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Strong hybridization of edge and bulk states in dimerized PT-symmetric coupled waveguide chain
- 发表刊物：Optics express
- 摘要：We study mode coupling of an edge state with bulk states in a coupled waveguide chain in the presence of gain and losses. In a low non-Hermiticity regime, it is found that the edge state associated with the interface between two topologically different waveguide chains is well isolated from the bulk states, sharing the exact same features as the well-known Su-Schrieffer-Heeger Model. As the non-Hermiticity increases, the two bands of the overall waveguide chain merge together, which leads to the overlap in the band diagram between the edge state and states of lower bands. We find that before …
- 卷号：25
- 期号：2
- 页面范围：1040-1049
- 是否译文：否
- 发表时间：2017-01-23
- 发布期刊链接：https://opg.optica.org/oe/fulltext.cfm?uri=oe-25-2-1040&id=357320
