Coupling light into a slow-light photonic-crystal waveguide from a free-space normally-incident beam.
Coupling light into a slow-light photonic-crystal waveguide from a free-space normally-incident beam.
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DOI：
10.1364/oe.21.015144
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发表时间：
2013-07
期刊：
影响因子：
3.8
通讯作者：
P. Hamel;P. Grinberg;C. Sauvan;P. Lalanne;A. Baron;A. Yacomotti;I. Sagnes;F. Raineri;K. Bencheikh;J. Levenson
中科院分区：
文献类型：
--
作者：
P. Hamel;P. Grinberg;C. Sauvan;P. Lalanne;A. Baron;A. Yacomotti;I. Sagnes;F. Raineri;K. Bencheikh;J. Levenson
我们提出了一种耦合器的设计，允许垂直入射光耦合从自由空间到单模光子晶体波导工作在慢光制度。数值三维计算表明，提取效率高达80%，可以实现非常大的组指数高达100。我们通过实验证明了器件的可行性，通过耦合和提取光从光子晶体波导在一个大的组指数范围（从10到60）。测量结果与理论预测吻合得很好。我们还数值研究了各种几何参数对耦合器性能的影响。
We present a coupler design allowing normally-incident light coupling from free-space into a monomode photonic crystal waveguide operating in the slow-light regime. Numerical three-dimensional calculations show that extraction efficiencies as high as 80% can be achieved for very large group indices up to 100. We demonstrate experimentally the device feasibility by coupling and extracting light from a photonic crystal waveguide over a large group-index range (from 10 to 60). The measurements are in good agreement with theoretical predictions. We also study numerically the impact of various geometrical parameters on the coupler performances.