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Start of funding 01.07.2001
Associative optical memories made from photorefractive polymers
Prof. Dr. Klaus Meerholz
Ludwig-Maximilians-University of Munich
Faculty for chemistry and pharmacy
Prof. Dr. Demitri Psaltis
California Institute of Technology, Pasadena (CALTECH)
Department of Optical Engineering
In collaboration with the group of Prof. Demitri Psaltis (Caltech), we have recently demonstrated the storage of up to 30 holograms in one volume element of a photorefractive (PR) polymer by "peristrophic multiplexing". Even though this work was successful, some important technical issues surfaced, which prevent the immediate use of this highly promising system. Most importantly, this concerns the unfortunate ratio between recording (too slow) and erasure dynamics (too fast), which basically limits the number of holograms to be recorded. Also, the temporal "window" which allows for the most accurate cross-correlation (the point in time when all holograms have close to equal strength) was found to be rather narrow. The team of Dr. Klaus Meerholz at the Ludwig-Maximilian University (Munich) has now developed the next generation of PR polymers with improved properties. Within the framework of this project holographic multiplexing experiments shall be performed with these new materials in order to realize reconfigurable "associative memories".