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 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 nanometres level, which cause them to absorb or reflect light.
Through the development of a new nanomanufacturing technique, researchers have succeeded in making gold films with virtually infinite arrays of circular perforations as small as 100 nanometres 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 macro scale distances. The researchers’ ability to make these optical metamaterials inexpensively and on large wafers or sheets is what sets this work apart from other techniques.
"One of the biggest problems with nanomaterials has always been their 'scalability'", said Odom, associate professor of chemistry in the Weinberg College of Arts and Sciences. "It’s been very difficult or prohibitively expensive to pattern them over areas larger than about one square millimetre. 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."
For example, if the perforations or holes are patterned into micro scale "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.
Moreover, their optical transmission can be altered 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 also can be superior as optical sensors, and they open the possibility of ultra-small sources of light.
COMPAMED.de; Quelle: Northwestern University