Title: $\mathcal{P}\mathcal{T}$-Symmetric Coherent Perfect Absorber with Graphene Show Chinese title

Title: $\mathcal{P}\mathcal{T}$-具有石墨烯的对称相干完美吸收器

Abstract: We investigate $\mathcal{PT}$-symmetric coherent perfect absorbers (CPAs) in the TE mode solution of a linear homogeneous optical system surrounded by graphene sheets. It is revealed that presence of graphene sheets contributes the enhancement of absorption in a coherent perfect absorber. We derive exact analytic expressions, and work through their possible impacts on lasing threshold and CPA conditions. We point out roles of each parameter governing optical system with graphene and show that optimal conditions of these parameters give rise to enhancement and possible experimental realization of a CPA laser. Presence of graphene leads the required gain amount to reduce considerably based on its chemical potential and temperature. We obtain that relation between system parameters decides the measure of CPA condition. We find out that graphene features contributing to resonance effect in graphene sheets are rather preferable to build a better coherent perfect absorber. Show Chinese abstract

Abstract: 我们研究了在由石墨烯片包围的线性均匀光学系统的TE模式解中的$\mathcal{PT}$对称相干完美吸收器(CPAs)。 结果表明，石墨烯片的存在有助于增强相干完美吸收器的吸收效果。 我们推导出了精确的解析表达式，并探讨了它们对激光阈值和CPA条件的可能影响。 我们指出了每个控制含石墨烯的光学系统的参数的作用，并表明这些参数的最佳条件会导致增强以及CPA激光的可能实验实现。 石墨烯的存在使得所需的增益量显著减少，这取决于其化学势和温度。 我们得出结论，系统参数之间的关系决定了CPA条件的度量。 我们发现，有助于石墨烯片中共振效应的石墨烯特性更有利于构建更好的相干完美吸收器。