Polarization rotation and coupling between silicon waveguide and hybrid plasmonic waveguide.
Polarization rotation and coupling between silicon waveguide and hybrid plasmonic waveguide.
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DOI：
10.1364/oe.23.009968
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发表时间：
2015-04
期刊：
影响因子：
3.8
通讯作者：
Sangsik Kim;M. Qi
中科院分区：
文献类型：
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作者：
Sangsik Kim;M. Qi
我们提出了一种偏振旋转和耦合方案，该方案在硅波导中旋转 TE(0) 模式，同时将旋转模式耦合到混合等离子体 (HP(0)) 波导模式。这种偏振旋转可以通过部分蚀刻的非对称混合等离子体波导来实现，该波导由硅带波导、薄氧化物间隔物和由铜、金、银或铝制成的金属帽组成。提出了两种实现方式，一种具有金属盖锥度，一种不具有金属盖锥度，并且还分析了不同的锥度形状（线性和指数）。该器件具有较大的 3 dB 转换带宽（近红外超过 200 nm）和较短的长度（< 5 μm），并通过线性锥形银金属帽实现约 78% 的最大耦合系数。
We present a polarization rotation and coupling scheme that rotates a TE(0) mode in a silicon waveguide and simultaneously couples the rotated mode to a hybrid plasmonic (HP(0)) waveguide mode. Such a polarization rotation can be realized with a partially etched asymmetric hybrid plasmonic waveguide consisting of a silicon strip waveguide, a thin oxide spacer, and a metal cap made from copper, gold, silver or aluminum. Two implementations, one with and one without the tapering of the metal cap are presented, and different taper shapes (linear and exponential) are also analyzed. The devices have large 3 dB conversion bandwidths (over 200 nm at near infrared) and short length (< 5 μm), and achieve a maximum coupling factor of ∼ 78% with a linearly tapered silver metal cap.