A hybrid plasmonic terahertz waveguide with ridge structure base on Bulk-Dirac-semimetal
A hybrid plasmonic terahertz waveguide with ridge structure base on Bulk-Dirac-semimetal
复制标题
基于体狄拉克半金属的脊结构混合等离子体太赫兹波导
DOI：
10.1016/j.optcom.2020.126239
复制
发表时间：
2020-11-15
影响因子：
2.4
通讯作者：
Wang, Jiao
中科院分区：
文献类型：
--
作者：
Jiang, Yannan;Shi, Congcong;Wang, Jiao
提出了一种基于体狄拉克半金属（BDS）的混合等离子体波导（HPW）。通过在传统高功率阱的低折射率间隙中插入双脊（DR）结构，可以有效地限制太赫兹波，从而产生较小的模式面积。基于有限元方法，将所设计的DR HPW与单脊混合等离子体波波导（SR HPW）的结果进行了比较，结果表明所设计的DR HPW具有更好的性能。此外，BDS等离子体激元与金属等离子体激元的特别不同之处在于，传播损耗可以通过调节费米能级来调节。在合理的费米能级下，可以获得超过10倍的品质因数（FoM）的改善。
We propose a hybrid plasmonic waveguide (HPW) base on Bulk-Dirac-semimetal (BDS). By inserting the dual-ridge (DR) structure into the low-index gap of the conventional HPW, the terahertz wave can be confined efficiently and then a small mode area can be brought. Based on the finite element method (FEM), the results of the proposed DR HPW are compared with that of the single-ridge hybrid plasmonic waveguide (SR HPW), which show the advanced performance of the proposed design. Besides, the BDS plasmon particularly differs from plasmon of metal in that the propagation loss can be tuned by adjusting the Fermi energy level. With a reasonable Fermi energy level, over 10 times improvement of the Figure of merit (FoM) can be obtained.