Bragg Fiber Taper for Subwavelength Beam Generation

Author

Ma, Lin ; Matsuura, Yuji

Author_Institution

Dept. of Electr. Commun. Eng., Tohoku Univ., Sendai, Japan

Volume

26

Issue

24

fYear

2008

Firstpage

3847

Lastpage

3852

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 Â¿m and a full-width at half-maximum (FWHM) of 0.75 Â¿m was successfully generated by 1.1-Â¿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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2008.927796

Filename

4758670