Gunma University, Department of Chemistry and Chemical Biology, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan.
Appl Spectrosc. 2013 Dec;67(12):1479-84. doi: 10.1366/13-07096.
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.
使用鞘流形成了稳定的液/液光学波导（LLW），其中 15%氯化钠（NaCl）溶液作为芯溶液，水作为包层溶液（15%NaCl/水 LLW）。LLW 的长度至少为 200mm。通过计算流体动力学（CFD）预测了 LLW 系统中液体芯和液体包层溶液的浓度分布，以验证波导的特性。CFD 计算很好地解释了受导光激发的罗丹明 B 荧光区域的展宽以及导光临界角随芯溶液和包层溶液接触时间增加而增加的现象。然而，尽管 LLW 的折射率分布发生了相当大的变化，但没有观察到导光的明显泄漏；因此，实现了更窄和更长的波导。
