Superluminality in parity-time symmetric Bragg gratings
Li-Ting Wu,
Xin-Zhe Zhang,
Tian-Jing Guo
et al.
Abstract:Parity-time (PT) symmetric Bragg gratings (PTBGs) possess unique features compared to traditional ones. For example, the photonic bandgap of a PTBG can be modified and even closed when the PT symmetry evolves from an exact phase to a broken one, and the complex reflection coefficient of a PTBG is sensitive to the direction of incidence. In this article, we reveal how the superluminal effects of transmission behave following the modified band structure of PTBGs. The superluminality of the directionally sensitiv… Show more
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