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FDTD Simulation of a Half Convex Lens (Animation)

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Uploaded on Feb 26, 2011

Finite-difference time-domain (FDTD) simulation of a half convex lens (plano-convex / positive) when a point source is located at its focal plane in both on-axis (left) and off-axis (right) cases. The points indicated by the small circle are the actual source locations and the third point with the cross sign is the location of symmetry for the off-axis source.

The source locations are located at the focal plane to demonstrate the collimation property of the lenses. Again, to demonstrate the frequency independency of the lens behavior, two short pulses at different central frequencies are fired consecutively and both cases show collimation after exiting the lens.

The lens employed here has a parabolic surface and obviously, it is not perfectly optimized hence the directed signals are not perfectly smooth. For desired far field performance the shape of the lens can be further designed using optimization algorithms integrated with electromagnetic solvers (A sample one can be watched here: http://www.youtube.com/watch?v=KCAwWo...)

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