The aim of this project is to create high density optical memories based on mixtures of photoluminescent particles suspended in liquids.  Microfluidic structures are used to control the mixing and delivery of different species of semiconductor nanoparticles with unique spectral signatures.  By varying the concentration of different particle types, spectral codes can be assigned to nanometer sized volumes.  The code stored in a particular volume can be read out by pumping the region with blue light and observing the photoluminescence.  The number of codes available grows exponentially with the number of different species of particles used, allowing memories with much higher bit densities than conventional optical storage.

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