Anomalous Light Scattering by Topological ${\mathcal{PT}}$-symmetric Particle Arrays
| Autor: | Ling, C. W., Choi, Ka Hei, Mok, T. C., Zhang, Z. Q., Fung, Kin Hung |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Sci. Rep. 6 38049 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/srep38049 |
| Popis: | 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 $\mathcal{PT}$-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 $\mathcal{PT}$-symmetric unit is inserted into the communication channel. Comment: 16 pages, 8 figures |
| Databáze: | arXiv |
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