Nonlinear Optical Dye for Multicolor Holography

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Solution Overview

Problem

Conventional organic photorefractive materials using nonlinear optical dyes have low diffraction response speed and are limited to recording holographic images in red color due to specific absorption spectra, restricting their application in hologram recording media.

Innovation Solution

A nonlinear optical dye with a 4-nitropyridine N-oxide structure is developed, allowing for the creation of photorefractive substrates that can reconstruct holographic images in three primary colors (red, blue, and green) with high transmittance and diffraction efficiency, achieved by optimizing the dipole moment value and maximum absorption wavelength within the visible light range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional nonlinear optical dyes with specific absorption spectra are used, then the material can transmit certain wavelengths, but the holographic images can only be reconstructed in red color and the diffraction response speed is low

Engineering Contradiction:

Improvecolor reconstruction capabilityVSAvoiddiffraction response speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent applies parameter changes by modifying the molecular structure of the nonlinear optical dye to achieve a maximum absorption wavelength of 315-360 nm and dipole moment of 2.1 D or less. This structural parameter optimization enables the dye to transmit red, blue, and green light simultaneously while maintaining high diffraction response speed, resolving the contradiction between color versatility and response speed

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If nonlinear optical dyes with visible light absorption bands are used, then the material can transmit red light, but it cannot transmit blue and green light wavelengths

Engineering Contradiction:

Improvelight transmittanceVSAvoidwavelength transmission range

Core Design Contradiction:

Illumination intensityVSAdaptability or versatility

Solution Approach 1:

The patent changes the absorption wavelength parameter of the nonlinear optical dye to 315-360 nm, which is in the ultraviolet/near-visible range. This parameter change allows the dye to have high transmittance across the entire visible spectrum including red, blue, and green wavelengths, simultaneously improving both light transmittance and wavelength transmission range

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If organic photorefractive materials are used as substitutes for inorganic materials, then manufacturing cost is reduced and formability is improved, but diffraction response speed becomes low

Engineering Contradiction:

Improvemanufacturing cost and formabilityVSAvoiddiffraction response speed

Core Design Contradiction:

Ease of manufactureVSSpeed

Solution Approach 1:

The patent optimizes the dipole moment parameter of the nonlinear optical dye to 2.1 D or less, which is a critical parameter for enhancing diffraction response speed. This parameter optimization maintains the advantages of organic materials (low cost, good formability) while achieving high diffraction response speed comparable to or exceeding inorganic materials

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 new nonlinear optical dye enables photorefractive substrates with enhanced diffraction efficiency and response speed, enabling the reconstruction of holographic images in multiple colors and improving workability in hologram recording media.

Implementation Method 1

the 3-[(4-nitrophenyl)azo]-9H-carbazole-9-ethanol used as a nonlinear optical dye has an absorption band in the visible light region and can only transmit light of wavelengths near the red light in the visible light region

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

Photorefractive materials are materials in which, when two light beams are crossed on or in a photorefractive material, the refractive index varies in response to a spatial electric field caused by the interference of the light beams

Methodology Applied

Scientific EffectPhotorefractive effect: Photoelectric Effect

Implementation Method 3

The photorefractive materials can also be used as phase-conjugate mirrors because the diffracted light generated from the diffraction grating is phase-conjugate light

Methodology Applied

Scientific EffectDiffraction: Diffraction

Data Source

PatentUS9902858B2Nonlinear optical dye, photorefractive material composition, photorefractive substrate and hologram recording medium

Publication Date: 2018.02.27 TOYO KOHAN CO LTD

AI summary

A nonlinear optical dye includes a compound represented by the general formula (1) below.In the above general formula (1), each of X1, X2, X3 and X4 independently represents a hydrogen atom, an alkyl group having a carbon number of 1 to 6, a halogen atom, a hydroxyl group, a nitro group, a cyano group, or a methylsulfonyl group. In the present invention, it is preferred that each of X1, X2, X3 and X4 independently represents a hydrogen atom, an alkyl group having a carbon number of 1 to 6, or a halogen atom. In the present invention, it is also preferred that the nonlinear optical dye has a dipole moment of 2.1 D or less and a maximum absorption wavelength within a range of 315 to 360 nm.