You, JW;
Threlfall, E;
Gallagher, DFG;
Panoiu, NC;
(2018)
Computational analysis of dispersive and nonlinear 2D materials by using a GS-FDTD method.
Journal of the Optical Society of America B
, 35
(11)
pp. 2754-2763.
10.1364/JOSAB.35.002754.
Preview |
Text
You_GS_FDTD_Revised.pdf - Accepted Version Download (2MB) | Preview |
Abstract
In this paper, we propose a novel numerical method for modeling nanostructures containing dispersive and nonlinear two-dimensional (2D) materials, by incorporating a nonlinear generalized source (GS) into the finite-difference time-domain (FDTD) method. Starting from the expressions of nonlinear currents characterizing nonlinear processes in 2D materials, such as second- and third-harmonic generation, we prove that the nonlinear response of such nanostructures can be rigorously determined using two linear simulations. In the first simulation, one computes the linear response of the system upon its excitation by a pulsed incoming wave, whereas in the second one the system is excited by a nonlinear GS, which is determined by the linear near-field calculated in the first linear simulation. This new method is particularly suitable for the analysis of dispersive and nonlinear 2D materials, such as graphene and transition-metal dichalcogenides, chiefly because, unlike the case of most alternative approaches, it does not require the thickness of the 2D material. To investigate the accuracy of the proposed GS-FDTD method and illustrate its versatility, the linear and nonlinear responses of graphene gratings have been calculated and compared to results obtained using alternative methods. Importantly, the proposed GS-FDTD can be extended to three-dimensional bulk nonlinearities, rendering it a powerful tool for the design and analysis of more complicated nanodevices.
| Type: | Article |
|---|---|
| Title: | Computational analysis of dispersive and nonlinear 2D materials by using a GS-FDTD method |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1364/JOSAB.35.002754 |
| Publisher version: | https://doi.org/10.1364/JOSAB.35.002754 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10064274 |
Loading...
Loading...Loading...Loading...Archive Staff Only
 |
View Item |
