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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 application was built using the following:

COMSOL Multiphysics®

The combination of COMSOL® products required to model your application depends on the physics interfaces that define it. Particular physics interfaces may be common to several products (see the Specification Chart for more details). To determine the right combination of products for your project, you should evaluate all of your needs in light of each product's capabilities, consultation with the COMSOL Sales and Support teams, and the use of an evaluation license.