Abstract
We present the design and fabrication of holographic diffus- ers for diffuse IR wireless home networking. Three optimization methods—error reduction, input-output, and simulated annealing—are studied and used to calculate the computer-generated holograms, which are employed to fabricate the holographic diffusers. To evaluate the per- formance of the computer-generated holograms generated using these techniques, a cost function is defined and calculated for each hologram. The computer-generated hologram generated from the simulated an- nealing is found to have the best output compared to the other two tech- niques. The diffusers are verified by displaying them onto a spatial light modulator. The fabrication of the computer-generated hologram onto a piece of quartz with a pixel size of 14314 mm using a laser writing sys- tem is achieved, and the diffraction pattern of the diffuser is demonstrated. © 2003 Society of Photo-Optical Instrumentation Engineers.
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