Self-aligning Ridge Features for III-V Laser and Photonics Chip Bonding
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Solution Overview
Problem
Existing methods for assembling flip-chip package structures, such as lithographically defined mechanical stops and solder reflow, are ineffective in accurately aligning components due to fabrication and assembly process tolerances, leading to misalignment of assembled components.
Innovation Solution
The method involves using a laser chip with ridge structures that provide alignment features, allowing a Type IV photonics chip to be vertically and laterally aligned within an alignment cavity or recess, and bonded using separate solder connections, leveraging surface tension during solder reflow for precise three-dimensional alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lithographically defined mechanical stops and solder reflow are used for alignment, then the assembly process is simple and manufacturable, but the alignment precision deteriorates due to fabrication and assembly process tolerances
Solution Approach 1:
The laser chip's ridge structure serves as a self-aligning feature that automatically guides the Type IV photonics chip into precise alignment during assembly. The ridge structure acts as a mechanical reference that compensates for tolerances in both the laser chip and photonics chip fabrication, enabling high-precision alignment without requiring complex external alignment mechanisms or tight tolerance control in manufacturing
Solution Approach 2:
The ridge structure functions as an intermediary alignment element between the laser chip and the Type IV photonics chip. This intermediate feature translates the relatively loose mechanical tolerances of standard fabrication processes into precise final alignment, mediating between the ease of manufacture and the need for high alignment precision
2Device complexity
If mechanical stops and solder reflow techniques are used, then the device complexity is low, but the alignment accuracy deteriorates resulting in misaligned components
Solution Approach 1:
The ridge structure on the laser chip provides self-aligning capabilities that eliminate the need for complex external alignment mechanisms. The simple geometric feature of the ridge automatically establishes precise positional and angular relationships during assembly, achieving high alignment accuracy with minimal added device complexity
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 approach enables high-accuracy three-dimensional alignment of package components, eliminating the need for tolerance requirements in laser manufacturing and ensuring precise engagement between the laser and photonics chips, enhancing the reliability of flip-chip assembly.
Implementation Method 1
bonding a type IV photonics chip to the laser chip by solder connection to bonding pads that are separate from the alignment features of the laser chip
Data Source
AI summary
A method of forming a laser including device is provided that in one embodiment includes providing a laser chip including at least one ridge structure that provides an alignment features. The method further includes bonding a type IV photonics chip to the laser chip, wherein a vertical alignment feature from the type IV photonics chip is inserted in a recess relative to the at least one ridge structure that provides the alignment features of the laser structure.