Anomalous Light Scattering by Topological PT-symmetric Particle Arrays

C. W. Ling, Ka Hei Choi, T. C. Mok, Zhao Qing Zhang, Kin Hung Fung (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)


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.
Original languageEnglish
Article number38049
JournalScientific Reports
Publication statusPublished - 1 Dec 2016

ASJC Scopus subject areas

  • General


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