Three-dimensional optical memory

a three-dimensional optical memory and optical data technology, applied in the field of three-dimensional optical data storage and retrieval system, can solve the problems of inability to use commercially and high maintenance cost of such a memory

Inactive Publication Date: 2007-10-18
MEMPILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The maintenance of such a memory is expensive and cannot be used commercially.

Method used

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Examples

Experimental program
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example 1

[0045] Pure trans-4-bromostilbene diethylacetate was dissolved in acetonitrile and irradiated with a mercury lamp having a Hg filter. The U.V. spectrum displayed in FIG. 1A illustrates the spectrum of the pure trans isomer (designated 9401). The cis isomer leads to a photoproduct that has a strong absorption at 254 nm, and thus also shown are the resulting spectrum of the formed mixture of compounds after 5 minutes of irradiation (designated 9601), the resulting spectrum of the formed mixture of compounds after 8 minutes of irradiation (designated 9801) and the resulting spectrum of the formed mixture of compounds after 15 minutes of irradiation (designated 0301). FIG. 1B illustrates the spectrum of the residue after 18 hrs of irradiation.

example 2

[0046] Pure trans-stilbene dipropanol was dissolved in acetonitrile and irradiated with a mercury lamp having a Hg filter. The U.V. spectrum displayed in FIG. 2A illustrates the spectrum of the pure trans isomer (designated 4301), the resulting spectrum of the formed mixture of trans and cis isomers (having a strong absorption at 254 nm) after 2 minutes of irradiation (designated 4401), the resulting spectrum of the formed mixture of trans and cis isomers after 6 minutes of irradiation (designated 4501). The spectrum of the acetonitrlie is designated 4201. FIG. 2B illustrates the spectrum of the cis-stilbene dipropanol as in FIG. 2A, however after the abstraction of the acetonitrile spectrum.

example 3

[0047] trans-stilbene diethylacetate was dissolved in acetonitrile and irradiated with a mercury lamp having a Hg filter. The displayed U.V. spectrum (FIG. 3) illustrates the spectrum of the pure trans isomer (designated 5301), and the resulting spectrum of the formed residue (with the photoproduct arising from the cis-isomer having a strong absorption at 254 nm) after 22 hrs of irradiation (designated 5501)

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Abstract

The present invention is directed to a three-dimensional memory apparatus for storing information in a volume comprising of an active medium. The active medium is capable of changing from a first to a second isomeric form as a response to radiation of a light beam having an energy substantially equal to a first threshold energy. The concentration ratio between a first and a second isomeric form in any given volume portion represents a data unit. The active medium in the memory apparatus comprises of diarylalkene derivatives, triene derivatives, polyene derivatives or a mixture thereof. The invention is further directed to means for reading the data units from the isomeric states of the active medium in different portions of said active medium where the two isomeric forms have a substantially different absorption coefficient for absorbing energy of a second threshold energy. Reading may also be carried out by measuring the scattering pattern of the two isomeric forms.

Description

[0001] This application is a continuation in part of U.S. application Ser. No. 10 / 240,420 dated Mar. 28, 2001 and continuation in part of U.S. application Ser. No. 10 / 505,109 dated Feb. 20, 2003 wherein these two applications are incorporated herein by reference.FIELD OF THE INVENTION [0002] This invention relates to a 3-dimensional optical data storage and retrieval system. BACKGROUND OF THE INVENTION [0003] The following publications are referred to in the present description: [0004] 1) U.S. Pat. No. 5,592,462 [0005] 2) U.S. Pat. No. 5,268,862 [0006] The computerized era has raised the need to provide reliable means for storing large amounts of data. Ever-growing amounts of information are nowadays stored in personal and commercial computers, and with progress of technology, this demand will surely grow. One approach to fulfill such a need is to use optical methods for the storage of data, since an optical memory makes it feasible to pack information as binary digits at very high ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/00G01J3/44G11B3/70G11B7/26G11B7/24G11B5/84G03C1/73G11B7/241G11B7/004G11B7/0045G11B7/244
CPCB82Y10/00G11B7/00455Y10S430/146G11B7/244G11B7/245G11B7/24G11B7/127G11B2007/0009
Inventor ALPERT, ORTAL
Owner MEMPILE
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