An integrated-nanophotonics polarization beamsplitter with 2.4 x 2.4 μm2 footprint
An integrated-nanophotonics polarization beamsplitter with 2.4 x 2.4 μm2 footprint
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DOI：
10.1038/nphoton.2015.80
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发表时间：
2015-06-01
期刊：
影响因子：
35
通讯作者：
Menon, Rajesh
中科院分区：
文献类型：
--
作者：
Shen, Bing;Wang, Peng;Menon, Rajesh
我们设计、制作并表征了一种面积为2.4×2.4微米(2)的集成纳米光子偏振分束器，这是目前发现的最小的偏振分束器。采用非线性优化算法对波长为1,550 nm的器件进行了设计。偏振分束器和输入/输出波导可以在单个光刻步骤中制造。实验表明，在32 nm的带宽范围内，平均传输效率大于70%(峰值传输效率接近80%)，消光比大于10dB。模拟结果表明，我们的器件可以承受高达+/-20 nm的器件厚度制造误差。我们还设计、制作和表征了一种模式转换偏振分束器，它不仅分离了两个偏振态，而且将一个多模输入波导连接到两个单模输出波导。
We have designed, fabricated and characterized an integrated-nanophotonics polarization beamsplitter with a footprint of 2.4 x 2.4 mu m(2), which is the smallest polarization beamsplitter ever demonstrated. A nonlinear optimization algorithm was used to design the device for lambda(0) = 1,550 nm. The polarization beamsplitter and the input/output waveguides can be fabricated in a single lithography step. Here, we experimentally show an average transmission efficiency of greater than 70% (peak transmission efficiency of similar to 80%) and an extinction ratio greater than 10 dB within a bandwidth of 32 nm. Simulation results indicate that our device is tolerant to fabrication errors of up to +/- 20 nm in the device thickness. We also designed, fabricated and characterized a mode-converting polarization beamsplitter, which not only separates the two polarization states but also connects one multimode input waveguide to two single-mode output waveguides.