Holographic memory formed by three laser sources with different wavelengths for application to optical reconfiguration

Abstract

An optical setup using three laser sources with different wavelengths was proposed for the formation of a holographic memory consisting of volumetric periodic structures using liquid–crystal composites. Structural analysis of the holographic gratings formed at different wavelengths was performed using polarizing optical microscopy and scanning electron microscopy. The periodic interval between the interference fringes and the volumetric periodic structures decreased with a decrease in the wavelength of the laser used in the fabrication process. The fabricated holographic memory can be used to record and reconstruct circuit information in optically reconfigurable gate arrays (ORGAs) by applying parallel processing techniques based on spatial light wiring. The development of interference exposure optical systems for various laser wavelengths, including blue lasers with short wavelengths, is extremely important for improving the capacity of holographic memory by miniaturizing its internal lattice structure. The fabricated holographic memory demonstrated the ability to accurately record and reconstruct circuit information patterns by switching between different laser wavelengths. Establishing a holographic memory system for ORGAs is essential for developing radiation-resistant devices that can be used in fields requiring high reliability.