np Density and Temperature Index Perturbation - Simulation object

np density grid attribute

To export np density data, the simulation file should contain an unstructured data set called ‘charge’ with scalar attributes ‘n’ and ‘p’. This would typically be exported from CHARGE as shown in the Mach Zehnder example. This can be done by right-clicking the charge monitor and selecting the save data with a user-specified filename.

Temperature grid attribute

The temperature grid attribute data can be exported from HEAT using scripts.

Once a simulation has run, click on the 'HEAT' solver object in the object tree. This will bring up the results related to the thermal analysis. The dataset called 'thermal' is the one to be export. The script as shown below can be used to do that:

out = getresult("HEAT","thermal");
matlabsave("filename.mat",out);

Import using GUI

1. Add grid attribute object from the attribute menu
2. Right-click the grid attribute object in the object tree
3. Click the import data button and specify the filename

Import using script

It is also possible to import the np density and temperature grid attributes using scripts. Please refer to importdataset for further information.

1. Click 'Material' button from the main menu

2. Click 'Add' and select 'index perturbation' material model

3. Specify the material name

4. In the material properties, select the type(s) of index perturbation to be included in the material model, ie. np density and temperature. You can include only one of them or both. The index of the base material is then perturbed in accordance with options you choose for the conversion of np density / temperature to index changes.

There are three conversion options available for np Density grid attribute:

• Drude
• Soref and Bennett
• Custom

and two options for Temperature grid attribute:

• linear sensitivity
• table of values

For more information about models for np Density material, please visit Charge to index conversion.