Wu Jipeng, Jiang Leyong, Guo Jun, Dai Xiaoyu, Xiang Yuanjiang, Wen Shuangchun
Opt Express. 2016 Jul 25;24(15):17103-14. doi: 10.1364/OE.24.017103.
In this article, we have theoretically demonstrated that the perfect absorption at infrared frequencies can be achieved and controlled by using a graphene-hexagonal Boron Nitride (hBN) hyper crystal. hBN, the latest natural hyperbolic material, can be regarded as an excellent substrate to form a hyper crystal with graphene. Although the perfect absorption by a half-space of hBN crystal can be achieved due to its high optical anisotropy, but the perfect absorption can only appear at certain fixed wavenumber and incidence angle. By introducing a graphene-hBN hyper crystal, we can get perfect absorption at different wavenumbers and incidence angles by varying the Fermi energy level of graphene sheets via electrostatic biasing. We show that the perfect absorption can be realized at different Fermi energies for TM waves.
在本文中，我们从理论上证明了通过使用石墨烯 - 六方氮化硼（hBN）超晶可以实现并控制红外频率下的完美吸收。hBN是最新的天然双曲线材料，可被视为与石墨烯形成超晶的优良基底。尽管由于其高光光学各向异性，hBN晶体的半空间可实现完美吸收，但完美吸收仅能在特定的固定波数和入射角下出现。通过引入石墨烯 - hBN超晶，我们可以通过静电偏置改变石墨烯片的费米能级，从而在不同的波数和入射角下实现完美吸收。我们表明，对于横磁（TM）波，在不同的费米能量下均可实现完美吸收。
