Jianming Wen et al., report the modeling of on-chip optical nonreciprocity with an active microcavity. On-chip nonreciprocal light transport holds a great impact on optical information processing and communications based upon integrated photonic devices. By harvesting gain-saturation nonlinearity, they recently demonstrated on-chip optical asymmetric transmission at telecommunication bands with superior nonreciprocal performances using only one active whispering-gallery-mode microtoroid resonator, beyond the commonly adopted magneto-optical (Faraday) effect. Here, detailed theoretical analysis is presented with respect to the reported scheme. Despite the fact that their model is simply the standard coupled-mode theory, it agrees well with the experiment and describes the essential one-way light transport in this nonreciprocal device. Further discussions, including the connection with the second law of thermodynamics and Fano resonance, are also briefly made in the end.
Jianming Wen , Xiaoshun Jiang, Mengzhen Zhang , Liang Jiang , Shiyue Hua , Hongya Wu, Chao Yang and Min Xiao – Photonics 2015, 2, 498-508; doi:10.3390/photonics2020498.
Publication Date: May 13, 2015