Electromagnetic local density of states in graphene-covered hyperbolic metamaterial
Electromagnetic local density of states in graphene-covered hyperbolic metamaterial
复制标题
石墨烯覆盖的双曲超材料中的电磁局域密度
DOI：
10.1140/epjb/e2017-80407-x
复制
发表时间：
2017
影响因子：
1.6
通讯作者：
Liu Nian Hua
中科院分区：
文献类型：
--
作者：
Song Chen Cai;Wang Tong Biao;Liao Qing Hua;Yu Tian Bao;Liu Nian Hua
从理论上研究了由周期性碳化硅（SiC）纳米线阵列组成的石墨烯覆盖的双曲超材料表面附近的电磁局域密度（EM-LDOS）。除了分别来自石墨烯等离子体激元和石墨烯等离子体激元与表面声子极化子（SPhPs）耦合的两个普通峰之外，EM-LDOS 谱中还出现了一个由双曲模式（HM）贡献的新峰。当 SiC 在整个结构上的填充体积增加时，HM 峰变窄，幅度减小。与其他两个峰相比，HM峰对石墨烯的化学势不敏感。此外，还研究了距离对EM-LDOS的影响，在较小距离下，石墨烯等离子体和HM对EM-LDOS都起重要作用，而在较大距离下，SPhPs占主导地位。
The electromagnetic local density of states (EM-LDOS) near the surface of a graphene-covered hyperbolic metamaterial consisting of a periodical array of silicon carbide (SiC) nanowires is investigated theoretically. A new peak from the contribution of the hyperbolic mode (HM) appears in the EM-LDOS spectrum besides two ordinary peaks which are from graphene plasmon and the coupling of graphene plasmon with surface phonon polaritons (SPhPs), respectively. When the filling volume of SiC over the total structure increases, the HM peak becomes narrow with a decreasing amplitudes. Comparing with the other two peaks, HM peak is not sensitive to the chemical potential of graphene. Furthermore, the effect of distance on EM-LDOS is also studied, both the graphene plasmon and HM play important role to EM-LDOS at smaller distance, while SPhPs dominates at larger distance.