gold films look like Swiss cheese except the perforations are well-ordered and can spread over macroscale distances.

If for example, the perforations or holes are patterned into microscale “patches,” they show dramatically different transmission behaviour of light compared to an infinite array of holes.

The patches appear to focus light while the infinite arrays do not.

“One of the biggest problems with nanomaterials has always been their ’scalability’. It’s been very difficult or prohibitively expensive to pattern them over areas larger than about one square millimetre,” said Odom, associate professor of chemistry in the university’s Weinberg College of Arts and Sciences.

“This research is exciting not only because it demonstrates a new type of patterning technique that is cheap, but also one that can produce very high quality optical materials with interesting properties,” she said.

Prof. Odom said it was possible to alter the optical transmission of these plasmonic metamaterials simply by changing the geometry of perforations rather than having to “cook” a new composition of materials.

“This feature makes them very attractive in terms of tuning their behaviour to a given need with ease. These materials can also be superior as optical sensors, and they open the possibility of ultra-small sources of light,” said Prof. Odom.

“Furthermore, given their precise organization, they can serve as templates for making their own clones or for making other ordered structures at the nanoscale, such as arrays of nanoparticles,” she said.

“This work is exactly the kind of high-risk, high-potential transformative research NSF’s Division of Materials Research is interested in supporting,” added Harsh Deepak Chopra, program manager at the National Science Foundation (NSF), which funded the research.

“The early results are extremely promising and suggest a whole new generation of optical devices,” Chopra said.

The research appears as the cover story in the September 2007 issue of the journal Nature Nanotechnology. (ANI)

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