Epp E, Ponnampalam N, McMullin J N, Decorby R G
ECE Dept. and TRLabs, University of Alberta, 2nd Floor, 9107-116 St. N.W., Edmonton, AB, Canada, T6G 2V4.
Opt Express. 2009 Sep 28;17(20):17369-75. doi: 10.1364/OE.17.017369.
We describe the thermal tuning of air-core Bragg waveguides, fabricated by controlled formation of delamination buckles within a multilayer stack of chalcogenide glass and polymer. The upper cladding mirror is a flexible membrane comprising high thermal expansion materials, enabling large tuning of the air-core dimensions for small changes in temperature. Measurements on the temperature dependence of feature heights showed good agreement with theoretical predictions. We applied this mechanism to the thermal tuning of modal cutoff conditions in waveguides with a tapered core profile. Due to the omnidirectional nature of the cladding mirrors, these tapers can be viewed as waveguide-coupled, tunable Fabry-Perot filters.
我们描述了通过在硫族化物玻璃和聚合物的多层堆叠中控制分层褶皱的形成来制造的空芯布拉格波导的热调谐。上包层镜是一种由高热膨胀材料组成的柔性膜，能够在温度发生小变化时对空芯尺寸进行大幅调谐。对特征高度的温度依赖性测量结果与理论预测吻合良好。我们将这种机制应用于具有锥形芯轮廓的波导中模式截止条件的热调谐。由于包层镜的全向特性，这些锥形结构可被视为波导耦合的可调谐法布里 - 珀罗滤波器。
