Structural Color Filter (Surrogate Model Demo)
Application ID: 127291
This model of a simple electromagnetics application, a structural color filter, demonstrates using a surrogate model to solve both the forward and inverse problem.
The structural color filter consists of a metal-dielectric-metal interface that functions like a Fabry-Perot cavity with resonant peaks in its transmission spectrum. Depending on the thicknesses of each layer, different resonant frequencies and bandwidths can be attained - thus appearing as different colors in the visible spectrum. The model calculates color space coordinates LAB (and RGB, XYZ) based on input thicknesses d1, d2, and d3 and the surrogate model is trained to do the same.
Finally, an optimization study is used to solve the inverse problem, determining the appropriate thicknesses to achieve a desired color, using the pre-trained forward surrogate model.
The user can interact with this model using a custom app designed for smartphone layouts.
This model is based on the following academic paper: Dai et al., "Accurate inverse design of Fabry-Perot-cavity-based color filters far beyond sRGB via a bidirectional artificial neural network." Photonics Research 9, no. 5 (2021): B236-B246.
This application example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.