Passive Optical Alignment Using Nanomagnet Patterns
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Solution Overview
Problem
The alignment of optical components with waveguides, such as optical fibers, poses a challenge in the photonics industry due to the need for expensive active alignment equipment and slow fabrication processes, which limits throughput.
Innovation Solution
The use of deposited magnetic patterns to passively align optical components with optical devices on a semiconductor substrate, where complementary magnetic patterns on the component and substrate magnetically couple to align in multiple dimensions, providing a temporary holding force until secured with an adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If active alignment equipment with sub-micron resolution multi-stage axis system and integrated cameras is used to align optical components, then alignment precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent introduces magnetic patterns as an intermediary alignment mechanism. These patterns create magnetic fields that passively guide and hold optical components in their correct positions during assembly, eliminating the need for complex active alignment equipment with cameras and multi-stage axis systems. The magnetic field acts as a mediator that automatically establishes precise alignment through magnetic attraction and field interaction.
2Manufacturing precision
If active alignment with integrated cameras and monitoring systems is implemented, then alignment accuracy is improved, but productivity and fabrication throughput decrease
Solution Approach 1:
The magnetic alignment system enables self-service alignment where the optical components automatically position themselves through magnetic field interaction. The magnetic patterns on the substrate and component create inherent alignment forces that guide the component into its correct position without requiring external monitoring systems, active adjustment mechanisms, or time-consuming manual alignment procedures, thereby significantly improving fabrication throughput.
3Manufacturing precision
If expensive active alignment equipment with dedicated monitoring systems is used, then alignment quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive magnetic patterns deposited on the substrate and optical components as a low-cost alignment solution. These magnetic patterns are simple, easily fabricated structures that replace expensive, complex active alignment equipment. The magnetic field generation requires minimal additional manufacturing steps compared to the costly cameras, sensors, and precision mechanical systems that would otherwise be needed.
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 enables efficient and cost-effective passive alignment of optical components, reducing the need for expensive active alignment equipment and speeding up the fabrication process while maintaining high coupling efficiency.
Implementation Method 1
complementary magnetic patterns on the component and substrate magnetically couple to align in multiple dimensions
Implementation Method 2
providing a temporary holding force until secured with an adhesive
Data Source
AI summary
Embodiments herein include an optical system, an optical component, and an associated method of passive alignment in which complementary magnetic patterns are used to provide passive alignment between optical elements. The magnetic coupling between the magnetic patterns operates to align optical elements in at least two dimensions. The magnetic coupling provides a temporary holding force on the optical elements until the optical elements are secured using epoxy or other adhesive.