Crystalline Colloidal Array Film Diffracting Visible and Infrared Radiation
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Solution Overview
Problem
Current radiation diffractive materials based on crystalline colloidal arrays are limited in their ability to simultaneously diffract both visible and infrared radiation effectively, often requiring separate structures or methods for each spectral range.
Innovation Solution
A radiation diffractive film with an ordered periodic array of particles in a polymeric matrix, where the array includes both first crystal planes that diffract infrared radiation and second crystal planes that diffract visible radiation, achieving diffraction according to Bragg's law by controlling the interplanar distances and refractive index contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single crystalline colloidal array structure is used, then the device complexity is reduced, but the ability to simultaneously diffract both visible and infrared radiation is limited
Solution Approach 1:
The crystalline colloidal array is segmented into distinct crystal planes with different interplanar spacings. First crystal planes have spacings optimized for infrared diffraction while second crystal planes have spacings optimized for visible light diffraction. This segmentation allows a single structure to handle multiple spectral ranges by directing different wavelengths to different planes for diffraction.
Solution Approach 2:
Different regions of the crystalline structure are assigned different local properties - specifically, different interplanar spacings in different crystal planes. The first crystal planes are configured with spacings suitable for infrared wavelengths while second crystal planes have spacings matched to visible wavelengths, allowing each plane to optimally diffract its target wavelength range.
2Reliability
If separate structures are used for visible and infrared diffraction, then the diffraction effectiveness for each spectral range is improved, but the device complexity increases
Solution Approach 1:
Two separate diffraction functions (visible and infrared) are merged into a single crystalline colloidal array structure. The array contains both first crystal planes for infrared diffraction and second crystal planes for visible diffraction, combining multiple spectral handling capabilities in one integrated device rather than requiring separate structures.
Solution Approach 2:
The crystalline colloidal array is designed as a universal structure that performs multiple diffraction functions simultaneously. It can diffract both visible and infrared radiation through its multiple crystal planes, making a single device applicable to multiple spectral ranges that would otherwise require different specialized structures.
3Measurement precision
If the interplanar spacing is optimized for one wavelength range, then the diffraction precision for that range is improved, but the ability to diffract other wavelength ranges deteriorates
Solution Approach 1:
The diffraction function is segmented across multiple crystal planes, each with spacings optimized for specific wavelength ranges. First crystal planes are segmented for infrared precision while second crystal planes are segmented for visible precision, allowing high precision in each range without compromising the other.
Solution Approach 2:
Different crystal planes are assigned different local spacing qualities matched to their target wavelengths. The first crystal planes have local spacing properties optimized for infrared wavelengths while second crystal planes have local spacing properties optimized for visible wavelengths, enabling precise diffraction in each spectral range simultaneously.
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 film effectively diffracts both infrared and visible radiation, providing a goniochromatic effect that can be used for anti-counterfeiting devices and other applications by varying the wavelength of reflected radiation with the viewing angle, enhancing security features and optical properties.
Implementation Method 1
the structures diffract radiation according to Bragg's law, wherein the radiation meeting the Bragg conditions is reflected while adjacent spectral regions that do not meet the Bragg conditions are transmitted through the device
Implementation Method 2
A crystalline colloidal array (CCA) is a three-dimensional ordered array of mono-dispersed colloidal particles. The particles are typically composed of a polymer, such as polystyrene. These colloidal dispersions of particles can self-assemble into ordered arrays (crystalline structures)
Data Source
AI summary
A radiation diffractive film is disclosed, which includes a viewing surface, with at least a portion of the viewing surface residing in a viewing plane. The film comprises an ordered periodic array of particles received in a matrix material, the array of particles having a crystalline structure, wherein the crystalline structure defines (i) a plurality of first crystal planes of the particles that diffract infrared radiation and (ii) a plurality of second crystal planes of the particles that diffract visible radiation.