Optical Recording Medium Multi-One Photon Absorption Layer

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Multi-photon absorption compounds used in optical information recording media have low light absorption efficiency and recording sensitivity, leading to decreased recording speed and layer selectivity.

Innovation Solution

An optical information recording medium comprising a recording layer with both multi-photon absorption and one-photon absorption compounds, where the absorption of multiple photons by the multi-photon compound and one photon by the one-photon compound generates voids for information recording, improving sensitivity and layer selectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If multi-photon absorption compounds are used in the recording layer, then layer selectivity is improved, but recording sensitivity is deteriorated

Engineering Contradiction:

Improvelayer selectivityVSAvoidrecording sensitivity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent combines multi-photon absorption compounds and one-photon absorption compounds into a single recording layer. The multi-photon absorption compound provides layer selectivity by reacting only at the focal point, while the one-photon absorption compound enhances recording sensitivity by absorbing light at lower intensities. This merging of two different absorption mechanisms resolves the contradiction between layer selectivity and recording sensitivity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The recording layer uses a composite material system containing both multi-photon absorption compounds and one-photon absorption compounds. This composite approach allows the material to exhibit both multi-photon absorption (for depth selectivity) and one-photon absorption (for high sensitivity) characteristics simultaneously, thereby resolving the trade-off between these two performance parameters.

Inventive Principle:

Principle #40Composite materials

2Reliability

If one-photon absorption materials are used in the recording layer, then recording sensitivity is improved, but layer selectivity is deteriorated

Engineering Contradiction:

Improverecording sensitivityVSAvoidlayer selectivity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent merges one-photon absorption compounds with multi-photon absorption compounds in the same recording layer. The one-photon absorption compound provides high recording sensitivity, while the multi-photon absorption compound ensures layer selectivity by requiring high light intensity only at the focal point. This combination resolves the contradiction by having each component fulfill its specialized function.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies local quality by having different absorption mechanisms operate in different contexts within the same layer. The one-photon absorption compound operates efficiently at lower intensities throughout the layer, while the multi-photon absorption compound activates only at the high-intensity focal point. This spatial differentiation of absorption mechanisms resolves the contradiction between sensitivity and selectivity.

Inventive Principle:

Principle #3Local quality

3Quantity of substance

If recording layers are laminated into a multi-layered structure, then recording capacity is improved, but beam loss is increased

Engineering Contradiction:

Improverecording capacityVSAvoidbeam loss

Core Design Contradiction:

Quantity of substanceVSLoss of energy

Solution Approach 1:

The patent changes the optical absorption parameters of the recording layer by incorporating both multi-photon and one-photon absorption compounds. This parameter change allows the layer to absorb light more efficiently at the focal point while maintaining higher transparency at other depths, thereby reducing beam loss in multi-layered structures and enabling higher recording capacity.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The combination of multi-photon and one-photon absorption compounds enhances recording sensitivity and layer selectivity, increasing recording speed and reducing beam loss, while allowing for high-capacity multi-layered recording and erasable information.

Implementation Method 1

absorption of multiple photons by the multi-photon absorption compound

Methodology Applied

Scientific EffectMulti-photon absorption: Absorption (EM radiation)

Implementation Method 2

absorption of one photon by the one-photon absorption compound

Methodology Applied

Scientific EffectOne-photon absorption: Absorption (EM radiation)

Implementation Method 3

absorption of multiple photons by the multi-photon absorption compound and absorption of one photon by the one-photon absorption compound cause a void to be generated

Methodology Applied

Scientific EffectVoid generation through absorption: Absorption (EM radiation)

Data Source

PatentUS8670296B2Optical information recording medium and optical information recording method

Publication Date: 2014.03.11 FUJIFILM CORP

AI summary

An optical information recording medium includes: a recording layer 12 comprising a multi-photon absorption compound and a one-photon absorption compound; and a supporting member (base layer 11) configured to support the recording layer 12. In this optical information recording medium, absorption of multiple photons by the multi-photon absorption compound and absorption of one photon by the one-photon absorption compound cause a void to be generated in the recording layer, whereby information is recordable by modulation based on a presence or absence of a void.