Lossless and stable propagation of surface plasmon polaritons in quasi- P T potential

We propose a scheme to study the propagation properties of surface plasmon polaritons (SPPs) in a dielectric/metal/dielectric waveguide with a refraction index of the dielectric modulated as quasi- -symmetric potentials. By treating the propagation loss of SPPs as the absorption background, we prove...

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Bibliographic Details
Published in:Optics letters 2024-11, Vol.49 (21), p.6289
Main Authors: Han, Zhengkai, Li, Deen, Ding, Weisheng, Tan, Chaohua
Format: Article
Language:English
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Summary:We propose a scheme to study the propagation properties of surface plasmon polaritons (SPPs) in a dielectric/metal/dielectric waveguide with a refraction index of the dielectric modulated as quasi- -symmetric potentials. By treating the propagation loss of SPPs as the absorption background, we prove that a total gain-loss balance system which allows SPPs losslessly and stably propagating can be achieved. In addition, the propagation robustness of single peak and dipole peak transverse structured SPPs in quasi- -symmetric potentials under noise perturbations is discussed. The results may have certain significance for expanding applications of non-Hermitian optics in micro-/nano-optical information processing.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.538062