Glass Microstructured Fiber Tip Assembly for Thermal Alignment Stability
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Solution Overview
Problem
Existing methods for assembling microstructured or nanostructured optical and photonic components on optical fibers face challenges such as poor adhesion, thermal instability, and misalignment due to thermal shrinkage, especially in high-temperature and vibrational environments, and existing adhesion layers are insufficiently robust.
Innovation Solution
A method involving a support made of vitreous material, assembled with the optical fiber using localized fusion, where the component is first formed on a photosensitive material transformed into glass through multi-photon photopolymerization, followed by thermal annealing to prevent shrinkage, and aligned with the fiber before assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two-photon polymerization is used to create high-resolution microstructures, then manufacturing precision is improved, but thermal stability deteriorates due to polymer material limitations
Solution Approach 1:
The patent transforms the material state from polymer to glass through controlled thermal treatment parameters. By heating the polymer microstructure to temperatures above its glass transition temperature and holding it for a specific duration, the material undergoes a parameter change that converts it into a thermally stable glassy state while preserving the high-resolution features created by two-photon polymerization.
Solution Approach 2:
The patent creates a composite structure where the original polymer material is transformed into a glass-polymer composite through partial vitrification. This composite material combines the high-resolution capability of polymer-based two-photon polymerization with the thermal stability of glass, achieving both fine feature resolution and thermal resistance.
2Loss of substance
If high-temperature heat treatment is applied to remove organic fraction, then purity is improved, but manufacturing precision deteriorates due to dimensional shrinkage
Solution Approach 1:
The patent performs preliminary dimensional compensation before the high-temperature heat treatment. By calculating the expected shrinkage based on the polymer-to-glass transformation and adjusting the initial 3D model dimensions accordingly, the final vitrified structure achieves the desired dimensional accuracy. This preliminary action prevents the need for post-processing adjustments.
Solution Approach 2:
The patent incorporates a cushioning factor in the design phase to compensate for the inevitable shrinkage during vitrification. The initial structure is designed with slightly larger dimensions that account for the expected contraction, ensuring that after heat treatment and organic fraction removal, the final dimensions match the target specifications.
3Strength
If adhesion layers are introduced to improve assembly strength, then strength is improved, but device complexity increases
Solution Approach 1:
The patent merges the adhesion function into the support structure itself by making the support and component from the same polymer material. This material unity creates inherent adhesion through molecular bonding when the materials are in contact, eliminating the need for separate adhesion layers. The merging of material types simplifies the overall device structure while maintaining strong assembly bonds.
Solution Approach 2:
The patent uses homogeneous polymer material for both the support structure and the microcomponent. This material homogeneity ensures compatible thermal expansion coefficients, similar processing requirements, and natural adhesion through molecular entanglement and bonding, eliminating the need for heterogeneous adhesion layers and reducing device complexity.
4Ease of manufacture
If friction-based attachment is used to assemble component on fiber, then ease of manufacture is improved, but reliability deteriorates in high-temperature and vibrational environments
Solution Approach 1:
The patent replaces the mechanical friction-based attachment system with a thermal-field-based bonding system. By using controlled heating during assembly, the polymer materials undergo localized melting and re-solidification, creating strong molecular bonds between the support and the optical fiber. This substitution of mechanical bonding with thermal-field bonding provides superior reliability in high-temperature and vibrational environments.
Solution Approach 2:
The patent utilizes phase transition of the polymer material from solid to molten state and back during the assembly process. By heating the polymer to its melting point, the material becomes fluid and can flow into the interface between the support and fiber, creating strong adhesion upon cooling. This phase transition mechanism provides reliable bonding that withstands environmental stresses better than friction-based attachment.
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
Ensures strong and precise attachment of the component to the fiber, maintaining alignment and optical properties, while avoiding post-assembly misalignment and deformation.
Implementation Method 1
produce on a first end of said support, by photopolymerization with several photons, in particular with two photons, a micro-structured or nano-structured component
Implementation Method 2
carry out one or more heat treatments so as to transform the first material of said support and the second material of said micro- or nano-structured component into a glassy material
Implementation Method 3
assemble and join, a region of a second end of said support opposite said first end with an area of an end or a lateral surface of said structure
Data Source
Figure 1~4
Figure 5A~5B
Figure 6~7
AI summary
The invention relates to a process for producing an optical device equipped with a nano-structured or micro-structured component (21) joined to one end of an optical fibre (30), the process comprising steps of: - providing a carrier (10) based on a photosensitive material (12) that is convertible into a vitreous material, and producing on one end (10A) of said carrier, by two-photon photopolymerization, a micro-structured or nano-structured component (21) based on a photosensitive material (22) that is convertible into a vitreous material; - carrying out one or more heat treatments so as to convert the material (12) of said carrier and the material (22) of said micro- or nano-structured component into vitreous material; subsequently, - joining and securing a region of a second end (10B) of said carrier (10), which end is opposite said first end (10A), to a zone of an end of the optical fibre (30), through localized fusion of said region and of said zone, of said carrier and of said optical fibre (30), respectively.