Accession Number : ADA294766

Title :   DLMS-Based Optical Memories.

Descriptive Note : Final technical rept. Jun 93-Oct 94,

Corporate Author : HUGHES RESEARCH LABS MALIBU CA

Personal Author(s) : Wu, C. S. ; Dalton, L. R. ; Efron, U.

PDF Url : ADA294766

Report Date : MAR 1995

Pagination or Media Count : 48

Abstract : The objective of this program is to prove the feasibility of room-temperature, erasable DLMS-based optical memories. To achieve the room-temperature spectral hole burning using the dye-labeled polymer microspheres, several materials issues (high-precision polymer microsphere distributions, photo-reversible photochromic dyes, and dye-microsphere coupling) have been addressed. Over 30 azobenzene dyes have been synthesized to meet the criteria for erasable persistent spectral hole-burning. Among them, aminosilfoneazobenzenes shows reasonable kinetics for photo-induced conformational changes. Technology advances in polymer-microspheres give us excellent control over average microsphere size, the dispersion of microsphere sizes in a preparation, and the properties of microsphere composites. Two chemical schemes have been developed to properly label the high-precision microsphere distribution with the bi-stable chromophores. During the program period, we successfully demonstrated the room-temperature Write/Erase/Read operations in the frequency domain. Multiple spectral holes were burned into the sample and successfully retrieved. The erasure of the stored spectral information was also achieved by a pure optical activation. Furthermore, we demonstrated the capability of rewriting new spectral information onto the erased sample. (MM)

Descriptors :   *CHROMOPHORES, *POLYMERS, *READ WRITE MEMORIES, *MEMORY DEVICES, *OPTICAL STORAGE, *OPTICAL PROCESSING, OPTICAL PROPERTIES, COMPOSITE MATERIALS, HOLES(ELECTRON DEFICIENCIES), LASER BEAMS, ROOM TEMPERATURE, SPECTRA, PRECISION, FREQUENCY DOMAIN, MULTISPECTRAL, MICROSPHERES.

Subject Categories : Electrooptical and Optoelectronic Devices
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE