Abstract

We demonstrated light confinement in a subwavelength-diameter silica core by addincxg a Bragg multilayer cladding. The output beam properties of Bragg fiber taper were studied using a beam propagation method (BPM), and the result showed a 34% stronger light confinement than that of air-clad silica taper. We optimized the shape of silica core and the Bragg multilayer structure. An ${\rm HE}_{11}$ mode-shaped beam with a wavelength of 0.85$\mu{\rm m}$ and a full-width at half-maximum (FWHM) of 0.75 $\mu{\rm m}$ was successfully generated by 1.1-$\mu{\rm m}$-core Bragg fiber tapers. Our devices may have applications in nanophotonics and nonlinear optics.

© 2008 IEEE

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