التفاصيل البيبلوغرافية
| العنوان: |
Topologically protected broadband rerouting of propagating waves around complex objects. |
| المؤلفون: |
Hayran, Zeki, Hassani Gangaraj, Seyyed Ali, Monticone, Francesco |
| المصدر: |
Nanophotonics (21928606); Aug2019, Vol. 8 Issue 8, p1371-1378, 8p |
| مصطلحات موضوعية: |
CONDENSED matter physics, ELECTROMAGNETIC wave propagation, TOPOLOGICAL insulators, PLANE wavefronts, ROUTING algorithms, TOPOLOGICAL fields, PLASMONICS |
| مستخلص: |
Achieving robust propagation and guiding of electromagnetic waves through complex and disordered structures is a major goal of modern photonics research, for both classical and quantum applications. Although the realization of backscattering-free and disorder-immune guided waves has recently become possible through various photonic schemes inspired by topological insulators in condensed matter physics, the interaction between such topologically protected guided waves and free-space propagating waves remains mostly unexplored, especially in the context of scattering systems. Here, we theoretically demonstrate that free-space propagating plane waves can be efficiently coupled into topological one-way surface waves, which can seamlessly flow around sharp corners and electrically large barriers and release their energy back into free space in the form of leaky-wave radiation. We exploit this physical mechanism to realize topologically protected wave-rerouting around an electrically large impenetrable object of complex shape, with transmission efficiency exceeding 90%, over a relatively broad bandwidth. The proposed topological wave-rerouting scheme is based on a stratified structure composed of a topologically nontrivial magnetized plasmonic material coated by a suitable isotropic layer. Our results may open a new avenue in the field of topological photonics and electromagnetics, for applications that require engineered interactions between guided waves and free-space propagating waves, including for complex beam-routing systems and advanced stealth technology. More generally, our work may pave the way for robust defect/damage-immune scattering and radiating systems. [ABSTRACT FROM AUTHOR] |
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