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Title: Anomalous light scattering by topological PT-symmetric particle arrays
Authors: Ling, CW
Choi, KH
Mok, TC
Zhang, ZQ
Fung, KH 
Issue Date: 2016
Publisher: Nature Publishing Group
Source: Scientific reports, 2016, 6, 38049, p. 1-12 How to cite?
Journal: Scientific reports 
Abstract: Robust topological edge modes may evolve into complex-frequency modes when a physical system becomes non-Hermitian. We show that, while having negligible forward optical extinction cross section, a conjugate pair of such complex topological edge modes in a non-Hermitian PT-symmetric system can give rise to an anomalous sideway scattering when they are simultaneously excited by a plane wave. We propose a realization of such scattering state in a linear array of subwavelength resonators coated with gain media. The prediction is based on an analytical two-band model and verified by rigorous numerical simulation using multiple-multipole scattering theory. The result suggests an extreme situation where leakage of classical information is unnoticeable to the transmitter and the receiver when such a PT-symmetric unit is inserted into the communication channel.
EISSN: 2045-2322
DOI: 10.1038/srep38049
Rights: © The Author(s) 2016
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