Polymer Photonic Modulator Fabrication with Solvent Blocking Layers
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Solution Overview
Problem
Multi-level polymer-based photonic devices face challenges in solvent attack during deposition and baking processes, leading to cracking and delamination, which diminishes or renders the devices useless.
Innovation Solution
The process involves forming a series of blocking layers between polymer cladding and core layers to prevent solvent attack, using a platform with a dielectric or insulating material, depositing and patterning a ground electrode, and etching vias to fill with conductive material, ensuring electrical communication and protecting against solvent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer layers are deposited by spin coating or similar solution processes, then the fabrication process is simple and efficient, but solvent attack occurs during coating and baking causing cracking and delamination
Solution Approach 1:
A blocking layer is introduced as an intermediary between the core polymer layer and the cladding polymer layer. This blocking layer prevents solvent from the cladding layer solution from attacking the core layer during deposition and baking processes, thereby eliminating cracking and delamination while maintaining the simplicity of solution-based fabrication
Solution Approach 2:
The fabrication process is segmented into distinct stages with the blocking layer serving as a separation between layers deposited at different times. The blocking layer is deposited after the core layer, patterns are formed, then the cladding layer is deposited on top of the blocking layer, allowing independent optimization of each layer's deposition parameters
2Adaptability or versatility
If multiple polymer layers are deposited sequentially, then multi-level photonic devices can be fabricated, but solvent from subsequent layers attacks previously deposited layers causing delamination
Solution Approach 1:
The blocking layer acts as a protective intermediary that allows sequential deposition of multiple polymer layers with different solvents. It prevents the solvent from subsequent layers from penetrating and attacking previously deposited layers, maintaining layer adhesion stability throughout the multi-step fabrication process
Solution Approach 2:
The blocking layer is strategically positioned only where needed - between the core layer and cladding layer - providing localized protection against solvent attack. The blocking layer can be patterned to provide protection only in specific regions where solvent attack would occur
3Reliability
If solvents attack polymer layers during baking, then the photonic device operation is diminished or rendered useless, but avoiding solution-based deposition limits fabrication options
Solution Approach 1:
The blocking layer serves as a thermal and chemical barrier during the baking process, preventing solvent vapor from subsequent layers from attacking previously deposited layers. This allows the use of solution-based deposition methods with flexible fabrication options while ensuring device functionality is not compromised by solvent damage
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
This method effectively prevents solvent-induced damage, allowing for the reliable fabrication of multi-layer polymer photonic devices like modulators by using blocking layers to shield against solvent attacks during coating and baking, thereby enhancing device stability and functionality.
Implementation Method 1
A blocking layer is deposited on the core layer. A cladding layer of polymer material is deposited on the blocking layer... prevents solvent attacking of previous and following layers of material
Implementation Method 2
spin coating a layer of formulated solution containing a selected polymer and baking the layer
Implementation Method 3
baking the layer
Implementation Method 4
The vias are used to etch ground openings through the top polymer cladding layer, the second blocking layer, the core layer, the first blocking layer, and the bottom cladding layer
Data Source
AI summary
A method of fabricating polymer modulators includes forming an insulating layer on a platform and depositing and patterning a ground electrode on the insulating layer. A bottom polymer cladding layer, a first blocking layer, a polymer core layer, a second blocking layer, and a top polymer cladding layer are deposited in order. A third blocking layer is deposited on the top cladding layer and patterned to define vias which are used to etch ground openings through the top polymer cladding layer, the second blocking layer, the core layer, the first blocking layer, and the bottom cladding layer to the ground electrode. The openings are filled with electrically conductive material from electrical communication with the ground electrode to a surface of the top polymer cladding layer. The third blocking layer is removed and electrical contacts are formed on the top polymer cladding layer in electrical communication with the electrically conductive material.