Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces...

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Convergence test FDTD band-structure simulation on scattering loss

Transcript of Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces...

Page 1: Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces Monitors Port Resour ces Check Materials Structures Tree FDTD Layout 12 Attribu tes ts

ConvergencetestFDTDband-structuresimulationonscatteringloss

Page 2: Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces Monitors Port Resour ces Check Materials Structures Tree FDTD Layout 12 Attribu tes ts

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).

Page 3: Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces Monitors Port Resour ces Check Materials Structures Tree FDTD Layout 12 Attribu tes ts

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:

Page 4: Convergence test · bandstructure convergence test. p the PML the p PML s s t Build Sour ces Monitors Port Resour ces Check Materials Structures Tree FDTD Layout 12 Attribu tes ts

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


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