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Submicron and nano-diameter silica wires for optical wave guiding

Based on the exact solutions of the Maxwell's equations, we have theoretically studied basic properties of submicron and nano-diameter air-cladding silica-wire waveguides, the single-mode condition and the modal field of the fundamental modes have been obtained. Silica wires with diameters of 100-1000nm and lengths ranging from hundreds of microns to over 1 millimeter have been fabricated, SEM examination shows that they have uniform diameters and smooth surfaces, which are favorable for optical wave guiding. Light has been sent into these wires by optical coupling. Guiding light through a bent wire is also demonstrated. These wires are promising for assembling photonic devices on a micron or submicron scale.