Title :
Bragg Fiber Taper for Subwavelength Beam Generation
Author :
Ma, Lin ; Matsuura, Yuji
Author_Institution :
Dept. of Electr. Commun. Eng., Tohoku Univ., Sendai, Japan
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 HE11 mode-shaped beam with a wavelength of 0.85 ¿m and a full-width at half-maximum (FWHM) of 0.75 ¿m was successfully generated by 1.1-¿m-core Bragg fiber tapers. Our devices may have applications in nanophotonics and nonlinear optics.
Keywords :
light propagation; optical fibre cladding; optical multilayers; silicon compounds; Bragg fiber taper; Bragg multilayer cladding; air-clad silica taper; beam propagation method; light confinement; mode-shaped beam; size 1.1 mum; subwavelength beam generation; subwavelength-diameter silica core; wavelength 0.85 mum; Fiber nonlinear optics; Nonhomogeneous media; Nonlinear optics; Optical fiber communication; Optical fiber devices; Optical fibers; Optical propagation; Optical sensors; Optical waveguides; Silicon compounds; Optical device fabrication; optical fibers; optical waveguides;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2008.927796
