Patterned 3D Photonic Crystal Liquid Selective Infiltration
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Solution Overview
Problem
Existing photonic structures with uniform surface properties face challenges in selectively interacting with liquids, limiting their ability to dynamically change reflectance spectra and exhibit encrypted messages.
Innovation Solution
A porous three-dimensional photonic crystal with patterned surface regions, each functionalized with distinct groups that attract different liquids, allowing for selective infiltration and visible color changes, enabling the encoding of messages and differentiation of solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photonic structures have uniform surface properties, then manufacturing is simpler, but the ability to selectively interact with different liquids is limited
Solution Approach 1:
The patent applies local quality by functionalizing different regions of the photonic crystal with distinct surface properties (hydrophilic, hydrophobic, lyophobic, lyophilic groups) to enable selective liquid infiltration in specific areas, creating spatially differentiated interactions with various liquids
2Loss of information
If photonic structures have uniform surface properties, then device complexity is reduced, but encrypted message capability is lost
Solution Approach 1:
The patent encodes information by patterning specific regions with functional groups that respond to particular liquids, creating hidden messages that are revealed only when the corresponding liquid infiltrates those specific regions, thereby converting spatial patterns into information carriers
3Adaptability or versatility
If photonic structures have uniform surface properties, then manufacturing precision requirements are lower, but reflectance spectrum dynamic manipulation is limited
Solution Approach 1:
The patent enables dynamic reflectance spectrum manipulation by creating local regions with different surface energies that selectively attract or repel liquids, causing spatially varying refractive index changes that dynamically tune the overall reflectance spectrum based on liquid infiltration patterns
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 structure effectively changes its reflectance spectrum upon liquid infiltration, allowing for encrypted message revelation and solvent identification, enhancing optical response and functional versatility.
Implementation Method 1
the first functional group attracts a first liquid differently than the second functional group
Implementation Method 2
Three dimensional (3D) photonic crystals (PCs), materials with a 3D-periodic variation in refractive index, have been the subject of extensivescientific interest
Implementation Method 3
Infiltration and inversion of porous 3D photonic crystals with materials that are capable of dynamic actuation has produced a broad class of PCs with structural colors that can be dynamically manipulated
Data Source
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AI summary
A three-dimensional porous photonic structure, whose internal pore surfaces can be provided with desired surface properties in a spatially selective manner with arbitrary patterns, and methods for making the same are described. When exposed to a fluid (e.g., via immersion or wicking), the fluid can selectively penetrate the regions of the structure with compatible surface properties. Broad applications, for example in security, encryption and document authentication, as well as in areas such as simple microfluidics and diagnostics, are anticipated.