Direct-Splitting-Based CN-FDTD for Modeling 2D Material Nanostructure Problems

IEEE Open Journal of Antennas and Propagation

Qingsheng Zeng¹  William T. Joines²  Yuxian Zhang³  Guo Ping Wang³  Naixing Feng³  Meisong Tong⁴ 

[1] College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, China;Department of Electrical and Computer Engineering, Duke University, Durham, NC, USA;Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, China;Key Laboratory of Embedded System and Service Computing of the Ministry of Education, College of Electronics and Information Engineering, Tongji University, Shanghai, China;

关键词: Black phosphorous (BP);    Crank-Nicolson finite-difference time-domain (CN-FDTD);    complex-frequency-shifted perfectly matched layer (CFS-PML);    direct-splitting (DS);    metasurface;    two-dimensional layered material (2DLM);   

DOI  :  10.1109/OJAP.2020.3006842

来源: DOAJ

【 摘 要 】

Incorporating a truncation of the complex-frequency-shifted perfectly matched layer (CFS-PML), the direct-splitting- based Crank-Nicolson finite-difference time-domain (CNDS-FDTD) is developed and applied to the infrared two-dimensional layered material (2DLM) black phosphorous (BP) metasurface implementations on the all-dielectric nanostructure. To improve extremely low efficiencies in solving infrared terahertz (THz) problems with the few-atomic-layer thickness of 2DLMs, the CFS-CNDS-FDTD is proposed in demand due to the fact that it possesses capabilities of implicit FDTD method and unsplit-field CFS-PML truncation, respectively, in completely conquering the Courant-Friedrich-Levy condition (CFL) limit and holding good performance. The temporal incremental in the CFS-CNDS-FDTD can reach 1000 times larger than that in the regular FDTD for infrared nanoscale problems centered at the 2.5 THz and then keep accurate. Three-dimensional (3D) numerical cases have been carried out to corroborate the proposed method. The CFS-CNDS- FDTD can not only achieve high accuracies and then saves several dozen times of CPU time as compared to the regular FDTD, but also pave the way for designing all-dielectric nanostructures with other 2DLM metasurfaces.

【 授权许可】

Unknown