A new approach for implementation of associative memory using volume holographic materials

Mohammad Habibi; Ramin Pashaie

doi:10.1117/12.909320

28 February 2012 A new approach for implementation of associative memory using volume holographic materials

Mohammad Habibi, Ramin Pashaie

Proceedings Volume 8255, Physics and Simulation of Optoelectronic Devices XX; 825525 (2012) https://doi.org/10.1117/12.909320
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

Associative memory, also known as fault tolerant or content-addressable memory, has gained considerable attention in last few decades. This memory possesses important advantages over the more common random access memories since it provides the capability to correct faults and/or partially missing information in a given input pattern. There is general consensus that optical implementation of connectionist models and parallel processors including associative memory has a better record of success compared to their electronic counterparts. In this article, we describe a novel optical implementation of associative memory which not only has the advantage of all optical learning and recalling capabilities, it can also be realized easily. We present a new approach, inspired by tomographic imaging techniques, for holographic implementation of associative memories. In this approach, a volume holographic material is sandwiched within a matrix of inputs (optical point sources) and outputs (photodetectors). The memory capacity is realized by the spatial modulation of refractive index of the holographic material. Constructing the spatial distribution of the refractive index from an array of known inputs and outputs is formulated as an inverse problem consisting a set of linear integral equations.

Citation Download Citation

Mohammad Habibi and Ramin Pashaie "A new approach for implementation of associative memory using volume holographic materials", Proc. SPIE 8255, Physics and Simulation of Optoelectronic Devices XX, 825525 (28 February 2012); https://doi.org/10.1117/12.909320

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KEYWORDS

Content addressable memory

Holographic materials

Inverse optics

Refractive index

Modulation

Electroluminescent displays

Inverse problems

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