Ye Yuqian, Hay Darrick, Shi Zhimin
Opt Lett. 2016 Jul 15;41(14):3359-62. doi: 10.1364/OL.41.003359.
We study the coherent perfect absorption (CPA) of a chiral structure and derive analytically the CPA condition for transversely isotropic chiral structures in circular polarization bases. The coherent absorption of such a chiral system is generally polarization dependent and can be tuned by the relative phase between the coherent input beams. To demonstrate our theoretical predictions, a chiral metamaterial absorber operating in the terahertz frequency range is optimized. We numerically demonstrate that a coherent absorption of 99.5% can be achieved. Moreover, we show that an optimized CPA chiral structure can be used as an interferometric control of polarization state of the output beams with constant output intensity.
我们研究了手性结构的相干完美吸收（CPA），并在圆偏振基中解析推导了横向各向同性手性结构的CPA条件。这种手性系统的相干吸收通常与偏振有关，并且可以通过相干输入光束之间的相对相位进行调节。为了验证我们的理论预测，对一种工作在太赫兹频率范围的手性超材料吸收体进行了优化。我们通过数值模拟证明可以实现99.5%的相干吸收。此外，我们还表明，优化后的CPA手性结构可以用作输出光束偏振态的干涉控制，且输出强度恒定。
