Directional thermal emission control by coupling between guided mode resonances and tunable plasmons in multilayered graphene
Directional thermal emission control by coupling between guided mode resonances and tunable plasmons in multilayered graphene
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DOI：
10.1063/1.4966577
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发表时间：
2016-10
影响因子：
3.2
通讯作者：
Kota Ito;H. Iizuka
中科院分区：
文献类型：
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作者：
Kota Ito;H. Iizuka
定向热辐射因其在热管理系统和中红外光源中的适用性而引起人们的兴趣。单层石墨烯中的等离子体激元可以通过化学势进行调谐，而等离子体激元色散的横向波数太大，不利于定向耦合到远场。在本文中，我们利用多层石墨烯中的可调谐等离子体来实现定向热辐射。等离子体激元的横向波数随着石墨烯层数的增加而减小，并对这种减小进行了解析解释。热激发的石墨烯等离激元通过逝去波与硅栅中的导模共振耦合，实现角度选择性远场发射。我们发展了一种模式分析，以研究耦合条件。此外，还可以通过改变石墨烯的化学势来调节包括非对称热辐射在内的定向热辐射。计算出的发射率。
Directional thermal radiation is attracting interest because of its applicability to thermal management systems and mid-infrared light sources. Plasmons in a single graphene layer are tunable by the chemical potential, while the lateral wavenumber of the plasmon dispersion is too large for the directional coupling to the far field. In this paper, we achieve directional thermal radiation by utilizing tunable plasmons in multilayered graphene. The lateral wavenumber of the plasmon is shown to be reduced as the number of graphene layers increases, and the reduction is analytically explained. The thermally excited graphene plasmon couples to the guided mode resonance in a silicon grating through evanescent waves so as to realize angular-selective far-field emission. We develop a modal analysis in order to investigate the coupling condition. In addition, the directional thermal emission including asymmetric one can be tuned by varying the chemical potential of graphene layers. The calculated emissivity obtaine...