Unified Platform for Seamless Interoperability
Two primary foundations exist for the simulation of multiscale systems: employing diverse simulation models and integrating these models in a three-dimensional system framework. The second technical pillar requires that every simulation model must be interoperable. This means they need to use the same representation of light, similar to how people in a group use a shared language for communication.

Simulating Across Scales Needs Light Represented by Electromagnetic Fields
To ensure interoperability across various simulation models, it is essential to employ the most advanced level of light representation: an electromagnetic field representation. This implies that it is essential for all simulation models to be developed with respect to electromagnetic fields. While this is the standard form of light representation for rigorous models such as FMM, other models may require enhancement to effectively support multiscale simulation. This is particularly pertinent to geometricoptical models, which need to be expanded to accommodate electromagnetic fields.
Field Tracing Connects All Simulation Models in a System
We arrive at the underlying principle for achieving multiscale system simulation:
electromagnetic fields are traced through multiple components, each with its distinct simulation model, in a three-dimensional and non-sequential fashion. This concept is also referred to as field tracing. Its foundation is rooted in physical optics.

VirtualLab Fusion unifies simulation models on a single platform, eliminating the hassle of data interfaces across various software products.

VirtualLab Fusion Enables Multiscale Optical Simulation
In summary, multiscale optical system simulation requires a software platform that offers a diverse collection of simulation models utilizing electromagnetic fields, along with the capability to integrate these models within a three-dimensional system setup. VirtualLab Fusion software serves as this type of platform, facilitating multiscale optical simulation and design.