We propose a compound structure constructed by two magnetic cavities with parity-time (PT) symmetric configuration. Through the calculations based on transfer matrix, we find that the structure system has some unique properties that the usual PT symmetric structures do not have. The four incident conditions of the structure produce two sets of transmittance spectra and four different reflectance spectra in which the unusual amplification and absorption are shown. The huge amplification and absorption can be precisely tuned through the magnetic field. Furthermore, the amplification and absorption around the pole can be reversed through the change of incidence directions. Although the analysis of the scattering matrix shows that the transmission and reflection are not nonreciprocal, the diverse modulation ways (magnetic field and incidence directions) will make the structure more useful in the design of photonic switching and optical modulator.

中文翻译：

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奇偶时间对称耦合腔极点的磁光效应

我们提出了一种由具有奇偶时间 (PT) 对称配置的两个磁腔构成的复合结构。通过基于传递矩阵的计算，我们发现该结构体系具有一些通常的PT对称结构所不具有的独特性质。该结构的四种入射条件产生两组透射光谱和四种不同的反射光谱，其中显示了异常放大和吸收。巨大的放大和吸收可以通过磁场精确调整。此外，通过改变入射方向可以逆转极点周围的放大和吸收。虽然散射矩阵的分析表明透射和反射不是互易的，