Hello Sooyeon,
1. I don’t believe there are any biomaterials in the Default Material Database. A list of all materials can be found on the following page:
https://optics.ansys.com/hc/en-us/articles/360034394614-Material-Database-in-FDTD-and-MODE
2. Yes, it is possible to add new materials to the databse. The following video will provide you more information on how to add different types of materials:
If you add Sampled Data to the Material Database, it is important to ensure that the material fits are accurate before you run the simulation. The material fitting can be checked and modified in the Material Explorer window. For more information related to material fitting, please refer to the link below:
https://optics.ansys.com/hc/en-us/articles/360034915033-Using-the-Material-Explorer-to-view-and-adjust-optical-material-models
Thank you.