石墨烯正弦型彩带结构的表面等离基元仿真


#1

我们用户湖南大学王玲玲教授组最近在Optics Express2016年第一期上发表的文章,供大家参考:


结果很漂亮

要得到如此光滑的结构,需要很细的网格,因此仿真时间可能很长。但是,正如我多次建议的,一般用户在初步设计和仿真一个结构时,应该先用粗网格快速测试设置和脚本,得到初步结果,仅当需要发表文章、写报告时才用高精度仿真。当然,从粗网格到细网格,不是仅仅改变网格大小的问题,同时还需要调整仿真区、PML等设置,以保证PML反射可以忽略、仿真收敛等。

Opt Express. 2016 Jan 11;24(1):427-36. doi: 10.1364/OE.24.000427.
Excitation of crest and trough surface plasmon modes in in-plane bended graphene nanoribbons.
Xia SX, Zhai X, Wang LL, Lin Q, Wen SC.
Abstract
To achieve efficiently coupling to external light is still remaining an insurmountable challenge that graphene faces before it can play an irreplaceable role in the plasmonic field. Here, this difficulty is overcome by a scheme capable of exciting graphene surface plasmons (GSPs) in in-plane bended gratings that are formed by elastic vibrations of graphene nanoribbons (GNRs). The gratings enable the light polarized perpendicularly to the GNRs to two kinds of GSP modes, of which the field concentrations are within the grating crest (crest mode, C-M) and trough (trough mode, T-M), respectively. These two kinds of modes will individually cause notches in the transmission spectrum and permit fast off-on switching and tuning of their excitation dynamically (elastic vibration, Fermi energy) and geometrically (ribbon width). The performance of this device is analyzed by finite-difference time-domain simulations, which demonstrates a good agreement with the quasi-static analysis theory. The proposed concept expands our understanding of plasmons in GNRs and offers a platform for realizing of 2D graphene plasmonic devices with broadband operations and multichannel modulations.


dipole source无法激励石墨烯SPP模
请问fdtd可以用倏逝波作为光源进行仿真吗?是需要自己写脚本吗?有没有参考资料?