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Design and fabrication of holographic diffuser for diffuse infrared wireless home networking

This paper reports the design and fabrication of holographic diffusers for diffuse infrared wireless home networking. Three optimization methods -- error reduction, input-output and simulated annealing, are employed to calculate the computer- generated holograms (CGHs), which are used to fabricate the holographic diffusers. To evaluate the performance of the CGHs generated using the different techniques, a cost function is defined and calculated for each hologram. The CGH generated from the simulated annealing is found to have the best output compared to the other two techniques. The diffusers are verified by displaying them onto a spatial light modulator. The fabrication of the CGH onto a piece of quartz with a pixel size of 14 micrometers X 14 micrometers using a laser writing system is also achieved.