Abstract

Recording of multiplexed microholographic gratings with improved recording volume for high density optical data storage is proposed and demonstrated. By using a hybrid diffractive–refractive objective lens with extended depth of focus, we have achieved a recording beam size of approximately 1μm and a focal depth of 20μm. Multiple gratings corresponding to spectral lines within the 400650nm spectral band have been successfully multiplexed in a single recording spot or pit of size 1.25μm on a DuPont photopolymer film using a white light source along with narrowband filters or dispersion elements, thus demonstrating the storage of multiple bits in a single pit. Simultaneous readout of multiple bits in a single storage pit is accomplished with a microspectrometer-type readout head using a white light source.

© 2006 Optical Society of America

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