Title :
Opto-ferroelectric memories using vinylidene fluoride and trifluoroethylene copolymers
Author :
Date, M. ; Furukawa, T. ; Yamaguchi, T. ; Kojima, A. ; Shibata, I.
Author_Institution :
Inst. of Phys. & Chem. Res., Saitama, Japan
fDate :
6/1/1989 12:00:00 AM
Abstract :
It is shown how ferroelectric polymers can be applied to an erasable optical memory. The medium developed consists of a dye-doped vinylidene-fluoride-trifluoroethylene copolymer film with a thickness of 2 μm, spin-coated onto an ITO-coated glass plate. Information is written in terms of sequences of positive and negative polarizations generated by irradiating a focused laser beam of ~5-μm diameter, in the presence of sign-controlled electric fields. The data are read out pyroelectrically by scanning the laser beam. A C/N ratio of 48 dB has been obtained for the 0/1 data train, in a 20-μm pitch
Keywords :
ferroelectric devices; optical storage; polymer blends; polymer films; C/N ratio; ITD coated glass plate; dye doped film; erasable optical memory; ferroelectric polymers; focused laser beam; laser beam scanning; negative polarizations; polyvinylidene fluoride trifluoroethylene copolymer film; positive polarization; pyroelectric reading; sign-controlled electric fields; spin coating; Absorption; Electrodes; Ferroelectric materials; Glass; Laser beams; Optical films; Optical polymers; Polarization; Pyroelectricity; Writing;
Journal_Title :
Electrical Insulation, IEEE Transactions on
