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Micro Attach Lenses For Smartphones & Tablets Coming

By Wire Service | Sunday | 18/11/2012

Major smartphone brands and tablet makers may soon be able to turn their devices into top end cameras via the use of a breakthrough attachable lens.

A British research team is believed to be working with several brands to launch a super-thin lens that can function either as a convex or a concave lens via the flick of a switch.

Dr Shuang Zhang, a reader in metamaterials at the University of Birmingham who led the research team told the Daily Telegraph in the UK : "This new device will give greater flexibility in designing and adding new functionalities to optical systems."

The research team claims the new lens means a scene can either be magnified or viewed at wide angle similar to an SLR lens.

"The focusing properties of the same lens can be altered between a convex lens and a concave lens at will. In addition Zhang said the compact size, and the flat nature of the lens could useful."

The scientists created the lens, known as a plasmonic metalens, by layering gold nano-rods onto a thin, flat shard of glass half the width of a human hair.

Conventional lenses use curved glass surfaces to alter the direction of the light as it enters a camera to either magnify an object or make it smaller.

A layer of gold rods on top of the new lens allows this effect to be achieved on a flat surface by controlling the direction the light travels as it passes through the glass.

A prototype of the lens created by the researchers has an aperture of 80 micrometers - roughly the width of a human hair - and a focal length of 60 micrometers.

Changing the lens from its wide angle mode to the zoom mode is achieved by switching the polarisation of the light as it hits the lens. This can be achieved by placing a filter in front of the lens.

Their findings are published in the journal of Nature Communications.

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Apr/May 2011 issue

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