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The 3D two-photon memory was found to be well suited for very large databases with low write requirements because of its potential capacity. raw bandwidth and random access capability. It was determined that performance can be significantly improved by utilizing and accessing feature termed bi-orthogonal access. a feature which allows both record and field parallel access to be supported simultaneously A metric termed bit retrieval efficiency was devised to evaluate the optimality of relational database operations performed with a bi-orthogonally accessed 3D optical memory. The results of this analysis I indicate that the throughput and the random access capability of a memory both affect the performance of relational database machines. A shortcoming that all massively parallel access optical memories have. in terms of this applications is that an entire page of records has to be retrieved even if only one record is desired. From this point they appear to have reduced random access capabilities. We have focused on the theoretical feasibility of obtaining 2-D photonic bandgap from a two-dimensional honeycomb dielectric lattice structure. with a particular emphasis on the effect of having a finite rod length. We have also started investigating the impact of the inclusion of active device structures (e.g.. VCSELs) into the photonic crystals.