"Aluminum is useful because it's compatible with microelectronic production methods, but until now the tones produced by plasmonic aluminum nanorods have been muted and washed out," said Link, associate professor of chemistry at Rice and the lead researcher on the study.

 "The key advancement here was to place the nanorods in an ordered array," Link added.

 Olson said the array setup allowed her to tune the pixel's colour in two ways, first by varying the length of the nanorods and second by adjusting the length of the spaces between nanorods.

 Olson's five-micron-square pixels are about 40 times smaller than the pixels used in commercial LCD displays. To make the pixels, she used aluminum nanorods that each measured about 100 nanometres long by 40 nanometres wide.

 She used electron-beam deposition to create arrays - regular arrangements of nanorods - in each pixel.

 Halas and Link said the research team hopes to create an LCD display that uses many of the same components found in today's displays, including liquid crystals, polarisers and individually addressable pixels.

Researchers hope to further develop the display technology and eventually to combine it with other new technologies to create a new material that can sense light in full colour and react with full-colour camouflage displays.

 The research was published in the journal Proceedings of the National Academy of Sciences (PNAS).

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