Optical applications based on fast and slow light effects force the usage of metamaterials famous for their flexible dispersion properties. In this work, we apply the unique optical nonlocality of metal nanorod-based epsilon-near-zero (ENZ) metamaterials along with the chirp of femtosecond laser pulses for astonishing control of these effects. We demonstrate the switching between the fast and slow light phenomena via the change of the angle of incidence and/or the central wavelength of chirped pulses in the vicinity of metamaterial zero-transmission regime mediated by the ENZ nonlocality. We elucidate that the laser chirp allows one to manipulate and enhance the fast–slow light phenomena.

中文翻译：

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对ε近零超材料中快慢光效应的线性调频驱动控制

基于快光和慢光效应的光学应用迫使人们使用以其灵活的色散特性而闻名的超材料。在这项工作中，我们应用基于金属纳米棒的ε近零（ENZ）超材料的独特光学非定域性以及飞秒激光脉冲的啁啾声来对这些效应进行惊人的控制。我们通过改变入射角和/或由 ENZ 非定域性介导的超材料零传输区域附近啁啾脉冲的中心波长来演示快光和慢光现象之间的切换。我们阐明激光啁啾允许人们操纵和增强快慢光现象。