US 2013/0033975 A1Published application

Reversible recording medium based on optical storage of information, method of reversible recording on such a medium

AssigneeUniversite Damgers

InventorsDenis Gindre, Marc Salle, Oksana Krupka, Konstantinos Iliopoulos

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Abstract

A reversible recording medium based on optical storage of at least one item of information within a support material, includes at least one layer of support material having: base molecules able to take, in a local zone, a first collective state of molecules able to generate a first signal of second harmonic characteristic of this first collective state of molecules when excited by electromagnetic reading radiation; the base molecules having the first collective state of molecules able to transform, at least in part, into transformed molecules so as to pass to a second collective state of molecules when excited by electromagnetic writing radiation, the molecules having the second collective state of molecules able to generate a second signal of second harmonic characteristic of this second collective state of molecules when excited by the electromagnetic reading radiation. The molecules exhibit a molecular structure based on a coumarin skeleton of Formula (I).

Claims20

Dependent claims

Medium for reversible recording based on optical storage of at least one piece of information within a support material, with the recording medium comprising at least one layer of a support material comprising:

Base molecules (M) that can take on, in a local zone (9), a first collective state (EC1) of molecules (M, M′);
The molecules (M, M′) that have the first collective state (EC1) of molecules (M, M′) being able to generate a first second harmonic signal (SH1) that is characteristic of this first collective state (EC1) of molecules (M, M′) when they are excited by an electromagnetic reading radiation (10);
The base molecules (M) that have the first collective state (EC1) of molecules (M, M′) being able to be transformed, at least in part, into transformed molecules (M′) to pass into a second collective state (EC2) of molecules (M, M′) when they are excited by an electromagnetic writing radiation,
The molecules (M, M′) that have the second collective state (EC2) of molecules (M, M′) that are able to generate a second harmonic signal (SH2) that is characteristic of this second collective state (EC2) of molecules (M, M′) when they are excited by the electromagnetic reading radiation (10);
characterized in that the base molecules (M) have a molecular structure that is based on a coumarin skeleton of the type:
In which R1 corresponds to a site of attachment of the coumarin skeleton with a polymer matrix.

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Process for reversible recording on a recording medium based on optical storage of at least one piece of information within a layer of a support material that comprises multiple stages that consist in:

Making base molecules (M) take on a first collective state (EC1) of molecules (M, M′) in a local zone (9);
With the molecules (M, M′) having the first collective state (EC1) of molecules (M, M′) in the local zone (9) being able to generate a first second harmonic signal (SH1) that is characteristic of this first collective state (EC1) of molecules (M, M′) when they are excited by electromagnetic reading radiation (10);
Selectively applying electromagnetic writing radiation at the level of at least one writing zone of said local zone (9), in such a way as to transform a portion of the base molecules (M) having the first collective state (EC1) of molecules (M, M′) into transformed molecules (M′) thus making the molecules (M, M′) that have the first collective state (EC1) of molecules (M, M′) pass into a second collective state (EC1) of molecules (M, M′);
With the molecules (M, M′) having the second collective state (ECJ of molecules (M, M′) being able to generate a second second harmonic signal (SH2) that is characteristic of this second collective state (EC1) of molecules (M, M′) when they are excited by the electromagnetic reading radiation (10);
wherein the base molecules (M) have a molecular structure that is based on a coumarin skeleton of the type:
In which R1 corresponds to a site of attachment of the coumarin skeleton with a polymer matrix.

3 more elements

Dependencies are inferred from the claim text.