Numerical simulations
This protocol is extracted from research article:
Nano-kirigami with giant optical chirality
Sci Adv, Jul 6, 2018; DOI: 10.1126/sciadv.aat4436

The transmission spectra and electromagnetic field distributions of the 2D and 3D gold structures were simulated by using the finite element method. The current distributions were obtained by using a current density monitor in commercial software package CST Microwave Studio based on the finite integration method. Periodic boundary conditions along the x- and y-axis direction were applied to the unit cell of the simulated structures. Incident plane wave was incident along the z-axis direction, which was identical to the conditions in experiments. The refractive index and extinction coefficient of gold were described by the Lorentz-Drude model. The thickness of the target nanostructures after nano-kirigami transformation was set to 50 nm in simulations unless otherwise specified, which was under the consideration of the sputtering effect during the global ion beam irradiation and confirmed in SEM characterizations. The deformed configurations of 3D nano-kirigami architectures were calculated with finite element software SIMULIA Abaqus FEA and COMSOL Multiphysics. User-defined subroutines were implemented for applying the nonuniform residual stress field to trigger global buckling of nanofilms. More details related to modeling can be found in sections S1 and S2.

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