Videos > RCWA vs. FDTD: Simulating Periodic Silicon Waveguides
Aug 2, 2023

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RCWA vs. FDTD: Simulating Periodic Silicon Waveguides

Hello, this is Majid from Ozen Engineering, Inc. In this video, I will compare the results of RCWA and FDTD simulations for a periodic silicon waveguide structure.

Structure Overview

  • Substrate Material: SiO2
  • Waveguide Material: Silicon
  • Periodicity: x-direction

FDTD Simulation Setup

  1. Add FDTD Solver:
    • Direction: x is periodic, y is PML (Perfectly Matched Layer)
    • 2D Simulation
  2. Insert Source:
    • Type: Plane wave
    • Wave Type: Block periodic
    • Injection Direction: y-direction (backward)
    • Frequency Range: 1.1 to 1.9
  3. Set Monitors:
    • Monitor Types: Transmission (T) and Reflection (R)
    • Geometry: 2D Y-normal
  4. Visualize Results:
    • Blue: Reflection
    • Green: Transmission

RCWA Simulation Setup

  1. Add RCWA Solver:
    • Geometry: x-band 0.75
    • Propagation Axis: Y
    • Interface Reference: Silicon boundaries
  2. Set K Vector Domain:
    • Type: Rectangular
    • Points: 51
  3. Set Excitation:
    • Frequency Range: 1.1 to 1.9
    • Points: 101
  4. Visualize Results:
    • Interest: Ts and Rs
    • Color: Tp as green, change to black

Conclusion

The results for both RCWA and FDTD simulations are almost the same. Thank you for watching!

[This was auto-generated. There may be mispellings.]

Hi, I'm Majid from Ozen Engineering. I will compare the results of RCWA and FDTD simulations for a periodic silicon waveguide structure. The structure's substrate is SiO2, and the waveguide is also silicon, periodic in the x direction.

For the FDTD simulation, the solver is added, with a 2D simulation region. The y direction has PML (Perfectly Matched Layer) boundary conditions, and the x direction is periodic.

The source is a plain wave, injected from the y direction, with a frequency range of 1.1 to 1. 9. Monitors are set up for transmission (T) and reflection (R) in the 2D Y normal direction. Now, I will add the RCWA simulation.

The RCWA settings match the FDTD geometry, with a propagation axis of Y and an interface reference position for silicon.

The k-vector domain is set to rectangular, with 51 points for the material excitation in the frequency range of 1.1 to 1. 9. After running the RCWA simulation, the total energy is visualized, showing Tp (Transverse Electric) and Ts (Transverse Magnetic) polarization results.

I removed the P polarization, focusing on Ts and Rs. The results from both RCWA and FDTD are compared, showing a close match. Thank you.

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