Tunable perfect absorption at infrared frequencies by a graphene-hBN hyper crystal
Tunable perfect absorption at infrared frequencies by a graphene-hBN hyper crystal
复制标题
石墨烯-六方氮化硼超晶体在红外频率下的可调谐完美吸收
DOI：
10.1364/oe.24.017103
复制
发表时间：
2016-07-25
期刊：
影响因子：
3.8
通讯作者：
Wen, Shuangchun
中科院分区：
文献类型：
--
作者：
Wu, Jipeng;Jiang, Leyong;Wen, Shuangchun
在这篇文章中，我们从理论上证明了在红外频率下的完美吸收可以通过使用石墨烯-六方氮化硼（hBN）超晶体来实现和控制。hBN是最新的天然双曲材料，可以被视为与石墨烯形成超晶体的优良基底。虽然由于hBN晶体的高光学各向异性可以实现半空间的完全吸收，但完全吸收只能在一定的波数和入射角下出现。通过引入石墨烯-hBN超晶体，通过静电偏压改变石墨烯片的费米能级，可以在不同的波数和入射角下获得理想的吸收。结果表明，在不同的费米能级下，TM波都可以实现完全吸收。(C)2016美国光学学会
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. (C) 2016 Optical Society of America