Liu Wenbo, Yang Rui, Zhao Donghao
Opt Lett. 2024 Mar 15;49(6):1552-1555. doi: 10.1364/OL.517710.
We propose an asymmetry transmissive (AT) Helmholtz resonator metamaterial to interact with dual incidences of different polarizations from opposite directions to achieve coherent perfect absorption at a terahertz regime. More specifically, the proposed design will solely allow the x-polarized incidence tunnel into the Helmholtz resonator cavity array with roughly half the energy reflected. Meanwhile, the transmitted fields will be converted into the y-polarized counterparts so as to go out through the metamaterial and finally coherent canceled with the partially reflected fields of the other incidence. Our design, introducing the Helmholtz resonator array in the electromagnetics with an extension of the principle of polarization conversion under the coherent perfect absorption, should pave the way for the quest of building up more advanced wave trapping meta-devices for various applications in different disciplines.
我们提出了一种非对称透射（AT）亥姆霍兹共振器超材料，用于与来自相反方向的不同极化的双入射相互作用，以在太赫兹频段实现相干完美吸收。更具体地说，所提出的设计将仅允许x极化入射以大约一半的能量反射进入亥姆霍兹共振器腔阵列。同时，透射场将被转换为y极化场，以便通过超材料射出，并最终与另一个入射的部分反射场相干相消。我们的设计在电磁学中引入了亥姆霍兹共振器阵列，并扩展了相干完美吸收下的极化转换原理，应为寻求构建用于不同学科各种应用的更先进的波捕获超器件铺平道路。
