Wang Qin, Zhang Liwei
Appl Opt. 2019 Nov 1;58(31):8486-8494. doi: 10.1364/AO.58.008486.
The absorption characteristics of one-dimensional photonic crystals embedded with Dirac semimetal-dielectric defect layers are studied using the transfer matrix method. Numerical results show that our proposed structure can realize near-perfect narrow absorption for its strong field localization effects. The absorption frequency is tunable by adjusting the Fermi energy of the Dirac semimetal, temperature, permittivity of the dielectric, and the structural parameters. Moreover, double or multiple absorption channels can be achieved by changing the structure. Furthermore, the absorption performance is wide-angle and insensitive to polarization of the incident wave. Such properties exhibit potential value in designing selective absorbers and thermal detectors.
采用转移矩阵法研究了嵌入狄拉克半金属 - 电介质缺陷层的一维光子晶体的吸收特性。数值结果表明，我们提出的结构由于其强场局域化效应可实现近乎完美的窄带吸收。通过调节狄拉克半金属的费米能、温度、电介质的介电常数和结构参数，吸收频率是可调的。此外，通过改变结构可以实现双吸收通道或多吸收通道。而且，吸收性能具有广角性且对入射波的偏振不敏感。这些特性在设计选择性吸收器和热探测器方面展现出潜在价值。
