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# Lesson 12: Scan the Refractive Index (RI)

## Introduction

This lesson describes how to modify the refractive index of a waveguide by using the script. The script runs the simulation four times. The refractive index of the waveguide in the first iteration has the StartValue of 1.47. It is increased in later simulations to 1.48, 1.49, and 1.50. The procedures are: •     Defining the materials and…

## Defining Materials & Channel

To define the materials and the channel, perform the following procedure. Step Action 1 From the File menu, select New.The Initial Properties dialog box appears. 2 Click Profiles And Materials. The Profile Designer opens and displays the Options dialog box. –    Change the Master library path if required, and then click OK to close the…

## Defining Layout Settings

To define the layout settings, perform the following procedure. Step Action 1 In the Initial Properties dialog box, click the Waveguide Properties tab. 2 Type the following value: Width (um): 4.0 3 In the Profile list, click ChannelPro1 (see Figure 4). Figure 4: Waveguide Properties tab 4 Click the Wafer Dimensions tab. 5 Type the…

## Drawing Linear Waveguide

To draw the Linear Waveguide, perform the following procedure. Step Action 1 From the Draw menu, select Linear Waveguide. 2 Draw the waveguide in the center of the wafer and covering the length of the wafer (see Figure 8). Figure 8: Draw Linear Waveguide Inserting the Input Plane To insert the Input Plane, perform the following…

## Creating the Script

To create the script, perform the following procedure. Step Action 1 Click the Scripting tab and type the following script: ‘ Change the 2D refractive index StartValue = 1.47 EndValue = 1.5 ‘ RIofWaveguide is the name representing the material ‘ to be manipulated. It can be any other name. Dim RIofWaveguide ‘ Here, “Guide”…

## Running the Simulation

To run the simulation, perform the following procedure. Step Action 1 Save the project as a *.bpd file. 2 From the Simulation menu, select Calculate 2D Isotropic Simulation.The Simulation Parameters dialog box appears. 3 To start the simulation, click Run.A message box appears and prompts you to save the project and run the simulation. 4 Click…

## Viewing Results in the BPM Analyzer

To view the simulation results in OptiBPM_Analyzer, perform the following procedure. Step Action 1 In the OptiBPM_Analyzer project directory, double-click Optical Field Propagation and Refractive Index Propagation. 2 Under Refractive Index Propagation , click XZ Slice. The graph appears in the main layout (see Figure 14). Figure 14: Refractive Propagation Index—XZ Slice 3 In the Iteration…