Xiong Xiao, Zou Chang-Ling, Ren Xi-Feng, Guo Guang-Can
Key Lab of Quantum Information, University of Science and Technology of China, Hefei 230026, PR China.
Opt Express. 2013 Jul 15;21(14):17097-107. doi: 10.1364/OE.21.017097.
We proposed a polarization rotator inspired by stimulated Raman adiabatic passage model from quantum optics, which is composed of a signal waveguide and an ancillary waveguide. The two orthogonal modes in signal waveguide and the oblique mode in ancillary waveguide form a Λ-type three-level system. By controlling the width of signal waveguide and the gap between two waveguides, adiabatic conversion between two orthogonal modes can be realized in the signal waveguide. With such adiabatic passage, polarization conversion is completed within 150 μm length, with the efficiencies over 99% for both conversions between horizontal polarization and vertical polarization. In addition, such a polarization rotator is quite robust against fabrication error, allowing a wide range of tolerances for the rotator geometric parameters. Our work is not only significative to photonic simulations of coherent quantum phenomena with engineered photonic waveguides, but also enlightens the practical applications of these phenomena in optical device designs.
我们提出了一种受量子光学中的受激拉曼绝热通道模型启发的偏振旋转器，它由一个信号波导和一个辅助波导组成。信号波导中的两个正交模式和辅助波导中的倾斜模式形成一个Λ型三能级系统。通过控制信号波导的宽度和两个波导之间的间隙，可以在信号波导中实现两个正交模式之间的绝热转换。通过这种绝热通道，在150μm的长度内完成偏振转换，水平偏振和垂直偏振之间的两种转换效率均超过99%。此外，这种偏振旋转器对制造误差具有很强的鲁棒性，允许旋转器几何参数有很宽的公差范围。我们的工作不仅对利用工程光子波导进行相干量子现象的光子模拟具有重要意义，而且为这些现象在光学器件设计中的实际应用提供了启示。
