Creating a layout

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

The Initial Properties dialog box appears.

3Click Profiles and Materials.

The Profile Designer window appears.

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

A new Dielectric material dialog box appears.

5Type the following information: Name: N=2

Refractive index (Re:): 2.0

6To 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

StepAction1
Under the Profiles folder, right-click the Channel folder and select New.

The ChannelPro1 dialog box appears.

2Create the following channel profile: Profile name:

Profile_n=2

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.

3Click Store.
4Close the Profile Designer.

Defining wafer and waveguide properties

StepAction
1In 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

Cladding

Thickness [μm]: 2.0

Material: Air

Substrate

Thickness [μm]: 2.0

Material: Air

2Click OK.

The Initial Properties dialog box closes.

Inserting the input plane

To insert the input plane, perform the following procedure.

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

The input plane appears in the layout.

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

The Input Plane Properties dialog box appears.

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

Continuous Wave

Wavelength [μm]: 1.55

Input Field Transverse: Rectangular

Plane Geometry:

Z Position [μm]: 1.0

5On 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

6Click OK.

The Input Field Properties dialog box closes.

Setting the 2D TE FDTD simulation parameters

StepAction
1From the Simulation menu, select 2D Simulation Parameters.

The Simulation Parameters dialog box appears.

2Type/select the following information:

Polarization: TE

Mesh Delta X [μm]: 0.05

Mesh Delta Z [μm]: 0.05

3Click Advanced….

The Boundary Conditions dialog box appears.

-X: PMC

+X: PMC

-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

4Click OK.

The Boundary Conditions dialog box closes.

5In Time Parameters, click Calculate.

The default time step size is calculated.

6Select Run for 1000 Time Steps (Results Finalized).
7Select Key Input Information: Input Plane1 and wavelength:1.55.
8Click 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