Patent ID: 7608384
Filing Date: 2009-10-27
Classification: B82Y,G02F,G11C,Y10S

Abstract:
1. A method of writing data in a 3-bit, 0-1-2 ternary encoding scheme for WORM (Write Once Read Many Times) optical data storage on a compact disc (CD) or digital video disc (DVD) with two-photon fluorescent readout consisting essentially of the steps of: (h) providing a data storage medium which is at least one of a compact disc (CD) and a digital video disc (DVD) composed of a transparent polymer selected from at least one of polystyrene, polymethylmethacrylate (PMMA) and polycarbonate, impregnated with a photo-acid generator and a stable reactive fluorene dye; (i) focusing a near infrared tunable Ti:Sapphire laser beam into the data storage medium with high intensity short pulses of 730 nm wavelength laser light causing the photo-acid generator to absorb the high intensity short pulses, undergo two-photon absorption and generate a proton ion (H (j) forming a stable balanced ion pair with the negative counter-ion from the photo-acid generator and the positive ion of the reactive fluorene dye wherein the stable ion pair forms a data storage voxel (volume pixel) encoding data in a 0-1-2 ternary (3-bit) data encoding scheme to achieve high data storage densities in the data storage medium.