Integrated Quantum Cascade Laser with Distributed Bragg Reflector
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Solution Overview
Problem
Integrated quantum cascade lasers with distributed Bragg reflectors face challenges in low power consumption and heat dissipation, particularly when attempting to use the flip-chip mounting method, which is difficult due to the complexity of mounting multiple lasers on a single substrate.
Innovation Solution
The design includes a laser structure with a distributed Bragg reflector and metal bumps for efficient electrical connection and heat dissipation, where the metal bumps in the first region are used to dissipate heat and protect the semiconductor mesas, while those in the third region facilitate external connection, and an air-bridge structure maintains electrical connection without deteriorating reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flip-chip mounting method is used to integrate multiple quantum cascade lasers on a single substrate, then the integration density and productivity are improved, but the device complexity and manufacturing precision deteriorate due to the complexity of mounting multiple lasers
Solution Approach 1:
The device is divided into distinct functional regions: a first region containing semiconductor mesas for laser emission, a second region containing the distributed Bragg reflector for optical feedback, and a third region containing metal layers and bump electrodes for electrical connection and heat dissipation. This segmentation allows each region to be optimized independently, simplifying the overall integration process while maintaining high integration density.
Solution Approach 2:
The metal layers in the third region serve multiple functions simultaneously: they provide electrical connection through bump electrodes to external circuits, act as heat dissipation paths for thermal management, and maintain structural integrity during mounting. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while improving productivity.
2Ease of operation
If metal layers are placed close to semiconductor mesas for electrical connection, then the ease of operation is improved, but the reliability deteriorates due to potential damage during mounting
Solution Approach 1:
The electrical connection is achieved by extending metal layers from the third region (远离半导体 mesas 的区域) back to the first region through the second region, creating a three-dimensional connection path. This spatial arrangement allows electrical connection without placing vulnerable metal layers directly adjacent to semiconductor mesas, thereby protecting them during mounting while maintaining electrical connectivity.
3Use of energy by moving object
If the distributed Bragg reflector is integrated into the laser structure, then the power consumption is reduced, but the heat dissipation becomes more difficult
Solution Approach 1:
The third region is specifically designed with metal layers optimized for heat dissipation, positioned away from the optical components. This localized thermal management design allows the distributed Bragg reflector to be integrated for low power consumption while the separate third region handles heat dissipation, preventing thermal interference with the optical function.
4Reliability
If multiple metal layers are used for electrical connection and heat dissipation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The metal layers in the third region are designed to perform multiple functions simultaneously: providing electrical connection paths through bump electrodes, serving as heat dissipation structures, and maintaining mechanical stability during mounting. By consolidating these functions into a single multi-functional metal layer structure, the patent reduces device complexity while maintaining high reliability.
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 configuration enables efficient power consumption and effective heat dissipation, allowing for the integration of multiple quantum cascade lasers on a single substrate while maintaining high reflectivity and preventing damage during the mounting process.
Implementation Method 1
a distribute Bragg reflector provided in the second region, the distribute Bragg reflector having one or more semiconductor walls
Implementation Method 2
the laminate including a core layer having a quantum well structure
Implementation Method 3
The first metal layer is electrically connected to the first semiconductor mesa. The second metal layer is electrically connected to the second semiconductor mesa
Implementation Method 4
the first and second metal layers being disposed on the third region, the third and fourth metal layers being disposed on the first region
Data Source
AI summary
An integrated quantum cascade laser includes: a laser structure including first to third regions arranged in a direction of a first axis, the laser structure including a substrate and a laminate including a core layer; first and second metal layers disposed on the third region; third and fourth metal layers disposed on the first region; first to fourth bump electrodes disposed on the first to fourth metal layers, respectively; first and second semiconductor mesas provided in the first region, each of the first and second semiconductor mesas including the core layer; and a distributed Bragg reflector provided in the second region, the distributed Bragg reflector having one or more semiconductor walls. The first and second metal layers are electrically connected to the first and second semiconductor mesas, respectively. The third and fourth metal layers are isolated from the first and second metal layers.