Step Action
1 Open the OptiFDTD 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: er=8.9

Refractive index (Re:): 2.983287

6 Click Store.

Defining the channel profile

Step Action
1 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: Profile_PhC

2D profile definition

Material: er=8.9

3D profile definition

Layer name: layer_01

Width:  1.0

Thickness: 1.0

Offset: 0.0

Material: er=8.9

3 Click Add.
4 Click Store.
5 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_PhC

Wafer Dimensions

Length [μm]: 10.0

Width [μm]: 10.0

2D Wafer Properties

Material: Air

3D Wafer Properties

Cladding

Thickness [μm]: 1.0

Material: Air

Substrate

Thickness [μm]: 1.0

Material: Air

2 Click OK.

The Initial Properties dialog box closes.

Creating the PBG crystal structure

Step Action
1 From the Draw menu, select PBG Crystal Structure.
2 Click in the layout window to create the PBG area.

The PBG Crystal Structure appears in the layout window.

3 Click on the Select tool.
4 To set the PBG properties, double-click on the PBG Crystal Structure in the layout.

The Crystal Lattice Properties dialog box appears (see Figure 27).

FDTD - Figure 27 Crystal Lattice Properties dialog box

Figure 27: Crystal Lattice Properties dialog box

5 In Origin, Offset, type/select the following:

Horizontal: 3.0

Vertical: -3.0

6 Click Evaluate.
7 Type/select the following:

Depth: 0.0

Azimuth [deg]: 0.0

8 In Lattice Properties, select Type: 2D Rectangular.
9 In Lattice Dimensions, type/select the following:

Scale: 1.0

#A: 6

#C: 6

10 In Label, type PBGCrystalStruct1.

Note: Do NOT close the Crystal Lattice Properties dialog box.

Setting the atom properties

To set the atom properties, perform the following procedure in the Crystal Lattice Properties dialog box.

Step Action
1 In Atom Waveguide in Unit Cell, Add New, select Elliptic Waveguide from the drop-down menu and click New.

The Elliptic Waveguide Properties dialog box appears.

2 In Center, Offset, type/select the following:

Horizontal: 0.0

Vertical: 0.0

3 Type/select the following:

Major radius: 0.2

Minor radius: 0.2

Orientation Angle: 0.0

Channel Thickness Tapering: Use Default (Channel: None)

Depth: 0.0

Label: Atom

Profile: Profile_PhC.

4 Click OK.

The Elliptic Waveguide Properties dialog box closes.

Note: When you return to the Crystal Lattice Properties dialog box, you will see the defined elliptic waveguide listed in Atom Waveguide in Unit Cell (see Figure 29).

5 Click OK in the Crystal Lattic Properties dialog box.

FDTD - Figure 28 Defined elliptic waveguide in Unit Cell Edit table

Figure 28: Defined elliptic waveguide in Unit Cell Edit table

FDTD - Figure 29 Defined PhC structure in layout

Figure 29: Defined PhC structure in layout