Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces...
Transcript of Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces...
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ConvergencetestFDTDband-structuresimulationonscatteringloss
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STEP1:• FastsweepKx tofind thevalue at f=1.935x1014 Hz (1550 nm), which
is 0.375 for a regular WG in the TE mode• ObtainthegroupvelocityatK=0.375(vg/c=0.235)
FDTDBandstructuresimulationonscatteringloss
220 x 500 regular waveguide with sidewallroughness of Lc = 50 nm, σ = 1 nm in theTE mode (oxide cladding).
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Meshaccuracysweep:1– 8YandZspan10um,Xspan0.24um,nomeshoverride,simulation time3000,PMLlayer16
Simulationtimesweep:300– 30000fsYandZspan10um,Xspan0.24um,nomeshoverride,meshaccuracy2,PMLlayer16
PML-distancesweep:YandZspan1– 16umXspan0.24um,Meshaccuracy2,nomeshoverride,simulation time3000,PMLlayer16
Zspan
PML-layersweep:Layernumber 2,4,8,16,32,64YandZspan10um,Xspan0.24um,Meshaccuracy2,nomeshoverride, simulation time3000
STEP2:
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Xspansweep:X span50 – 250 nmYandZspan10um,Meshaccuracy2,nomeshoverride,simulation time10000 fs,PMLlayer16
Meshoverride:dy 1– 10nm(dx20nm,dz 20nm)YandZspan10um,Meshaccuracy2,simulation time10000 fs,PMLlayer16
X span
Mesh override
Sweep parameters:PML distance 10 nm in Y and Z axisMesh accuracy 2Simulation time 10000 fsX span 200 nmMesh override 2 nm in dy direction