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Diffraction Patterns

Application ID: 117


This example resembles the well-known 2-slit interference experiment often demonstrated in schools with water waves or sound. This model mimics the plane-wave excitation with two thin waveguides leading to slits in a screen, and it computes the diffraction pattern on the screen’s other side.

This diffraction pattern is clearly visible. The main effect of quantization is that the numerical wavelength differs from lambda and thus results in a systematic shift in the angles. You could correct for this effect by adjusting the value of k, in the Helmholtz equation, to the element size. Such practices are important when you wish to faithfully model interference effects of monochromatic waves.

This model is included as an example in the following products:

COMSOL Multiphysics®

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 Descrição dos Produtos 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.