Creating a layout

Step Action
1 Open the Waveguide Layout Designer.
2 To create a new project, select File > New.

The Initial Properties dialog box appears.

3 Click Profiles and Materials.

The Profile Designer window appears.

4 Under the Materials folder, right-click the Dielectric folder and select New.

A new Dielectric material dialog box appears.

5 Type the following information: Name: N=2

Refractive index (Re:): 2.0

6 To save the material, click Store.

N=2 appears in the Dielectric folder in the directory and in the dialog box title bar.

Defining the channel profile

Step Action1
Under the Profiles folder, right-click the Channel folder and select New.

The ChannelPro1 dialog box appears.

2 Create the following channel profile: Profile name:


2D profile definition

Material: N=2

3D profile definition

Layer name: layer_01

Width:  1.0

Thickness: 1.0

Offset: 0.0

Material: N=2

Click Add.

3 Click Store.
4 Close the Profile Designer.

Defining wafer and waveguide properties

Step Action
1 In the Initial Properties dialog box, type/select the following:

Waveguide Properties

Width [μm]: 1.0

Profile: Profile_n=2

Wafer Dimensions

Length [μm]: 8.0

Width [μm]: 4.0

2D Wafer Properties

Material: Air

3D Wafer Properties


Thickness [μm]: 2.0

Material: Air


Thickness [μm]: 2.0

Material: Air

2 Click OK.

The Initial Properties dialog box closes.

Inserting the input plane

To insert the input plane, perform the following procedure.

Step Action
1 From the Draw menu, select Vertical Input Plane.
2 To insert the input plane, click in the layout window where you want it placed.

The input plane appears in the layout.

3 To edit the input plane, double-click on the input plane in the layout.

The Input Plane Properties dialog box appears.

4 On the General tab, type/select the following:

Continuous Wave

Wavelength [μm]: 1.55

Input Field Transverse: Rectangular

Plane Geometry:

Z Position [μm]: 1.0

5 On the 2D Transverse tab, type/select the following:

Center Position [μm]: 0.0

Halfwidth [μm]: 5.0

Tilting Angle [deg]: 0

Effective Refractive Index: Local

Amplitude [V/m]: 1.0

6 Click OK.

The Input Field Properties dialog box closes.

Setting the 2D TE FDTD simulation parameters

Step Action
1 From the Simulation menu, select 2D Simulation Parameters.

The Simulation Parameters dialog box appears.

2 Type/select the following information:

Polarization: TE

Mesh Delta X [μm]: 0.05

Mesh Delta Z [μm]: 0.05

3 Click Advanced….

The Boundary Conditions dialog box appears.



-Z: Anisotropic PML

+Z: Anisotropic PML

Anisotropic PML Calculation Parameters

Number of Anisotropic PML Layers: 10

Theoretical Reflection Coefficient: 1.0e-12

Real Anisotropic PML Tensor Parameters: 5.0

Power of Grading Polynomial: 3.5

4 Click OK.

The Boundary Conditions dialog box closes.

5 In Time Parameters, click Calculate.

The default time step size is calculated.

6 Select Run for 1000 Time Steps (Results Finalized).
7 Select Key Input Information: Input Plane1 and wavelength:1.55.
8 Click OK to close the Simulation Parameters dialog box without running the simulation, or click Run to start the OptiFDTD Simulator.

Running the 2D TE plane wave simulation

When you start the simulation, the plane wave propagation can be observed
(see Figure 25).

FDTD - Figure 25 OptiFDTD Simulator

Figure 25: OptiFDTD Simulator