MacDonald, K.F., Fedotov, V.A., Stevens, G.C., Pochon, S., Emel'yanov, V.I., Brocklesby, W.S. and Zheludev, N.I.
Light-induced structural transformations and optical nonlinearity in gallium nano-films and self-assembled nanoparticles
At ICONO 2001: XVII International Conference on Coherent and Nonlinear Optics, Belarus.
26 Jun - 01 Jul 2001.
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We report observation of an optical nonlinearity in gallium nano-particles resulting from a light-induced structural transfomlation in the metal which is known for its incredible polymorphism. A freshly cleaved single-mode optical fiber was put into a vacuum chamber and cooled to 100 K. The end of the fiber was exposed to a beam of gallium atoms, leading to the steady deposition of a gallium layer, thus forming a mirror made of just a few picograms of material. The gallium forms nano-particles by self-organization. These particles are relatively uniform in size, with a diameter typically between 80 and 200 nm, which depends on the thickness of the gallium film from which they formed
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