title: Characterization of liquid-core/liquid-cladding optical waveguides of a sodium chloride solution/water system by computational fluid dynamics.
abstract: A stable liquid/liquid optical waveguide (LLW) was formed using a sheath flow, where a 15% sodium chloride (NaCl) solution functioned as the core solution and water functioned as the cladding solution (15% NaCl/water LLW). The LLW was at least 200 mm in length. The concentration distributions of the liquid core and liquid cladding solutions in the LLW system were predicted by computational fluid dynamics (CFD) to validate the characteristics of the waveguide. The broadening of the region of the fluorescence of Rhodamine B excited by the guided light and the increase in the critical angle of the guided light with the increase in the contact time of the core and the cladding solutions were well explained by CFD calculations. However, no substantial leakage of the guided light was observed despite the considerably large change in the refractive index profile of the LLW; thus, a narrower and longer waveguide was realized.
authors.affiliation: Gunma University, Department of Chemistry and Chemical Biology, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan.
authors.forename: Junya
authors.initials: J
authors.lastname: Kamiyama
authors.forename: Soto
authors.initials: S
authors.lastname: Asanuma
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Murata
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Sugii
authors.forename: Hiroki
authors.initials: H
authors.lastname: Hotta
authors.forename: Kiichi
authors.initials: K
authors.lastname: Sato
authors.forename: Kin-ichi
authors.initials: K
authors.lastname: Tsunoda