In this paper, we proposed a two ports coherent perfect absorber based on antisymmetric metasurface with gain material which is able to effectively regulate the absorption of the coherent incident wave under the condition of unequal incident intensities. This design overcomes the limitation that exists in the previous coherent controller which can only be applied to coherent light of equal intensity without gain material. In the proposed absorber, the metal strips of different lengths are arranged in an antisymmetric manner on the interlayer, a gain material layer is introduced to regulate the unequal intensity coherent light and the electromagnetic response mode which can be selectively strengthened and weakened by modulating the phase difference between two incident waves, and a high coherent absorption under the condition of asymmetric incident wave can be realized. Results show that the proposed absorber achieve coherent perfect absorption at the frequency of 15.25 THz and 17.75 THz, which can change the total absorption in the range from 27.41% to 98.55%, and from 27.55% to 97.88%, respectively. This paper may serve as an important tool for all-optical information transmission and data processing.

中文翻译：

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具有增益材料的基于反对称超表面的相干完美吸收器

在本文中，我们提出了一种基于反对称超表面和增益材料的两端口相干完美吸收器，能够在不等入射强度条件下有效调节相干入射波的吸收。这种设计克服了之前相干控制器中存在的限制，该控制器只能应用于没有增益材料的等强度相干光。在所提出的吸收体中，不同长度的金属条以反对称方式排列在夹层上，引入增益材料层来调节不等强度相干光和电磁响应模式，该模式可以通过调制相位来选择性地增强和减弱。两个入射波之间的差异，并且可以在非对称入射波条件下实现高相干吸收。结果表明，所提出的吸收体在15.25 THz和17.75 THz频率下实现了相干完美吸收，可以分别在27.41％至98.55％和27.55％至97.88％的范围内改变总吸收。本文可作为全光信息传输和数据处理的重要工具。