Exceptional points enhance sensing in an optical microcavity

By Weijian Chen, Ş. Özdemir, Guangming Zhao, Jan Wiersig, Lan Yang. Nature, 2017

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Topological Phases of Non-Hermitian Systems (2018, background): “Such a simple scenario can be implemented in photonic lattices [144] with asymmetric backscattering [79,80] or by using auxiliary microresonators with gain and loss [145,146].”
A review on non-Hermitian skin effect (2022, background): “A regular EP represents the coalescence of two states as schematically illustrated in Figure 2(a), which generally induces a square root singularity, making it more sensitive to the parameter change compared to a Hermitian degenerate point and can be potentially used as a novel mechanism for sensors”
Exceptional points in optics and photonics (2019, background): “[Credits: (A) and (B) reprinted from (99) and”
Anomalous helical edge states in a non-Hermitian Chern insulator (2018, positive): “The exceptional point brings about novel functionalities with no Hermitian counterparts such as unidirectional invisibility [95, 116–118] and enhanced sensitivity [98, 102, 125, 126].”