I am simulating the SHG enhancement of a SiO2 coated nanorod on a single layer WS2. The WS2 is supposed to emit the second harmonic light at 610 nm (excited at 1220nm), which has a Chi2 value = 1.15e-9.
In the 2D simulation, the coated nanorod with length = 210nm was found to has a resonance near 1220nm in the linear simulation(judge by the max. electric field enhancement).
It later on obtain a desired SHG enhancement in the nonlinear simulations.
(NR+WS2 File: https://drive.google.com/open?id=0BwOVBCgZZCivX2k5cm9ERU1RdkU)
(WS2 File: https://drive.google.com/open?id=0BwOVBCgZZCivc0plY1dGY0pGRDQ)
Scrpit of integrating the poynting vectors:2d.lsf (315 Bytes)
In the 3D simulation, the coated nanorod with length = 89nm was found to has a resonance near 1220 nm in the linear simulation.
However, the nonlinear simulations shows there is no enhancement at all comparing to the SHG from the pristine WS2. The results are quite nonsense. It should have certain enhancement when the field enhacement at the fundamental wavelength is large.
(NR+WS2 File: https://drive.google.com/open?id=0BwOVBCgZZCivdFV4QkI4WGxKYlk)
(WS2 File: https://drive.google.com/open?id=0BwOVBCgZZCiveWtFbXV1aVdMVFU)
Scrpit of integrating the poynting vectors:3d.lsf (348 Bytes)
Can anyone please help me to check whether any of these file goes wrong? (especially the advanced setting under FDTD, I’am not sure whether I set it correctly.)
Thanks for any kind of help!