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CREOL, The College of Optics & Photonics

Paper by Professor Ayman Abouraddy et al. published in Nature Communications

A paper entitled "Silicon-in-silica spheres via axial thermal gradient in-fibre capillary instabilities" was published on July 31, 2013 in Nature Communications.

The ability to produce small scale, crystalline silicon spheres is of significant technological and scientific importance, yet scalable methods for doing so have remained elusive. Here we demonstrate a silicon nanosphere fabrication process based on an optical fibre drawing technique. A silica-cladded silicon-core fibre with diameters down to 340?nm is continuously fed into a flame defining an axial thermal gradient and the continuous formation of spheres whose size is controlled by the feed speed is demonstrated. In particular, spheres of diameter <500 nm smaller than those produced under isothermal heating conditions are shown and analysed. A fibre with dual cores, p-type and n-type silicon, is drawn and processed into spheres. Spatially coherent break-up leads to the joining of the spheres into a bispherical silicon ‘p–n molecule’. The resulting device is measured to reveal a rectifying I–V curve consistent with the formation of a p–n junction.

http://www.nature.com/ncomms/2013/130731/ncomms3216/full/ncomms3216.html

Posted Thursday, August 1, 2013

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