Parity-time chain of whispering-gallery mode resonators
Phang, Sendy and Vukovic, Ana and Creagh, Stephen and Benson, Trevor M. and Gradoni, Gabriele and Sewell, Phillip D. (2015) Parity-time chain of whispering-gallery mode resonators. In: META15, the 6th International Conference on Metamaterials, Photonic Crystals and Plasmonics, 4-7 Aug 2015, New York, USA.
The paper analyses the dispersion characteristics of an infinitely long PT chain made of whispering gallery resonators with gain/loss modulation. The results show that the appearance of the threshold breaking point depends not only on both of coupling and gain/loss modulation but also on the Bloch phase. The Bloch phase is seen as an additional parameter that can reduce or even completely eliminate PT-breaking threshold.
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