Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session YO06: Short-pulse Laser-plasma Interactions/Nonlinear Optics of Plasma
9:30 AM–12:18 PM,
Friday, October 21, 2022
Room: Ballroom 111 C
Chair: David Stark, LANL
Abstract: YO06.00011 : Particle Simulation of Resonant Silicon Nanoantennas*
11:30 AM–11:42 AM
Presenter:
Simin Zhang
(Ohio State University)
Authors:
Simin Zhang
(Ohio State University)
Joseph R Smith
(Marietta College)
Enam Chowdhury
(The Ohio State University)
The plasmonic gold nanorods have been modeled with the particle-in-cell (PIC) simulation, from which the relationship between the microscopic electron kinetics and the plasmon oscillation is revealed. However, PIC simulations in non-metal metasurfaces are more challenging due to photoionization processes. Particularly, to avoid the complicated calculations in Keldysh photoionization theory, the EPOCH (Extendable PIC Open Collaboration) code applies simpler models (i.e., multiphoton and tunneling) in different intensity regimes. Nevertheless, such treatment can lead to considerable error in the transition regime between the two types of ionization. Here, we reduced the computation time significantly and makes high-resolution PIC simulations viable for metasurfaces in the mid-Infrared range. We modeled the electron dynamics in rectangular Si nanoantennas with 200-fs incident laser pulses (peak intensity = 6 - 600 GW/cm2) at λ = 3.6 μm.
*This work was supported by Air Force Office of Scientific Research (AFOSR), USA under grant no. FA9550-20-1-0278.
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