Pure Dielectric Waveguides Enable Compact, Ultrabroadband Wave Plates
Pure Dielectric Waveguides Enable Compact, Ultrabroadband Wave Plates
复制标题
纯电介质波导可实现紧凑型超宽带波片
DOI：
10.1109/jphot.2016.2597447
复制
发表时间：
2016-10-01
影响因子：
2.4
通讯作者：
Li, Jun
中科院分区：
文献类型：
--
作者：
Guo, Jianjun;Liang, Yao;Li, Jun
控制芯片上光的偏振的能力对于许多应用来说至关重要。在这里，我们展示了一种基于纯介电波导的用于硅光子学的超宽带四分之一波片。利用双折射的概念，在纳米光子波导中的两个正交偏振模式之间引入π/2的相位滞后，使得准线偏振模式转变为准圆偏振模式，并伴随着由于自旋轨道相互作用而产生的纵向光学涡旋分量。我们的器件超紧凑 (2.3 μm)，具有低插入损耗（约 0.05 dB），并且可实现 280 nm（约 1.55 μm）的超宽工作带宽。我们还提出了一种半波片结构，它既可以用作准圆偏振模式的手性转换器，也可以用作准线偏振模式的偏振旋转器。这些结果可能会在许多领域找到重要的应用，例如芯片上的集成量子计算和偏振处理。
The ability to manipulate polarization of light on a chip is of fundamental importance for many applications. Here, we demonstrate an ultrabroadband quarter-wave plate for silicon photonics based on pure dielectric waveguides. The concept of birefringence is used to introduce a phase lag of π/2 between two orthogonally polarized modes in nanophotonic waveguides, such that a quasi-linearly polarized mode is converted into a quasi-circularly polarized mode, which is accompanied with a longitudinal optical vortex component due to the spin-orbit interaction. Our device is ultracompact (2.3 μm) with low insertion losses (around 0.05 dB), and it allows for an ultrabroad operation bandwidth of 280 nm around 1.55 μm. We also propose a half-wave plate structure, which can either serve as a chiral converter for quasi-circularly polarized modes or a polarization rotator for quasi-linearly polarized modes. These results may find important applications in many fields, such as integrated quantum computing and polarization handling on a chip.