Quantum Cascade Laser Heat Dissipation via Metal Embedding
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Solution Overview
Problem
Existing quantum-cascade laser elements face challenges in stabilizing light output by suppressing high-order mode oscillation and improving heat dissipation, which affects the stability and efficiency of the laser element.
Innovation Solution
A quantum-cascade laser element design featuring a semiconductor substrate with a ridge portion, an embedding layer with specific side and edge portions, and a metal layer on the top surface and side portions, along with a dielectric layer between the metal and embedding layer, enhances heat dissipation and suppresses high-order mode oscillation while improving bond strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the metal layer is formed only on the top surface of the ridge portion, then the manufacturing process is simple, but the heat dissipation is insufficient and high-order mode oscillation cannot be suppressed
Solution Approach 1:
The metal layer is extended from the top surface of the ridge portion to the side surfaces, utilizing the vertical dimension to improve heat dissipation. This dimensional extension allows the metal layer to contact the embedding layer on side surfaces, creating additional heat dissipation pathways without significantly increasing manufacturing complexity
Solution Approach 2:
The embedding layer is divided into a ridge portion and side portions, with the metal layer selectively formed on different surfaces. This segmentation allows the metal layer to serve multiple functions: suppressing high-order modes on the top surface and dissipating heat on the side surfaces
2Temperature
If the metal layer directly contacts the embedding layer on side surfaces, then heat dissipation is improved, but bond strength is insufficient causing peeling and degradation
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the metal layer and the embedding layer on the side surfaces. This dielectric layer provides strong bonding between the metal and embedding layer while allowing thermal conduction, thus maintaining heat dissipation effectiveness while preventing peeling and degradation
Solution Approach 2:
The structure utilizes a composite arrangement of metal layer, dielectric layer, and embedding layer on the side surfaces. This composite structure combines the thermal conductivity of metal with the bonding strength of dielectric material, achieving both heat dissipation and structural reliability
3Stability of the object's composition
If the metal layer is extended to side surfaces, then high-order mode oscillation is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The side portions of the embedding layer serve multiple functions: they provide a platform for the metal layer to suppress high-order modes, facilitate heat dissipation, and offer bonding surfaces for the dielectric layer. This multi-functionality reduces the need for additional specialized structures that would increase manufacturing precision requirements
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
The design effectively improves heat dissipation, suppresses high-order mode oscillation, and enhances the stability of the laser element by ensuring better contact and bonding between the metal and embedding layers, leading to improved light output characteristics.
Implementation Method 1
heat generated in the active layer can be effectively dissipated
Implementation Method 2
bond strength between the metal layer and the embedding layer can be improved
Data Source
AI summary
A quantum-cascade laser element includes: a semiconductor substrate; a semiconductor laminate formed on the semiconductor substrate to include a ridge portion configured to include an active layer having a quantum-cascade structure; an embedding layer including a first portion formed on a side surface of the ridge portion, and a second portion extending from an edge portion of the first portion on a side of the semiconductor substrate along a width direction of the semiconductor substrate; a metal layer formed on a top surface of the ridge portion, on the first portion, and on the second portion; and a dielectric layer disposed between the second portion and the metal layer. The dielectric layer is formed such that a part of the second portion is exposed from the dielectric layer. The metal layer is in contact with the second portion at the part.