Nonreciprocal Light Propagation in a Silicon Photonic Circuit

@article{Feng2011NonreciprocalLP,
  title={Nonreciprocal Light Propagation in a Silicon Photonic Circuit},
  author={Liang Feng and Maurice Ayache and Jingqing Huang and Ye-Long Xu and Ming-Hui Lu and Yan-Feng Chen and Yeshaiahu Fainman and Axel Scherer},
  journal={Science},
  year={2011},
  volume={333},
  pages={729 - 733}
}
An engineered metallic-silicon waveguide allows for direction-dependent light propagation. Optical communications and computing require on-chip nonreciprocal light propagation to isolate and stabilize different chip-scale optical components. We have designed and fabricated a metallic-silicon waveguide system in which the optical potential is modulated along the length of the waveguide such that nonreciprocal light propagation is obtained on a silicon photonic chip. Nonreciprocal light transport… 
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Comment on “Nonreciprocal Light Propagation in a Silicon Photonic Circuit”
TLDR
It is shown that the structure demonstrated cannot enable optical isolation because it possesses a symmetric scattering matrix and one cannot construct an optical isolator by incorporating this structure into any system as long as the system is linear and time-independent and is described by materials with a scalar dielectric function.
On chip optical isolator based on non-linear silicon photonic crystal by using asymmetric engineering waveguide
Abstract We propose an optical isolator formed in a nanoscale structure based on non-linear silicon photonic crystal that can be easily realized on an optical integrated chip. The structure comprises…
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