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9 September 2002 Diffuse hologram for indoor infrared wireless communication
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Proceedings Volume 4910, Optical Networking II; (2002)
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China
A diffuse hologram was designed, fabricated and tested. The application of this hologram is to create a uniform light distribution environment so that shadowing problem encountered in infrared-red communication could be overcome. Our hologram is a binary-phase level with an array of pixel of 256 x 256 and was computer generated. The hologram was fabricated using both the direct laser writer and electron beam writer technique, and followed by reactive ion etching on quartz substrate. The feature size of the holograms is ~11 mm and ~2 mm for the direct laser writer and e-beam lithography respectively. To evaluate the hologram, it was reconstructed in a dark room of size 4.6m x 3.6m x 2.61m and light distribution across the room was measured.
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George C. K. Chen, Jianping Yao, Wong Ee Yin, and Koh Siew Ying "Diffuse hologram for indoor infrared wireless communication", Proc. SPIE 4910, Optical Networking II, (9 September 2002);

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